Merge UDP fastboot support from AOSP:

  
https://android.googlesource.com/platform/external/u-boot/+/android-o-mr1-iot-preview-8

Signed-off-by: Alex Kiernan <alex.kier...@gmail.com>
Signed-off-by: Alex Deymo <de...@google.com>
Signed-off-by: Jocelyn Bohr <b...@google.com>
---

Changes in v3:
- use FASTBOOT as our guard in Kconfig not a list of USB || UDP
- correct mis-translation from AOSP introduced when cleaning up for
  checkpatch - we should write when buffer is not NULL, rather than
  erasing, and erase when buffer is NULL
- use CMD_RET_USAGE from do_fastboot
- remove do_fastboot_udp from cmd/net.c and rewrite using net_loop()
- rename timed_send_info to fastboot_send_info, rename fastboot_send_info to
  fastboot_udp_send_info
- replace FASTBOOT_HEADER_SIZE with sizeof(struct fastboot_header)
- move start time into timed_send_info() rather than passing it in
- make calls to fastboot_udp_send_info a runtime dependency, not a compile
  time one
- set ${filesize} to size of downloaded image
- add progress meter from USB path during download
- add support for 'oem format' command from the USB path
- rename 'fastbootcmd' to 'fastboot_bootcmd' to make clear that this is the
  fastboot boot command
- make getvar implementation table driven
- add fastboot_buf_addr, fastboot_buf_size to override buffer address and
  size
- return correct filesystem type in getvar partition-type on MMC
- process "fastboot." prefixed env variables in getvar first so you
  can override the normal values (this also lets you set a fs type for
  NAND devices)
- squash subsequent patches which change this code into this one:
  - If the fastboot flash/erase commands are disabled, remove that support
    so we still build correctly.
  - Add NAND support to fastboot UDP flash/erase commands
  - If we don't have a partition name passed, report it as not found.
  - Change the behaviour of the fastboot net code such that
    "reboot-bootloader" is no longer written to CONFIG_FASTBOOT_BUF_ADDR for
    use as a marker on reboot (the AOSP code in common/android-bootloader.c
    uses this marker - this code could be reinstated there if that gets
    merged).
  - Merge USB and UDP boot code. The USB implementation stays the same, but
    UDP no longer passes an fdt. We introduce a new environment variable
    'fastboot_bootcmd' which if set overrides the hardcoded boot command,
    setting this then allows the UDP implementation to remain the same. If
    after running 'fastboot_bootcmd' the board has not booted, control is
    returned to U-Boot and the fastboot process ends.
  - Separate the fastboot protocol handling from the fastboot UDP code in
    preparation for reusing it in the USB code.

Changes in v2:
- ensure fastboot syntax is backward compatible - 'fastboot 0' means
  'fastboot usb 0'

 cmd/fastboot.c                |  91 ++++++++++++-
 drivers/fastboot/Kconfig      |  15 ++
 drivers/fastboot/Makefile     |   2 +
 drivers/fastboot/fb_command.c | 258 +++++++++++++++++++++++++++++++++++
 drivers/fastboot/fb_common.c  |  48 +++++++
 drivers/fastboot/fb_getvar.c  | 222 ++++++++++++++++++++++++++++++
 drivers/fastboot/fb_mmc.c     |  67 ++++++++-
 drivers/fastboot/fb_nand.c    |  12 +-
 include/fastboot.h            |  47 +++++++
 include/fb_mmc.h              |   8 +-
 include/fb_nand.h             |  10 +-
 include/net.h                 |   2 +-
 include/net/fastboot.h        |  21 +++
 net/Makefile                  |   1 +
 net/fastboot.c                | 310 ++++++++++++++++++++++++++++++++++++++++++
 net/net.c                     |   7 +
 16 files changed, 1105 insertions(+), 16 deletions(-)
 create mode 100644 drivers/fastboot/fb_command.c
 create mode 100644 drivers/fastboot/fb_getvar.c
 create mode 100644 include/net/fastboot.h
 create mode 100644 net/fastboot.c

diff --git a/cmd/fastboot.c b/cmd/fastboot.c
index a5ec5f4..557257a 100644
--- a/cmd/fastboot.c
+++ b/cmd/fastboot.c
@@ -10,10 +10,32 @@
 #include <command.h>
 #include <console.h>
 #include <g_dnl.h>
+#include <fastboot.h>
+#include <net.h>
 #include <usb.h>
 
-static int do_fastboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const 
argv[])
+static int do_fastboot_udp(int argc, char *const argv[],
+                          uintptr_t buf_addr, size_t buf_size)
 {
+#if CONFIG_IS_ENABLED(UDP_FUNCTION_FASTBOOT)
+       int err = net_loop(FASTBOOT);
+
+       if (err < 0) {
+               printf("fastboot udp error: %d\n", err);
+               return CMD_RET_FAILURE;
+       }
+
+       return CMD_RET_SUCCESS;
+#else
+       pr_err("Fastboot UDP not enabled\n");
+       return CMD_RET_FAILURE;
+#endif
+}
+
+static int do_fastboot_usb(int argc, char *const argv[],
+                          uintptr_t buf_addr, size_t buf_size)
+{
+#if CONFIG_IS_ENABLED(USB_FUNCTION_FASTBOOT)
        int controller_index;
        char *usb_controller;
        int ret;
@@ -58,11 +80,70 @@ exit:
        board_usb_cleanup(controller_index, USB_INIT_DEVICE);
 
        return ret;
+#else
+       pr_err("Fastboot USB not enabled\n");
+       return CMD_RET_FAILURE;
+#endif
+}
+
+static int do_fastboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const 
argv[])
+{
+       uintptr_t buf_addr = (uintptr_t)NULL;
+       size_t buf_size = 0;
+
+       if (argc < 2)
+               return CMD_RET_USAGE;
+
+       while (argc > 1 && **(argv + 1) == '-') {
+               char *arg = *++argv;
+
+               --argc;
+               while (*++arg) {
+                       switch (*arg) {
+                       case 'l':
+                               if (--argc <= 0)
+                                       return CMD_RET_USAGE;
+                               buf_addr = simple_strtoul(*++argv, NULL, 16);
+                               goto NXTARG;
+
+                       case 's':
+                               if (--argc <= 0)
+                                       return CMD_RET_USAGE;
+                               buf_size = simple_strtoul(*++argv, NULL, 16);
+                               goto NXTARG;
+
+                       default:
+                               return CMD_RET_USAGE;
+                       }
+               }
+NXTARG:
+               ;
+       }
+
+       fastboot_init((void *)buf_addr, buf_size);
+
+       if (!strcmp(argv[1], "udp"))
+               return do_fastboot_udp(argc, argv, buf_addr, buf_size);
+
+       if (!strcmp(argv[1], "usb")) {
+               argv++;
+               argc--;
+       }
+
+       return do_fastboot_usb(argc, argv, buf_addr, buf_size);
 }
 
