[PATCH V2] dfu: add DFU_SKIP layout concept

[Jaehoon Chung]

Oops, Discard this.. Sorry.

On 11/9/20 8:51 PM, Jaehoon Chung wrote:
> Add DFU_SKIP layout ccocept.
> If layout is "skip", it will be skipped after nothing to do.
> It's useful to support multiple board with one tar file.
> 
> Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
> Reviewed-by: Minkyu Kang <mk7.kang at samsung.com>
> ---
> V2: Fix typo and Minkyu's reviewed-tag
> ---
>  doc/README.dfu        | 10 +++++++++-
>  drivers/dfu/dfu.c     |  2 +-
>  drivers/dfu/dfu_mmc.c |  9 +++++++++
>  include/dfu.h         |  1 +
>  4 files changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/README.dfu b/doc/README.dfu
> index 4b9f88354072..827d300e251f 100644
> --- a/doc/README.dfu
> +++ b/doc/README.dfu
> @@ -17,7 +17,7 @@ Overview:
>    - The access to mediums is done in DFU backends (driver/dfu)
>  
>    Today the supported DFU backends are:
> -  - MMC (RAW or FAT / EXT2 / EXT3 / EXT4 file system)
> +  - MMC (RAW or FAT / EXT2 / EXT3 / EXT4 file system / SKIP)
>    - NAND
>    - RAM
>    - SF (serial flash)
> @@ -91,6 +91,7 @@ Commands:
>        <name> part <dev> <part_id> [mmcpart <num>]  raw access to partition
>        <name> fat <dev> <part_id> [mmcpart <num>]   file in FAT partition
>        <name> ext4 <dev> <part_id> [mmcpart <num>]  file in EXT4 partition
> +      <name> skip 0 0				   Skip after Nothing to do
>  
>        with <partid> being the GPT or DOS partition index,
>        with <num> being the eMMC hardware partition number.
> @@ -103,6 +104,13 @@ Commands:
>  
>        "u-boot raw 0x80 0x800;uImage ext4 0 2"
>  
> +    If don't want to flash image file to storage, use "skip" layout.
> +    - It can be protected to flash wrong image with specific board name.
> +    - Especailly, this layout will be useful when thor protocol is used.
> +     For example, if make a tar file to support two board with u-boot-<board1>.bin
> +	and u-boot-<board2>.bin, it can make to flash a proper u-boot without fail.
> +      "u-boot-<board1>.bin raw 0x80 0x800; u-boot-<board2>.bin skip 0 0"
> +
>    "nand" (raw slc nand device)
>      cmd: dfu 0 nand <dev>
>      each element in "dfu_alt_info" =
> diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
> index a298c2c43999..f679f1fa5fe5 100644
> --- a/drivers/dfu/dfu.c
> +++ b/drivers/dfu/dfu.c
> @@ -614,7 +614,7 @@ const char *dfu_get_dev_type(enum dfu_device_type t)
>  const char *dfu_get_layout(enum dfu_layout l)
>  {
>  	const char *const dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
> -					  "EXT3", "EXT4", "RAM_ADDR" };
> +					  "EXT3", "EXT4", "RAM_ADDR", "SKIP" };
>  	return dfu_layout[l];
>  }
>  
> diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
> index 691d01c7ebdf..c7c324b0a986 100644
> --- a/drivers/dfu/dfu_mmc.c
> +++ b/drivers/dfu/dfu_mmc.c
> @@ -108,6 +108,8 @@ static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
>  	case DFU_FS_EXT4:
>  		fstype = FS_TYPE_EXT;
>  		break;
> +	case DFU_SKIP:
> +		return 0;
>  	default:
>  		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
>  		       dfu_get_layout(dfu->layout));
> @@ -204,6 +206,9 @@ int dfu_write_medium_mmc(struct dfu_entity *dfu,
>  	case DFU_FS_EXT4:
>  		ret = mmc_file_buf_write(dfu, offset, buf, len);
>  		break;
> +	case DFU_SKIP:
> +		ret = 0;
> +		break;
>  	default:
>  		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
>  		       dfu_get_layout(dfu->layout));
> @@ -238,6 +243,8 @@ int dfu_get_medium_size_mmc(struct dfu_entity *dfu, u64 *size)
>  		if (ret < 0)
>  			return ret;
>  		return 0;
> +	case DFU_SKIP:
> +		return 0;
>  	default:
>  		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
>  		       dfu_get_layout(dfu->layout));
> @@ -399,6 +406,8 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
>  		dfu->layout = DFU_FS_FAT;
>  	} else if (!strcmp(entity_type, "ext4")) {
>  		dfu->layout = DFU_FS_EXT4;
> +	} else if (!strcmp(entity_type, "skip")) {
> +		dfu->layout = DFU_SKIP;
>  	} else {
>  		pr_err("Memory layout (%s) not supported!\n", entity_type);
>  		return -ENODEV;
> diff --git a/include/dfu.h b/include/dfu.h
> index 84abdc79acd1..2e8276c69c9f 100644
> --- a/include/dfu.h
> +++ b/include/dfu.h
> @@ -33,6 +33,7 @@ enum dfu_layout {
>  	DFU_FS_EXT3,
>  	DFU_FS_EXT4,
>  	DFU_RAM_ADDR,
> +	DFU_SKIP,
>  };
>  
>  enum dfu_op {
>