[U-Boot] [PATCH V4 9/9] COMMON: MMC: Command to support EMMC booting and to

Simon Glass
2013-01-10T16:46:41Z

Hi Amar,

On Fri, Jan 4, 2013 at 1:34 AM, Amar <amarendra.xt@samsung.com> wrote:
> This patch adds commands to open, close and resize boot partitions on EMMC.
>
> Changes from V1:
> 1)Combined the common piece of code between 'open' and 'close'
> operations.
>
> Changes from V2:
> 1)Updation of commit message and resubmition of proper patch set.
>
> Changes from V3:
> No change.
>
> Signed-off-by: Amar <amarendra.xt@samsung.com>
> ---
> common/cmd_mmc.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 83 insertions(+), 1 deletion(-)
>
> diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
> index 7dacd51..1dabb5b 100644
> --- a/common/cmd_mmc.c
> +++ b/common/cmd_mmc.c
> @@ -248,6 +248,84 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> curr_device, mmc->part_num);
>
> return 0;
> + } else if ((strcmp(argv[1], "open") == 0) ||
> + (strcmp(argv[1], "close") == 0)) {

How about putting this block in its own function?

> + int dev;
> + struct mmc *mmc;
> +
> + if (argc == 2)
> + dev = curr_device;
> + else if (argc == 3)
> + dev = simple_strtoul(argv[2], NULL, 10);
> + else
> + return CMD_RET_USAGE;
> +
> + mmc = find_mmc_device(dev);
> + if (!mmc) {
> + printf("no mmc device at slot %x\n", dev);
> + return 1;
> + }
> +
> + if (IS_SD(mmc)) {
> + printf("SD device cannot be opened/closed\n");
> + return 1;
> + }
> +
> + if (strcmp(argv[1], "open") == 0) {
> + if (!(mmc_boot_open(mmc))) {
> + printf("EMMC OPEN Success.\n");
> + printf("\t\t\t!!!Notice!!!\n");
> + printf("!You must close EMMC"
> + " boot Partition after all"
> + " images are written\n");

Do you need to split these strings so much? Perhaps when it is in a
function the indenting will be less?

> + printf("!EMMC boot partition"
> + " has continuity at"
> + " image writing time.\n");
> + printf("!So, Do not close boot"
> + " partition, Before, all"
> + " images are written.\n");
> + return 0;
> + } else {
> + printf("EMMC OPEN Failed.\n");
> + return 1;

You could put this above the other block and reduce indenting:

if (mmc_boot_open(mmc)) {
printf("EMMC OPEN Failed.\n");
return 1;
}
...code continues

> + }
> + }
> +
> + if (strcmp(argv[1], "close") == 0) {
> + if (!(mmc_boot_close(mmc))) {
> + printf("EMMC CLOSE Success.\n");

Shouldn't print a message on success

> + return 0;
> + } else {
> + printf("EMMC CLOSE Failed.\n");
> + return 1;
> + }
> + }
> + } else if (strcmp(argv[1], "bootpart") == 0) {
> + int dev;
> + dev = simple_strtoul(argv[2], NULL, 10);
> +
> + u32 bootsize = simple_strtoul(argv[3], NULL, 10);
> + u32 rpmbsize = simple_strtoul(argv[4], NULL, 10);
> + struct mmc *mmc = find_mmc_device(dev);
> + if (!mmc) {
> + printf("no mmc device at slot %x\n", dev);
> + return 1;
> + }
> +
> + if (IS_SD(mmc)) {
> + printf("It is not a EMMC device\n");
> + return 1;
> + }
> +
> + if (0 == mmc_boot_partition_size_change(mmc,
> + bootsize, rpmbsize)) {
> + printf("EMMC boot partition Size %d MB\n", bootsize);
> + printf("EMMC RPMB partition Size %d MB\n", rpmbsize);
> + return 0;
> + } else {
> + printf("EMMC boot partition Size change Failed.\n");
> + return 1;
> + }
> }
>
> state = MMC_INVALID;
> @@ -317,5 +395,9 @@ U_BOOT_CMD(
> "mmc rescan\n"
> "mmc part - lists available partition on current mmc device\n"
> "mmc dev [dev] [part] - show or set current mmc device [partition]\n"
> - "mmc list - lists available devices");
> + "mmc list - lists available devices\n"
> + "mmc open <device num> - opens the specified device\n"
> + "mmc close <device num> - closes the specified device\n"
> + "mmc bootpart <device num> <boot part size MB> <RPMB part size MB>\n"
> + " - change sizes of boot and RPMB partions of specified device\n");
> #endif

Also did you see Wolfgang's suggestion that we put the partition stuff
in the 'part' command (at least that's what I think he said). You
could have 'part open', 'part close' and maybe 'part resize'?

Regards,
Simon

> --
> 1.8.0
>