+#ifdef CONFIG_SYS_LONGHELP
+static char fastboot_help_text[] =
+       "[-l addr] [-s size] usb <controller> | udp\n"
+       "\taddr - address of buffer used during data transfers ("
+       __stringify(CONFIG_FASTBOOT_BUF_ADDR) ")\n"
+       "\tsize - size of buffer used during data transfers ("
+       __stringify(CONFIG_FASTBOOT_BUF_SIZE) ")"
+       ;
+#endif
+
 U_BOOT_CMD(
-       fastboot, 2, 1, do_fastboot,
-       "use USB Fastboot protocol",
-       "<USB_controller>\n"
-       "    - run as a fastboot usb device"
+       fastboot, CONFIG_SYS_MAXARGS, 1, do_fastboot,
+       "run as a fastboot usb or udp device", fastboot_help_text
 );
diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index 51c5789..a79f456 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -14,6 +14,13 @@ config USB_FUNCTION_FASTBOOT
        help
          This enables the USB part of the fastboot gadget.
 
+config UDP_FUNCTION_FASTBOOT
+       depends on NET
+       select FASTBOOT
+       bool "Enable fastboot protocol over UDP"
+       help
+         This enables the fastboot protocol over UDP.
+
 if FASTBOOT
 
 config FASTBOOT_BUF_ADDR
@@ -118,6 +125,14 @@ config FASTBOOT_MBR_NAME
          specified on the "fastboot flash" command line matches the value
          defined here. The default target name for updating MBR is "mbr".
 
+config FASTBOOT_CMD_OEM_FORMAT
+       bool "Enable the 'oem format' command"
+       depends on FASTBOOT_FLASH_MMC && CMD_GPT
+       help
+         Add support for the "oem format" command from a client. This
+         relies on the env variable partitions to contain the list of
+         partitions as required by the gpt command.
+
 endif # FASTBOOT
 
 endmenu
diff --git a/drivers/fastboot/Makefile b/drivers/fastboot/Makefile
index e4bd389..149bd02 100644
--- a/drivers/fastboot/Makefile
+++ b/drivers/fastboot/Makefile
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier:      GPL-2.0+
 
