Hi Afzal,
> DFU spec mentions it as a method to upgrade firmware (software stored
> in writable non-volatile memory). It also says other potential uses of
> DFU is beyond scope of the spec.
>
> Here such a beyond the scope use is being attempted - directly pumping
> binary images from host via USB to RAM. This facility is a developer
> centric one in that it gives advantage over upgrading non-volatile
> memory for testing new images every time during development and/or
> testing.
>
> Directly putting image onto RAM would speed up upgrade process. This
> and convenience was the initial thoughts that led to doing this, speed
> improvement over MMC was only 1 second though - 6 sec on RAM as
> opposed to 7 sec on MMC in beagle bone,
Which version of dfu-util do you use? I had slow transmission problem
with "ancient" dfu-util version 0.1.
> perhaps enabling cache and/or
> optimizing DFU framework to avoid multiple copy for ram (if worth)
> may help, and on other platforms and other boot media like NAND maybe
> improvement would be higher.
>
> And for a platform that doesn't yet have proper DFU suppport for
> non-volatile media's, DFU to RAM can be used.
>
> Another minor advantage would be to increase life of mmc/nand as it
> would be less used during development/testing.
>
> usage: <image name> ram <start address> <size>
> eg. kernel ram 0x81000000 0x1000000
>
> Downloading images to RAM using DFU is not something new, this is
> acheived in openmoko also.
>
> DFU on RAM can be used for extracting RAM contents to host using dfu
> upload. Perhaps this can be extended to io for squeezing out register
> dump through usb, if it is worth.
>
> Signed-off-by: Afzal Mohammed <afzal.mohd...@gmail.com>
> Cc: Lukasz Majewski <l.majew...@samsung.com>
> Cc: Pantelis Antoniou <pa...@antoniou-consulting.com>
> ---
>
> v2: remove read/write enumerator define's, instead use new common ones
>
> drivers/dfu/Makefile | 1 +
> drivers/dfu/dfu.c | 7 +++--
> drivers/dfu/dfu_ram.c | 77
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> include/dfu.h | 18 ++++++++++++ 4 files changed, 101
> insertions(+), 2 deletions(-) create mode 100644 drivers/dfu/dfu_ram.c
>
> diff --git a/drivers/dfu/Makefile b/drivers/dfu/Makefile
> index fca370a..de9e44e 100644
> --- a/drivers/dfu/Makefile
> +++ b/drivers/dfu/Makefile
> @@ -12,6 +12,7 @@ LIB = $(obj)libdfu.o
> COBJS-$(CONFIG_DFU_FUNCTION) += dfu.o
> COBJS-$(CONFIG_DFU_MMC) += dfu_mmc.o
> COBJS-$(CONFIG_DFU_NAND) += dfu_nand.o
> +COBJS-$(CONFIG_DFU_RAM) += dfu_ram.o
>
> SRCS := $(COBJS-y:.o=.c)
> OBJS := $(addprefix $(obj),$(COBJS-y))
> diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
> index d73d510..7b3d05d 100644
> --- a/drivers/dfu/dfu.c
> +++ b/drivers/dfu/dfu.c
> @@ -325,6 +325,9 @@ static int dfu_fill_entity(struct dfu_entity
> *dfu, char *s, int alt, } else if (strcmp(interface, "nand") == 0) {
> if (dfu_fill_entity_nand(dfu, s))
> return -1;
> + } else if (strcmp(interface, "ram") == 0) {
> + if (dfu_fill_entity_ram(dfu, s))
> + return -1;
> } else {
> printf("%s: Device %s not (yet) supported!\n",
> __func__, interface);
> @@ -374,14 +377,14 @@ int dfu_config_entities(char *env, char
> *interface, int num)
> const char *dfu_get_dev_type(enum dfu_device_type t)
> {
> - const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND" };
> + const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND",
> "RAM" }; return dev_t[t];
> }
>
> const char *dfu_get_layout(enum dfu_layout l)
> {
> const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
> - "EXT3", "EXT4" };
> + "EXT3", "EXT4",
> "RAM_ADDR" }; return dfu_layout[l];
> }
>
> diff --git a/drivers/dfu/dfu_ram.c b/drivers/dfu/dfu_ram.c
> new file mode 100644
> index 0000000..a603bfb
> --- /dev/null
> +++ b/drivers/dfu/dfu_ram.c
> @@ -0,0 +1,77 @@
> +/*
> + * (C) Copyright 2013
> + * Afzal Mohammed <afzal.mohd...@gmail.com>
> + *
> + * Reference: dfu_mmc.c
> + * Copyright (C) 2012 Samsung Electronics
> + * author: Lukasz Majewski <l.majew...@samsung.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <malloc.h>
> +#include <errno.h>
> +#include <dfu.h>
> +
> +static int dfu_transfer_medium_ram(enum dfu_op op, struct dfu_entity
> *dfu,
> + u64 offset, void *buf, long *len)
> +{
> + if (dfu->layout != DFU_RAM_ADDR) {
> + printf("%s: unsupported layout :%s\n", __func__,
> + dfu_get_layout(dfu->layout));
Please use error() from ./include/common.h
Frankly, I've overlooked this when I originally
developed the code.
