From: Stephen Warren swarren@nvidia.com
Currently, "mmc dev 0" does not change the selected HW partition. I think it makes more sense if "mmc dev 0" is an alias for "mmc dev 0 0", i.e. that HW partition 0 (main data area) is always selected by default if the user didn't request a specific partition. Otherwise, the following happens, which feels wrong:
Select HW partition 1 (boot0): mmc dev 0 1
Doesn't change the HW partition, so it's still 1 (boot0): mmc dev 0
With this patch, the second command above re-selects the main data area.
Note that some MMC devices (i.e. SD cards) don't support HW partitions. However, this patch still works, since mmc_start_init() sets the current partition number to 0, and mmc_select_hwpart() succeeds if the requested partition is already selected.
Signed-off-by: Stephen Warren swarren@nvidia.com --- This series depends on "mmc: return meaningful error codes from mmc_select_hwpart" (which I just sent) for context.
common/cmd_mmc.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c index eea337506c3f..9e6a26fe62a2 100644 --- a/common/cmd_mmc.c +++ b/common/cmd_mmc.c @@ -403,7 +403,7 @@ static int do_mmc_part(cmd_tbl_t *cmdtp, int flag, static int do_mmc_dev(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { - int dev, part = -1, ret; + int dev, part = 0, ret; struct mmc *mmc;
if (argc == 1) { @@ -426,13 +426,12 @@ static int do_mmc_dev(cmd_tbl_t *cmdtp, int flag, if (!mmc) return CMD_RET_FAILURE;
- if (part != -1) { - ret = mmc_select_hwpart(dev, part); - printf("switch to partitions #%d, %s\n", - part, (!ret) ? "OK" : "ERROR"); - if (ret) - return 1; - } + ret = mmc_select_hwpart(dev, part); + printf("switch to partitions #%d, %s\n", + part, (!ret) ? "OK" : "ERROR"); + if (ret) + return 1; + curr_device = dev; if (mmc->part_config == MMCPART_NOAVAILABLE) printf("mmc%d is current device\n", curr_device);