 obj-y += fb_common.o
+obj-y += fb_getvar.o
+obj-y += fb_command.o
 
 obj-$(CONFIG_FASTBOOT_FLASH_MMC) += fb_mmc.o
 obj-$(CONFIG_FASTBOOT_FLASH_NAND) += fb_nand.o
diff --git a/drivers/fastboot/fb_command.c b/drivers/fastboot/fb_command.c
new file mode 100644
index 0000000..34bf9a2
--- /dev/null
+++ b/drivers/fastboot/fb_command.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ */
+
+#include <common.h>
+#include <fastboot.h>
+#include <fb_mmc.h>
+#include <fb_nand.h>
+#include <part.h>
+#include <stdlib.h>
+
+/* Fastboot download parameters */
+static u32 image_size;
+u32 fastboot_bytes_received;
+u32 fastboot_bytes_expected;
+
+static void fb_okay(char *, char *);
+static void fb_getvar(char *, char *);
+static void fb_download(char *, char *);
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+static void fb_flash(char *, char *);
+static void fb_erase(char *, char *);
+#endif
+static void fb_reboot_bootloader(char *, char *);
+#if CONFIG_IS_ENABLED(FASTBOOT_CMD_OEM_FORMAT)
+static void fb_oem_format(char *, char *);
+#endif
+
+static const struct {
+       const char *command;
+       void (*dispatch)(char *cmd_parameter, char *response);
+} fb_commands[FASTBOOT_COMMAND_COUNT] = {
+       [FASTBOOT_COMMAND_GETVAR] = {
+               .command = "getvar",
+               .dispatch = fb_getvar
+       },
+       [FASTBOOT_COMMAND_DOWNLOAD] = {
+               .command = "download",
+               .dispatch = fb_download
+       },
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+       [FASTBOOT_COMMAND_FLASH] =  {
+               .command = "flash",
+               .dispatch = fb_flash
+       },
+       [FASTBOOT_COMMAND_ERASE] =  {
+               .command = "erase",
+               .dispatch = fb_erase
+       },
+#endif
+       [FASTBOOT_COMMAND_BOOT] =  {
+               .command = "boot",
+               .dispatch = fb_okay
+       },
+       [FASTBOOT_COMMAND_CONTINUE] =  {
+               .command = "continue",
+               .dispatch = fb_okay
+       },
+       [FASTBOOT_COMMAND_REBOOT] =  {
+               .command = "reboot",
+               .dispatch = fb_okay
+       },
+       [FASTBOOT_COMMAND_REBOOT_BOOTLOADER] =  {
+               .command = "reboot-bootloader",
+               .dispatch = fb_reboot_bootloader
+       },
+       [FASTBOOT_COMMAND_SET_ACTIVE] =  {
+               .command = "set_active",
+               .dispatch = fb_okay
+       },
+#if CONFIG_IS_ENABLED(FASTBOOT_CMD_OEM_FORMAT)
+       [FASTBOOT_COMMAND_OEM_FORMAT] = {
+               .command = "oem format",
+               .dispatch = fb_oem_format,
+       },
+#endif
+};
+
+int fastboot_handle_command(char *cmd_string, char *response)
+{
+       int i;
+       char *cmd_parameter;
+
+       cmd_parameter = cmd_string;
+       strsep(&cmd_parameter, ":");
+
+       for (i = 0; i < FASTBOOT_COMMAND_COUNT; i++) {
+               if (!strcmp(fb_commands[i].command, cmd_string)) {
+                       if (fb_commands[i].dispatch) {
+                               fb_commands[i].dispatch(cmd_parameter,
+                                                       response);
+                               return i;
+                       } else {
+                               break;
+                       }
+               }
+       }
+
+       pr_err("command %s not recognized.\n", cmd_string);
+       fastboot_fail("unrecognized command", response);
+       return -1;
+}
+
+static void fb_okay(char *cmd_parameter, char *response)
+{
+       fastboot_okay(NULL, response);
+}
+
+static void fb_getvar(char *cmd_parameter, char *response)
+{
+       fastboot_getvar(cmd_parameter, response);
+}
+
+static void fb_download(char *cmd_parameter, char *response)
+{
+       char *tmp;
+
+       if (!cmd_parameter) {
+               fastboot_fail("Expected command parameter", response);
+               return;
+       }
+       fastboot_bytes_received = 0;
+       fastboot_bytes_expected = simple_strtoul(cmd_parameter, &tmp, 16);
+       if (fastboot_bytes_expected == 0) {
+               fastboot_fail("Expected nonzero image size", response);
+               return;
+       }
+       /*
+        * Nothing to download yet. Response is of the form:
+        * [DATA|FAIL]$cmd_parameter
+        *
+        * where cmd_parameter is an 8 digit hexadecimal number
+        */
+       if (fastboot_bytes_expected > fastboot_buf_size) {
+               fastboot_fail(cmd_parameter, response);
+       } else {
+               printf("Starting download of %d bytes\n",
+                      fastboot_bytes_expected);
+               fastboot_response("DATA", response, "%s", cmd_parameter);
+       }
+}
+
+/**
+ * Copies image data from fastboot_data to fastboot_buf_addr.
+ * Writes to response.
+ *
+ * @param fastboot_data        Pointer to received fastboot data
+ * @param fastboot_data_len    Length of received fastboot data
+ * @param response             Pointer to fastboot response buffer
+ */
+void fastboot_download_data(const void *fastboot_data,
+                           unsigned int fastboot_data_len,
+                           char *response)
+{
+       if (fastboot_data_len == 0 &&
+           fastboot_bytes_received >= fastboot_bytes_expected) {
+               /* Download complete. Respond with "OKAY" */
+               fastboot_okay(NULL, response);
+               printf("\ndownloading of %d bytes finished\n",
+                      fastboot_bytes_received);
+               image_size = fastboot_bytes_received;
+               env_set_hex("filesize", image_size);
+               fastboot_bytes_expected = 0;
+               fastboot_bytes_received = 0;
+       } else {
+#define BYTES_PER_DOT  0x20000
+               u32 pre_dot_num, now_dot_num;
+
+               if (fastboot_data_len == 0 ||
+                   (fastboot_bytes_received + fastboot_data_len) >
+                   fastboot_bytes_expected) {
+                       fastboot_fail("Received invalid data length",
+                                     response);
+                       return;
+               }
+               /* Download data to fastboot_buf_addr */
+               memcpy(fastboot_buf_addr + fastboot_bytes_received,
+                      fastboot_data, fastboot_data_len);
+
+               pre_dot_num = fastboot_bytes_received / BYTES_PER_DOT;
+               fastboot_bytes_received += fastboot_data_len;
+               now_dot_num = fastboot_bytes_received / BYTES_PER_DOT;
+
+               if (pre_dot_num != now_dot_num) {
+                       putc('.');
+                       if (!(now_dot_num % 74))
+                               putc('\n');
+               }
+       }
+}
+
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+/**
+ * Writes the previously downloaded image to the partition indicated by
+ * cmd_parameter. Writes to response.
+ *
+ * @param response    Pointer to fastboot response buffer
+ */
+static void fb_flash(char *cmd_parameter, char *response)
+{
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+       fb_mmc_flash_write(cmd_parameter, fastboot_buf_addr, image_size,
+                          response);
+#endif
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_NAND)
+       fb_nand_flash_write(cmd_parameter, fastboot_buf_addr, image_size,
+                           response);
+#endif
+}
+
+/**
+ * Erases the partition indicated by cmd_parameter (clear to 0x00s). Writes
+ * to response.
+ *
+ * @param response    Pointer to fastboot response buffer
+ */
+static void fb_erase(char *cmd_parameter, char *response)
+{
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+       fb_mmc_erase(cmd_parameter, response);
+#endif
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_NAND)
+       fb_nand_erase(cmd_parameter, response);
+#endif
+}
+#endif
+
+/**
+ * Sets reboot bootloader flag if requested. Writes to response.
+ *
+ * @param response    Pointer to fastboot response buffer
+ */
+static void fb_reboot_bootloader(char *cmd_parameter, char *response)
+{
+       if (fastboot_set_reboot_flag())
+               fastboot_fail("Cannot set reboot flag", response);
+       else
+               fastboot_okay(NULL, response);
+}
+
+#if CONFIG_IS_ENABLED(FASTBOOT_CMD_OEM_FORMAT)
+static void fb_oem_format(char *cmd_parameter, char *response)
+{
+       char cmdbuf[32];
+
+       if (!env_get("partitions")) {
+               fastboot_fail("partitions not set", response);
+       } else {
+               sprintf(cmdbuf, "gpt write mmc %x $partitions",
+                       CONFIG_FASTBOOT_FLASH_MMC_DEV);
+               if (run_command(cmdbuf, 0))
+                       fastboot_fail("", response);
+               else
+                       fastboot_okay(NULL, response);
+       }
+}
+#endif
diff --git a/drivers/fastboot/fb_common.c b/drivers/fastboot/fb_common.c
index e74f3a0..4cbcbb1 100644
--- a/drivers/fastboot/fb_common.c
+++ b/drivers/fastboot/fb_common.c
@@ -12,6 +12,13 @@
 
 #include <common.h>
 #include <fastboot.h>
+#include <net/fastboot.h>
+
+/* fastboot download buffer */
+void *fastboot_buf_addr;
+u32 fastboot_buf_size;
+
+void (*fastboot_progress_callback)(const char *msg);
 
