[PATCH] cmd: mmc: add mmc partboot

[Jaehoon Chung]

Dear Grygorii,

On 2/12/21 7:32 PM, grygorii tertychnyi wrote:
> This patch allows to determine active boot partition in boot script:
> 
> if mmc partboot ${mmcdev} 2; then
>     echo "booted from eMMC boot1 partition"
> fi

I don't know what purpose this patch has.

Best Regards,
Jaehoon Chung

> 
> Signed-off-by: Grygorii Tertychnyi <grygorii.tertychnyi at leica-geosystems.com>
> ---
>  cmd/mmc.c | 39 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/cmd/mmc.c b/cmd/mmc.c
> index 1529a3e05ddd..010d6ab9aa19 100644
> --- a/cmd/mmc.c
> +++ b/cmd/mmc.c
> @@ -771,6 +771,41 @@ static int do_mmc_boot_resize(struct cmd_tbl *cmdtp, int flag,
>  	return CMD_RET_SUCCESS;
>  }
>  
> +static int do_mmc_partboot(struct cmd_tbl *cmdtp, int flag,
> +			   int argc, char *const argv[])
> +{
> +	int dev;
> +	struct mmc *mmc;
> +	u8 part_args, part_emmc;
> +
> +	if (argc != 3)
> +		return CMD_RET_USAGE;
> +
> +	dev = simple_strtoul(argv[1], NULL, 10);
> +
> +	mmc = init_mmc_device(dev, false);
> +	if (!mmc)
> +		return CMD_RET_FAILURE;
> +
> +	if (IS_SD(mmc)) {
> +		puts("PARTITION_CONFIG only exists on eMMC\n");
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	if (mmc->part_config == MMCPART_NOAVAILABLE) {
> +		printf("No part_config info for ver. 0x%x\n", mmc->version);
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	part_emmc = EXT_CSD_EXTRACT_BOOT_PART(mmc->part_config);
> +	part_args = simple_strtoul(argv[2], NULL, 10);
> +
> +	if (part_emmc == part_args)
> +		return CMD_RET_SUCCESS;
> +	else
> +		return CMD_RET_FAILURE;
> +}
> +
>  static int mmc_partconf_print(struct mmc *mmc)
>  {
>  	u8 ack, access, part;
> @@ -953,6 +988,7 @@ static struct cmd_tbl cmd_mmc[] = {
>  #ifdef CONFIG_SUPPORT_EMMC_BOOT
>  	U_BOOT_CMD_MKENT(bootbus, 5, 0, do_mmc_bootbus, "", ""),
>  	U_BOOT_CMD_MKENT(bootpart-resize, 4, 0, do_mmc_boot_resize, "", ""),
> +	U_BOOT_CMD_MKENT(partboot, 3, 0, do_mmc_partboot, "", ""),
>  	U_BOOT_CMD_MKENT(partconf, 5, 0, do_mmc_partconf, "", ""),
>  	U_BOOT_CMD_MKENT(rst-function, 3, 0, do_mmc_rst_func, "", ""),
>  #endif
> @@ -1021,6 +1057,9 @@ U_BOOT_CMD(
>  	" - Set the BOOT_BUS_WIDTH field of the specified device\n"
>  	"mmc bootpart-resize <dev> <boot part size MB> <RPMB part size MB>\n"
>  	" - Change sizes of boot and RPMB partitions of specified device\n"
> +	"mmc partboot dev boot_partition\n"
> +	" - Return success if the given boot_partition value matches BOOT_PARTITION_ENABLE\n"
> +	"   bit field of the specified device\n"
>  	"mmc partconf dev [boot_ack boot_partition partition_access]\n"
>  	" - Show or change the bits of the PARTITION_CONFIG field of the specified device\n"
>  	"mmc rst-function dev value\n"
>