> + return -EINVAL;
> + }
> +
> + if (offset > dfu->data.ram.size) {
> + printf("%s: request exceeds allowed area\n",
> __func__);
The same here.
> + return -EINVAL;
> + }
> +
> + if (op == DFU_OP_WRITE)
> + memcpy(dfu->data.ram.start + offset, buf, *len);
> + else
> + memcpy(buf, dfu->data.ram.start + offset, *len);
> +
> + return 0;
> +}
> +
> +static int dfu_write_medium_ram(struct dfu_entity *dfu, u64 offset,
> + void *buf, long *len)
> +{
> + return dfu_transfer_medium_ram(DFU_OP_WRITE, dfu, offset,
> buf, len); +}
> +
> +static int dfu_read_medium_ram(struct dfu_entity *dfu, u64 offset,
> + void *buf, long *len)
> +{
> + if (!*len) {
> + *len = dfu->data.ram.size;
> + return 0;
> + }
> +
> + return dfu_transfer_medium_ram(DFU_OP_READ, dfu, offset,
> buf, len); +}
> +
> +int dfu_fill_entity_ram(struct dfu_entity *dfu, char *s)
> +{
> + char *st;
> +
> + dfu->dev_type = DFU_DEV_RAM;
> + st = strsep(&s, " ");
> + if (strcmp(st, "ram")) {
> + printf("%s: unsupported device: %s\n", __func__, st);
And here
> + return -ENODEV;
> + }
> +
> + dfu->layout = DFU_RAM_ADDR;
> + dfu->data.ram.start = (void *)simple_strtoul(s, &s, 16);
> + dfu->data.ram.size = simple_strtoul(++s, &s, 16);
> +
> + dfu->write_medium = dfu_write_medium_ram;
> + dfu->read_medium = dfu_read_medium_ram;
> +
> + dfu->inited = 0;
> +
> + return 0;
> +}
> diff --git a/include/dfu.h b/include/dfu.h
> index 6115d90..693ecb8 100644
> --- a/include/dfu.h
> +++ b/include/dfu.h
> @@ -19,6 +19,7 @@ enum dfu_device_type {
> DFU_DEV_MMC = 1,
> DFU_DEV_ONENAND,
> DFU_DEV_NAND,
> + DFU_DEV_RAM,
> };
>
> enum dfu_layout {
> @@ -27,6 +28,7 @@ enum dfu_layout {
> DFU_FS_EXT2,
> DFU_FS_EXT3,
> DFU_FS_EXT4,
> + DFU_RAM_ADDR,
> };
>
> enum dfu_op {
> @@ -56,6 +58,11 @@ struct nand_internal_data {
> unsigned int ubi;
> };
>
> +struct ram_internal_data {
> + void *start;
> + unsigned int size;
> +};
> +
> static inline unsigned int get_mmc_blk_size(int dev)
> {
> return find_mmc_device(dev)->read_bl_len;
> @@ -81,6 +88,7 @@ struct dfu_entity {
> union {
> struct mmc_internal_data mmc;
> struct nand_internal_data nand;
> + struct ram_internal_data ram;
> } data;
>
> int (*read_medium)(struct dfu_entity *dfu,
> @@ -142,4 +150,14 @@ static inline int dfu_fill_entity_nand(struct
> dfu_entity *dfu, char *s) }
> #endif
>
> +#ifdef CONFIG_DFU_RAM
> +extern int dfu_fill_entity_ram(struct dfu_entity *dfu, char *s);
> +#else
> +static inline int dfu_fill_entity_ram(struct dfu_entity *dfu, char
> *s) +{
> + puts("RAM support not available!\n");
> + return -1;
> +}
> +#endif
> +
> #endif /* __DFU_ENTITY_H_ */
Only please change the printf() -> error().
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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