 /**
  * Writes a response to response buffer of the form "$tag$reason".
@@ -52,3 +59,44 @@ int __weak fastboot_set_reboot_flag(void)
 {
        return -ENOSYS;
 }
+
+void fastboot_boot(void *addr)
+{
+       char *s;
+
+       s = env_get("fastboot_bootcmd");
+       if (s) {
+               run_command(s, CMD_FLAG_ENV);
+       } else {
+               static char boot_addr_start[12];
+               static char *const bootm_args[] = {
+                       "bootm", boot_addr_start, NULL
+               };
+
+               snprintf(boot_addr_start, sizeof(boot_addr_start) - 1,
+                        "0x%lx", (long)addr);
+               printf("Booting kernel at %s...\n\n\n", boot_addr_start);
+
+               do_bootm(NULL, 0, 2, bootm_args);
+
+               /*
+                * This only happens if image is somehow faulty so we start
+                * over. We deliberately leave this policy to the invocation
+                * of fastbootcmd if that's what's being run
+                */
+               do_reset(NULL, 0, 0, NULL);
+       }
+}
+
+void fastboot_set_progress_callback(void (*progress)(const char *msg))
+{
+       fastboot_progress_callback = progress;
+}
+
+void fastboot_init(void *buf_addr, u32 buf_size)
+{
+       fastboot_buf_addr = buf_addr ? buf_addr :
+                                      (void *)CONFIG_FASTBOOT_BUF_ADDR;
+       fastboot_buf_size = buf_size ? buf_size : CONFIG_FASTBOOT_BUF_SIZE;
+       fastboot_set_progress_callback(NULL);
+}
diff --git a/drivers/fastboot/fb_getvar.c b/drivers/fastboot/fb_getvar.c
new file mode 100644
index 0000000..7fc46c3
--- /dev/null
+++ b/drivers/fastboot/fb_getvar.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ */
+
+#include <common.h>
+#include <fastboot.h>
+#include <fb_mmc.h>
+#include <fb_nand.h>
+#include <fs.h>
+#include <version.h>
+
+static void fb_getvar_version(char *var_parameter, char *response);
+static void fb_getvar_bootloader_version(char *var_parameter, char *response);
+static void fb_getvar_downloadsize(char *var_parameter, char *response);
+static void fb_getvar_serialno(char *var_parameter, char *response);
+static void fb_getvar_version_baseband(char *var_parameter, char *response);
+static void fb_getvar_product(char *var_parameter, char *response);
+static void fb_getvar_current_slot(char *var_parameter, char *response);
+static void fb_getvar_slot_suffixes(char *var_parameter, char *response);
+static void fb_getvar_has_slot(char *var_parameter, char *response);
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+static void fb_getvar_partition_type(char *part_name, char *response);
+#endif
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+static void fb_getvar_partition_size(char *part_name, char *response);
+#endif
+
+static const struct {
+       const char *variable;
+       void (*dispatch)(char *var_parameter, char *response);
+} fb_getvar_dispatch[] = {
+       {
+               .variable = "version",
+               .dispatch = fb_getvar_version
+       }, {
+               .variable = "bootloader-version",
+               .dispatch = fb_getvar_bootloader_version
+       }, {
+               .variable = "version-bootloader",
+               .dispatch = fb_getvar_bootloader_version
+       }, {
+               .variable = "downloadsize",
+               .dispatch = fb_getvar_downloadsize
+       }, {
+               .variable = "max-download-size",
+               .dispatch = fb_getvar_downloadsize
+       }, {
+               .variable = "serialno",
+               .dispatch = fb_getvar_serialno
+       }, {
+               .variable = "version-baseband",
+               .dispatch = fb_getvar_version_baseband
+       }, {
+               .variable = "product",
+               .dispatch = fb_getvar_product
+       }, {
+               .variable = "current-slot",
+               .dispatch = fb_getvar_current_slot
+       }, {
+               .variable = "slot-suffixes",
+               .dispatch = fb_getvar_slot_suffixes
+       }, {
+               .variable = "has_slot",
+               .dispatch = fb_getvar_has_slot
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+       }, {
+               .variable = "partition-type",
+               .dispatch = fb_getvar_partition_type
+#endif
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+       }, {
+               .variable = "partition-size",
+               .dispatch = fb_getvar_partition_size
+#endif
+       }
+};
+
+static void fb_getvar_version(char *var_parameter, char *response)
+{
+       fastboot_okay(FASTBOOT_VERSION, response);
+}
+
+static void fb_getvar_bootloader_version(char *var_parameter, char *response)
+{
+       fastboot_okay(U_BOOT_VERSION, response);
+}
+
+static void fb_getvar_downloadsize(char *var_parameter, char *response)
+{
+       fastboot_response("OKAY", response, "0x%08x", fastboot_buf_size);
+}
+
+static void fb_getvar_serialno(char *var_parameter, char *response)
+{
+       const char *tmp = env_get("serial#");
+
+       if (tmp)
+               fastboot_okay(tmp, response);
+       else
+               fastboot_fail("Value not set", response);
+}
+
+static void fb_getvar_version_baseband(char *var_parameter, char *response)
+{
+       fastboot_okay("N/A", response);
+}
+
+static void fb_getvar_product(char *var_parameter, char *response)
+{
+       const char *board = env_get("board");
+
+       if (board)
+               fastboot_okay(board, response);
+       else
+               fastboot_fail("Board not set", response);
+}
+
+static void fb_getvar_current_slot(char *var_parameter, char *response)
+{
+       /* A/B not implemented, for now always return _a */
+       fastboot_okay("_a", response);
+}
+
+static void fb_getvar_slot_suffixes(char *var_parameter, char *response)
+{
+       fastboot_okay("_a,_b", response);
+}
+
+static void fb_getvar_has_slot(char *part_name, char *response)
+{
+       if (part_name && (!strcmp(part_name, "boot") ||
+                         !strcmp(part_name, "system")))
+               fastboot_okay("yes", response);
+       else
+               fastboot_okay("no", response);
+}
+
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+static void fb_getvar_partition_type(char *part_name, char *response)
+{
+       int r;
+       struct blk_desc *dev_desc;
+       disk_partition_t part_info;
+
+       r = fastboot_mmc_get_part_info(part_name, &dev_desc, &part_info,
+                                      response);
+       if (r >= 0) {
+               r = fs_set_blk_dev_with_part(dev_desc, r);
+               if (r < 0)
+                       fastboot_fail("failed to set partition", response);
+               else
+                       fastboot_okay(fs_get_type_name(), response);
+       }
+}
+#endif
+
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+static void fb_getvar_partition_size(char *part_name, char *response)
+{
+       int r;
+       size_t size;
+
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
+       struct blk_desc *dev_desc;
+       disk_partition_t part_info;
+
+       r = fastboot_mmc_get_part_info(part_name, &dev_desc, &part_info,
+                                      response);
+       if (r >= 0)
+               size = part_info.size;
+#endif
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_NAND)
+       struct part_info *part_info;
+
+       r = fastboot_nand_get_part_info(part_name, &part_info, response);
+       if (r >= 0)
+               size = part_info->size;
+#endif
+       if (r >= 0)
+               fastboot_response("OKAY", response, "0x%016zx", size);
+}
+#endif
+
+/**
+ * Writes ascii string specified by cmd_parameter to response.
+ *
+ * @param cmd_parameter        Point to command parameter
+ * @param response     Pointer to fastboot response buffer
+ */
+void fastboot_getvar(char *cmd_parameter, char *response)
+{
+       if (!cmd_parameter) {
+               fastboot_fail("missing var", response);
+       } else {
+#define FASTBOOT_ENV_PREFIX    "fastboot."
+               int i;
+               char *var_parameter = cmd_parameter;
+               char envstr[FASTBOOT_RESPONSE_LEN];
+               const char *s;
+
+               snprintf(envstr, sizeof(envstr) - 1,
+                        FASTBOOT_ENV_PREFIX "%s", cmd_parameter);
+               s = env_get(envstr);
+               if (s) {
+                       fastboot_response("OKAY", response, "%s", s);
+                       return;
+               }
+
+               strsep(&var_parameter, ":");
+               for (i = 0; i < ARRAY_SIZE(fb_getvar_dispatch); ++i) {
+                       if (!strcmp(fb_getvar_dispatch[i].variable,
+                                   cmd_parameter)) {
+                               fb_getvar_dispatch[i].dispatch(var_parameter,
+                                                              response);
+                               return;
+                       }
+               }
+               pr_warn("WARNING: unknown variable: %s\n", cmd_parameter);
+               fastboot_fail("Variable not implemented", response);
+       }
+}
diff --git a/drivers/fastboot/fb_mmc.c b/drivers/fastboot/fb_mmc.c
index 038905f..69a78be 100644
--- a/drivers/fastboot/fb_mmc.c
+++ b/drivers/fastboot/fb_mmc.c
@@ -15,6 +15,8 @@
 #include <linux/compat.h>
 #include <android_image.h>
 
