From: Dzmitry Sankouski <dsankou...@gmail.com>
U-boot is intended to replace linux kernel in android boot image(ABL), and
it's FIT payload to replace initramfs file. The boot process is similar to
boot image with linux:
- android bootloader (ABL) unpacks android boot image
- ABL sets `linux,initrd-start property` in chosen node in unpacked FDT
- ABL sets x0 register to FDT address, and passes control to u-boot
- u-boot reads x0 register, and stores it in `prevbl_fdt_addr` env variable
- u-boot reads `linux,initrd-start` property,
and stores it in `prevbl_initrd_start_addr`
In this way, u-boot bootcmd relies on `prevbl_initrd_start_addr` env
variable, and boils down to `bootm $prevbl_initrd_start_addr`.
If more control on boot process is desired, pack a boot script in
FIT image, and put it to default configuration
What done:
- Rearrange defconfig option order
- Add CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR option
- Doc updates:
- remove wrong SBOOT memory corruption note, because
memory is changed during u-boot bringup process,
not by SBOOT
- put payload on ramdisk place in abl boot image
creation step
Signed-off-by: sankouski-dzmitry <sankouski.dzmi...@gmail.com>
Minkyu Kang <mk7.k...@samsung.com>
---
configs/a3y17lte_defconfig | 11 ++++++-----
configs/a5y17lte_defconfig | 10 ++++++----
configs/a7y17lte_defconfig | 10 ++++++----
doc/board/samsung/axy17lte.rst | 15 +++------------
include/configs/exynos78x0-common.h | 1 +
5 files changed, 22 insertions(+), 25 deletions(-)
diff --git a/configs/a3y17lte_defconfig b/configs/a3y17lte_defconfig
index ddc1801a59..80a7f93325 100644
--- a/configs/a3y17lte_defconfig
+++ b/configs/a3y17lte_defconfig
@@ -1,13 +1,14 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A3Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=8
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_HUSH_PARSER=y
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons
status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if
gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv
VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN
$PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then
setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER;
then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
@@ -16,4 +17,4 @@ CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
-CONFIG_PINCTRL_EXYNOS78x0=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
diff --git a/configs/a5y17lte_defconfig b/configs/a5y17lte_defconfig
index 2534ab0573..c7d4baf67b 100644
--- a/configs/a5y17lte_defconfig
+++ b/configs/a5y17lte_defconfig
@@ -1,13 +1,14 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A5Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=12
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_HUSH_PARSER=y
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons
status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if
gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv
VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN
$PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then
setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER;
then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
@@ -16,3 +17,4 @@ CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
diff --git a/configs/a7y17lte_defconfig b/configs/a7y17lte_defconfig
index a2d76377ab..20a7fb1a8b 100644
--- a/configs/a7y17lte_defconfig
+++ b/configs/a7y17lte_defconfig
@@ -1,13 +1,14 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A7Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=12
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_HUSH_PARSER=y
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons
status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if
gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv
VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN
$PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then
setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER;
then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
@@ -16,3 +17,4 @@ CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
diff --git a/doc/board/samsung/axy17lte.rst b/doc/board/samsung/axy17lte.rst
index e84fefec70..b7f299d1c7 100644
--- a/doc/board/samsung/axy17lte.rst
+++ b/doc/board/samsung/axy17lte.rst
@@ -66,26 +66,17 @@ and is therefore SBOOT's payload.
It may be pure u-boot (with loading u-boot's payload from flash in mind),
or u-boot + u-boot's payload.
-It should be kept in mind, that SBOOT binary patches it's payload after loading
-in address range 0x401f8550-0x401f9280. Given SBOOT loads payload to
0x40001000,
-a range of 0x1f7550-0x1f8280 (2061648-2065024) in a payload file
-will be corrupted after loading to RAM.
-
Creating payload file
"""""""""""""""""""""
- Assemble FIT image for your kernel
-- Create a file for u-boot payload ``touch sboot-payload``
-- Write zeroes till 0x200000 address to be sure SBOOT won't corrupt your info
- ``dd if=/dev/zero of=sboot-payload bs=$((0x200000)) count=1``
-- Write u-boot to the start of the payload ``dd if=<u-boot.bin path>
of=sboot-payload``
-- Write FIT image to payload from 0x200000 address
- ``dd if=<FIT image path> of=sboot-payload seek=1 bs=2M``
Creating android boot image
"""""""""""""""""""""""""""
Once payload created, it's time for android image::
- mkbootimg --base 0x40000000 --kernel_offset 0x00000000 --ramdisk_offset
0x01000000 --tags_offset 0x00000100 --pagesize 2048 --second_offset 0x00f00000
--kernel <sboot-payload path> -o uboot.img
+ uboot=<path to u-boot.bin file>
+ ramdisk=<path to FIT payload file>
+ mkbootimg --base 0x40000000 --kernel_offset 0x00000000 --ramdisk_offset
0x01000000 --tags_offset 0x00000100 --pagesize 2048 --second_offset 0x00f00000
--kernel "$uboot" --ramdisk "$ramdisk" -o uboot.img
Note, that stock Samsung bootloader ignores offsets, set in mkbootimg.
diff --git a/include/configs/exynos78x0-common.h
b/include/configs/exynos78x0-common.h
index 8d3449f028..c4c41bf3e8 100644
--- a/include/configs/exynos78x0-common.h
+++ b/include/configs/exynos78x0-common.h
@@ -85,6 +85,7 @@
#endif
#define EXTRA_ENV_SETTINGS \
+ "bootcmd=bootm $prevbl_initrd_start_addr\0" \
EXYNOS_DEVICE_SETTINGS \
EXYNOS_FDTFILE_SETTING \
MEM_LAYOUT_ENV_SETTINGS
--
2.25.1