+#define FASTBOOT_MAX_BLK_WRITE 16384
+
 #define BOOT_PARTITION_NAME "boot"
 
 struct fb_mmc_sparse {
@@ -43,13 +45,40 @@ static int part_get_info_by_name_or_alias(struct blk_desc 
*dev_desc,
        return ret;
 }
 
+static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
+                                lbaint_t blkcnt, const void *buffer)
+{
+       lbaint_t blk = start;
+       lbaint_t blks_written;
+       lbaint_t cur_blkcnt;
+       lbaint_t blks = 0;
+       int i;
+
+       for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
+               cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
+               if (buffer) {
+                       if (fastboot_progress_callback)
+                               fastboot_progress_callback("writing");
+                       blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
+                                                 buffer + (i * 
block_dev->blksz));
+               } else {
+                       if (fastboot_progress_callback)
+                               fastboot_progress_callback("erasing");
+                       blks_written = blk_derase(block_dev, blk, cur_blkcnt);
+               }
+               blk += blks_written;
+               blks += blks_written;
+       }
+       return blks;
+}
+
 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
                lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 {
        struct fb_mmc_sparse *sparse = info->priv;
        struct blk_desc *dev_desc = sparse->dev_desc;
 
-       return blk_dwrite(dev_desc, blk, blkcnt, buffer);
+       return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 }
 
 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
@@ -60,7 +89,7 @@ static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage 
*info,
 
 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
                const char *part_name, void *buffer,
-               unsigned int download_bytes, char *response)
+               u32 download_bytes, char *response)
 {
        lbaint_t blkcnt;
        lbaint_t blks;
@@ -77,7 +106,8 @@ static void write_raw_image(struct blk_desc *dev_desc, 
disk_partition_t *info,
 
        puts("Flashing Raw Image\n");
 
-       blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
+       blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
+
        if (blks != blkcnt) {
                pr_err("failed writing to device %d\n", dev_desc->devnum);
                fastboot_fail("failed writing to device", response);
@@ -148,7 +178,7 @@ static lbaint_t fb_mmc_get_boot_header(struct blk_desc 
*dev_desc,
  */
 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
                                void *download_buffer,
-                               unsigned int download_bytes,
+                               u32 download_bytes,
                                char *response)
 {
        uintptr_t hdr_addr;                     /* boot image header address */
@@ -251,8 +281,32 @@ static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 }
 #endif
 
+int fastboot_mmc_get_part_info(char *part_name, struct blk_desc **dev_desc,
+                              disk_partition_t *part_info, char *response)
+{
+       int r;
+
+       *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
+       if (!*dev_desc) {
+               fastboot_fail("block device not found", response);
+               return -ENOENT;
+       }
+       if (!part_name) {
+               fastboot_fail("partition not found", response);
+               return -ENOENT;
+       }
+
+       r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info);
+       if (r < 0) {
+               fastboot_fail("partition not found", response);
+               return r;
+       }
+
+       return r;
+}
+
 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
-                       unsigned int download_bytes, char *response)
+                       u32 download_bytes, char *response)
 {
        struct blk_desc *dev_desc;
        disk_partition_t info;
@@ -389,7 +443,8 @@ void fb_mmc_erase(const char *cmd, char *response)
        printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
               blks_start, blks_start + blks_size);
 
-       blks = blk_derase(dev_desc, blks_start, blks_size);
+       blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
+
        if (blks != blks_size) {
                pr_err("failed erasing from device %d\n", dev_desc->devnum);
                fastboot_fail("failed erasing from device", response);
diff --git a/drivers/fastboot/fb_nand.c b/drivers/fastboot/fb_nand.c
index 849a6f1..a7cbc34 100644
--- a/drivers/fastboot/fb_nand.c
+++ b/drivers/fastboot/fb_nand.c
@@ -88,7 +88,7 @@ static int _fb_nand_erase(struct mtd_info *mtd, struct 
part_info *part)
 }
 
 static int _fb_nand_write(struct mtd_info *mtd, struct part_info *part,
-                         void *buffer, unsigned int offset,
+                         void *buffer, u32 offset,
                          size_t length, size_t *written)
 {
        int flags = WITH_WR_VERIFY;
@@ -145,8 +145,16 @@ static lbaint_t fb_nand_sparse_reserve(struct 
sparse_storage *info,
        return blkcnt + bad_blocks;
 }
 
+int fastboot_nand_get_part_info(char *part_name, struct part_info **part_info,
+                               char *response)
+{
+       struct mtd_info *mtd = NULL;
+
+       return fb_nand_lookup(part_name, &mtd, part_info, response);
+}
+
 void fb_nand_flash_write(const char *cmd, void *download_buffer,
-                        unsigned int download_bytes, char *response)
+                        u32 download_bytes, char *response)
 {
        struct part_info *part;
        struct mtd_info *mtd = NULL;
diff --git a/include/fastboot.h b/include/fastboot.h
index 593e6a7..3d9ffc6 100644
--- a/include/fastboot.h
+++ b/include/fastboot.h
@@ -15,8 +15,39 @@
 #define FASTBOOT_VERSION       "0.4"
 
 /* The 64 defined bytes plus \0 */
+#define FASTBOOT_COMMAND_LEN   (64 + 1)
 #define FASTBOOT_RESPONSE_LEN  (64 + 1)
 
+/**
+ * All known commands to fastboot
+ */
+enum {
+       FASTBOOT_COMMAND_GETVAR = 0,
+       FASTBOOT_COMMAND_DOWNLOAD,
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+       FASTBOOT_COMMAND_FLASH,
+       FASTBOOT_COMMAND_ERASE,
+#endif
+       FASTBOOT_COMMAND_BOOT,
+       FASTBOOT_COMMAND_CONTINUE,
+       FASTBOOT_COMMAND_REBOOT,
+       FASTBOOT_COMMAND_REBOOT_BOOTLOADER,
+       FASTBOOT_COMMAND_SET_ACTIVE,
+#if CONFIG_IS_ENABLED(FASTBOOT_CMD_OEM_FORMAT)
+       FASTBOOT_COMMAND_OEM_FORMAT,
+#endif
+
+       FASTBOOT_COMMAND_COUNT
+};
+
+extern void *fastboot_buf_addr;
+extern u32 fastboot_buf_size;
+
+extern u32 fastboot_bytes_received;
+extern u32 fastboot_bytes_expected;
+
+extern void (*fastboot_progress_callback)(const char *msg);
+
 void fastboot_response(const char *tag, char *response,
                       const char *format, ...)
        __attribute__ ((format (__printf__, 3, 4)));
@@ -24,4 +55,20 @@ void fastboot_response(const char *tag, char *response,
 void fastboot_fail(const char *reason, char *response);
 void fastboot_okay(const char *reason, char *response);
 int fastboot_set_reboot_flag(void);
+
+/**
+ * Writes ascii string specified by cmd_parameter to response.
+ *
+ * @param cmd_parameter        Pointer to variable name
+ * @param response     Pointer to fastboot response buffer
+ */
+void fastboot_getvar(char *cmd_parameter, char *response);
+
+void fastboot_init(void *buf_addr, u32 buf_size);
+void fastboot_set_progress_callback(void (*progress)(const char *msg));
+
+void fastboot_boot(void *addr);
+int fastboot_handle_command(char *cmd_string, char *response);
+void fastboot_download_data(const void *fastboot_data,
+                           unsigned int fastboot_data_len, char *response);
 #endif /* _FASTBOOT_H_ */
diff --git a/include/fb_mmc.h b/include/fb_mmc.h
index 39a960c..ae01f99 100644
--- a/include/fb_mmc.h
+++ b/include/fb_mmc.h
@@ -3,6 +3,12 @@
  * Copyright 2014 Broadcom Corporation.
  */
 
+#ifndef _FB_MMC_H_
+#define _FB_MMC_H_
+
+int fastboot_mmc_get_part_info(char *part_name, struct blk_desc **dev_desc,
+                              disk_partition_t *part_info, char *response);
 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
-                       unsigned int download_bytes, char *response);
+                       u32 download_bytes, char *response);
 void fb_mmc_erase(const char *cmd, char *response);
+#endif
diff --git a/include/fb_nand.h b/include/fb_nand.h
index 2c92a4e..937f9e4 100644
--- a/include/fb_nand.h
+++ b/include/fb_nand.h
@@ -4,6 +4,14 @@
  * Copyright 2015 Free Electrons.
  */
 
+#ifndef _FB_NAND_H_
+#define _FB_NAND_H_
+
+#include <jffs2/load_kernel.h>
+
+int fastboot_nand_get_part_info(char *part_name, struct part_info **part_info,
+                               char *response);
 void fb_nand_flash_write(const char *cmd, void *download_buffer,
-                        unsigned int download_bytes, char *response);
+                        u32 download_bytes, char *response);
 void fb_nand_erase(const char *cmd, char *response);
+#endif
diff --git a/include/net.h b/include/net.h
index 65f51d7..5760685 100644
--- a/include/net.h
+++ b/include/net.h
@@ -535,7 +535,7 @@ extern int          net_restart_wrap;       /* Tried all 
network devices */
 
 enum proto_t {
        BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
-       TFTPSRV, TFTPPUT, LINKLOCAL
+       TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT
 };
 
 extern char    net_boot_file_name[1024];/* Boot File name */
diff --git a/include/net/fastboot.h b/include/net/fastboot.h
new file mode 100644
index 0000000..6860209
--- /dev/null
+++ b/include/net/fastboot.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (C) 2016 The Android Open Source Project
+ */
+
+#ifndef __NET_FASTBOOT_H__
+#define __NET_FASTBOOT_H__
+
+/**********************************************************************/
+/*
+ *     Global functions and variables.
+ */
+
+/**
+ * Wait for incoming fastboot comands.
+ */
+void fastboot_start_server(void);
+
+/**********************************************************************/
+
+#endif /* __NET_FASTBOOT_H__ */
diff --git a/net/Makefile b/net/Makefile
index d1e8e01..0746687 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_CMD_PING) += ping.o
 obj-$(CONFIG_CMD_RARP) += rarp.o
 obj-$(CONFIG_CMD_SNTP) += sntp.o
 obj-$(CONFIG_CMD_TFTPBOOT) += tftp.o
+obj-$(CONFIG_UDP_FUNCTION_FASTBOOT)  += fastboot.o
 
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)
diff --git a/net/fastboot.c b/net/fastboot.c
new file mode 100644
index 0000000..8ec2aa5
--- /dev/null
+++ b/net/fastboot.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ */
+
+#include <common.h>
+#include <fastboot.h>
+#include <net.h>
+#include <net/fastboot.h>
+
+/* Fastboot port # defined in spec */
+#define WELL_KNOWN_PORT 5554
+
+enum {
+       FASTBOOT_ERROR = 0,
+       FASTBOOT_QUERY = 1,
+       FASTBOOT_INIT = 2,
+       FASTBOOT_FASTBOOT = 3,
+};
+
+struct __packed fastboot_header {
+       uchar id;
+       uchar flags;
+       unsigned short seq;
+};
+
+#define PACKET_SIZE 1024
+#define DATA_SIZE (PACKET_SIZE - sizeof(struct fastboot_header))
+
+/* Sequence number sent for every packet */
+static unsigned short fb_sequence_number = 1;
+static const unsigned short fb_packet_size = PACKET_SIZE;
+static const unsigned short fb_udp_version = 1;
+
+/* Keep track of last packet for resubmission */
+static uchar last_packet[PACKET_SIZE];
+static unsigned int last_packet_len;
+
+static struct in_addr fastboot_remote_ip;
+/* The UDP port at their end */
+static int fastboot_remote_port;
+/* The UDP port at our end */
+static int fastboot_our_port;
+
+static void boot_downloaded_image(void);
+
+#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
+/**
+ * Send an INFO packet during long commands
+ *
+ * @param msg: String describing the reason for waiting
+ */
+static void fastboot_udp_send_info(const char *msg)
+{
+       uchar *packet;
+       uchar *packet_base;
+       int len = 0;
+       char response[FASTBOOT_RESPONSE_LEN] = {0};
+
+       struct fastboot_header fb_response_header = {
+               .id = FASTBOOT_FASTBOOT,
+               .flags = 0,
+               .seq = htons(fb_sequence_number)
+       };
+       ++fb_sequence_number;
+       packet = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
+       packet_base = packet;
+
+       /* Write headers */
+       memcpy(packet, &fb_response_header, sizeof(fb_response_header));
+       packet += sizeof(fb_response_header);
+       /* Write response */
+       fastboot_response("INFO", response, "%s", msg);
+       memcpy(packet, response, strlen(response));
+       packet += strlen(response);
+
+       len = packet - packet_base;
+
+       /* Save packet for retransmitting */
+       last_packet_len = len;
+       memcpy(last_packet, packet_base, last_packet_len);
+
+       net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
+                           fastboot_remote_port, fastboot_our_port, len);
+}
+
+/**
+ * Send an INFO packet during long commands based on timer. An INFO packet
+ * is sent if the time is 30 seconds after start. Else, noop.
+ *
+ * @param msg:    String describing the reason for waiting
+ */
+static void fastboot_timed_send_info(const char *msg)
+{
+       static ulong start;
+
+       /* Initialize timer */
+       if (start == 0)
+               start = get_timer(0);
+       ulong time = get_timer(start);
+       /* Send INFO packet to host every 30 seconds */
+       if (time >= 30000) {
+               start = get_timer(0);
+               fastboot_udp_send_info(msg);
+       }
+}
+#endif
+
+/**
+ * Constructs and sends a packet in response to received fastboot packet
+ *
+ * @param fb_header            Header for response packet
+ * @param fastboot_data        Pointer to received fastboot data
+ * @param fastboot_data_len    Length of received fastboot data
+ * @param retransmit           Nonzero if sending last sent packet
+ */
+static void fastboot_send(struct fastboot_header fb_header, char 
*fastboot_data,
+                         unsigned int fastboot_data_len, uchar retransmit)
+{
+       uchar *packet;
+       uchar *packet_base;
+       int len = 0;
+       const char *error_msg = "An error occurred.";
+       short tmp;
+       struct fastboot_header fb_response_header = fb_header;
+       static char command[FASTBOOT_COMMAND_LEN];
+       static int cmd = -1;
+       static bool pending_command;
+       char response[FASTBOOT_RESPONSE_LEN] = {0};
+
+       /*
+        * We will always be sending some sort of packet, so
+        * cobble together the packet headers now.
+        */
+       packet = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
+       packet_base = packet;
+
+       /* Resend last packet */
+       if (retransmit) {
+               memcpy(packet, last_packet, last_packet_len);
+               net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
+                                   fastboot_remote_port, fastboot_our_port,
+                                   last_packet_len);
+               return;
+       }
+
+       fb_response_header.seq = htons(fb_response_header.seq);
+       memcpy(packet, &fb_response_header, sizeof(fb_response_header));
+       packet += sizeof(fb_response_header);
+
+       switch (fb_header.id) {
+       case FASTBOOT_QUERY:
+               tmp = htons(fb_sequence_number);
+               memcpy(packet, &tmp, sizeof(tmp));
+               packet += sizeof(tmp);
+               break;
+       case FASTBOOT_INIT:
+               tmp = htons(fb_udp_version);
+               memcpy(packet, &tmp, sizeof(tmp));
+               packet += sizeof(tmp);
+               tmp = htons(fb_packet_size);
+               memcpy(packet, &tmp, sizeof(tmp));
+               packet += sizeof(tmp);
+               break;
+       case FASTBOOT_ERROR:
+               memcpy(packet, error_msg, strlen(error_msg));
+               packet += strlen(error_msg);
+               break;
+       case FASTBOOT_FASTBOOT:
+               if (cmd == FASTBOOT_COMMAND_DOWNLOAD) {
+                       fastboot_download_data(fastboot_data, fastboot_data_len,
+                                              response);
+               } else if (!pending_command) {
+                       strlcpy(command, fastboot_data,
+                               min((size_t)fastboot_data_len + 1,
+                                   sizeof(command)));
+                       pending_command = true;
+               } else {
+                       cmd = fastboot_handle_command(command, response);
+                       pending_command = false;
+               }
+               /*
+                * Sent some INFO packets, need to update sequence number in
+                * header
+                */
+               if (fb_header.seq != fb_sequence_number) {
+                       fb_response_header.seq = htons(fb_sequence_number);
+                       memcpy(packet_base, &fb_response_header,
+                              sizeof(fb_response_header));
+               }
+               /* Write response to packet */
+               memcpy(packet, response, strlen(response));
+               packet += strlen(response);
+               break;
+       default:
+               pr_err("ID %d not implemented.\n", fb_header.id);
+               return;
+       }
+
+       len = packet - packet_base;
+
+       /* Save packet for retransmitting */
+       last_packet_len = len;
+       memcpy(last_packet, packet_base, last_packet_len);
+
+       net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
+                           fastboot_remote_port, fastboot_our_port, len);
+
+       /* Continue boot process after sending response */
+       if (!strncmp("OKAY", response, 4)) {
+               switch (cmd) {
+               case FASTBOOT_COMMAND_BOOT:
+                       boot_downloaded_image();
+                       break;
+
+               case FASTBOOT_COMMAND_CONTINUE:
+                       net_set_state(NETLOOP_SUCCESS);
+                       break;
+
+               case FASTBOOT_COMMAND_REBOOT:
+               case FASTBOOT_COMMAND_REBOOT_BOOTLOADER:
+                       do_reset(NULL, 0, 0, NULL);
+                       break;
+               }
+       }
+
+       if (!strncmp("OKAY", response, 4) || !strncmp("FAIL", response, 4))
+               cmd = -1;
+}
+
+/**
+ * Boots into downloaded image.
+ */
+static void boot_downloaded_image(void)
+{
+       fastboot_boot(fastboot_buf_addr);
+       net_set_state(NETLOOP_SUCCESS);
+}
+
+/**
+ * Incoming UDP packet handler.
+ *
+ * @param packet  Pointer to incoming UDP packet
+ * @param dport   Destination UDP port
+ * @param sip     Source IP address
+ * @param sport   Source UDP port
+ * @param len     Packet length
+ */
+static void fastboot_handler(uchar *packet, unsigned int dport,
+                            struct in_addr sip, unsigned int sport,
+                            unsigned int len)
+{
+       struct fastboot_header fb_header;
+       char fastboot_data[DATA_SIZE] = {0};
+       unsigned int fastboot_data_len = 0;
+
+       if (dport != fastboot_our_port)
+               return;
+
+       fastboot_remote_ip = sip;
+       fastboot_remote_port = sport;
+
+       if (len < sizeof(struct fastboot_header) || len > PACKET_SIZE)
+               return;
+       memcpy(&fb_header, packet, sizeof(fb_header));
+       fb_header.flags = 0;
+       fb_header.seq = ntohs(fb_header.seq);
+       packet += sizeof(fb_header);
+       len -= sizeof(fb_header);
+
+       switch (fb_header.id) {
+       case FASTBOOT_QUERY:
+               fastboot_send(fb_header, fastboot_data, 0, 0);
+               break;
+       case FASTBOOT_INIT:
+       case FASTBOOT_FASTBOOT:
+               fastboot_data_len = len;
+               if (len > 0)
+                       memcpy(fastboot_data, packet, len);
+               if (fb_header.seq == fb_sequence_number) {
+                       fastboot_send(fb_header, fastboot_data,
+                                     fastboot_data_len, 0);
+                       fb_sequence_number++;
+               } else if (fb_header.seq == fb_sequence_number - 1) {
+                       /* Retransmit last sent packet */
+                       fastboot_send(fb_header, fastboot_data,
+                                     fastboot_data_len, 1);
+               }
+               break;
+       default:
+               pr_err("ID %d not implemented.\n", fb_header.id);
+               fb_header.id = FASTBOOT_ERROR;
+               fastboot_send(fb_header, fastboot_data, 0, 0);
+               break;
+       }
+}
+
+void fastboot_start_server(void)
+{
+       printf("Using %s device\n", eth_get_name());
+       printf("Listening for fastboot command on %pI4\n", &net_ip);
+
+       fastboot_our_port = WELL_KNOWN_PORT;
+
+       fastboot_set_progress_callback(fastboot_timed_send_info);
+       net_set_udp_handler(fastboot_handler);
+
+       /* zero out server ether in case the server ip has changed */
+       memset(net_server_ethaddr, 0, 6);
+}
diff --git a/net/net.c b/net/net.c
index 7f85211..a4932f4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -87,6 +87,7 @@
 #include <environment.h>
 #include <errno.h>
 #include <net.h>
+#include <net/fastboot.h>
 #include <net/tftp.h>
 #if defined(CONFIG_LED_STATUS)
 #include <miiphy.h>
@@ -451,6 +452,11 @@ restart:
                        tftp_start_server();
                        break;
 #endif
+#ifdef CONFIG_UDP_FUNCTION_FASTBOOT
+               case FASTBOOT:
+                       fastboot_start_server();
+                       break;
+#endif
 #if defined(CONFIG_CMD_DHCP)
                case DHCP:
                        bootp_reset();
@@ -1322,6 +1328,7 @@ common:
                /* Fall through */
 
        case NETCONS:
+       case FASTBOOT:
        case TFTPSRV:
                if (net_ip.s_addr == 0) {
                        puts("*** ERROR: `ipaddr' not set\n");
-- 
2.7.4

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