On Mar 5, 2011 6:16 AM, "Linus Walleij" <linus.walleij@xxxxxxxxxxxxxx> wrote:
> This patch is a squash of patches from Gary King and Ulf
> Hansson done in Android trees, hopefully fixing the issue properly.
>
> The csd sector count reported by eMMC 4.3+ cards includes the boot
> partition size; subtract this from the size reported to the disk
> since the boot partition is inaccessible.
>
> Signed-off-by: Gary King <gking@xxxxxxxxxx>
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
> drivers/mmc/core/mmc.c | 7 +++++++
> include/linux/mmc/mmc.h | 1 +
> 2 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 14e95f3..03c3283 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -255,6 +255,13 @@ static int mmc_read_ext_csd(struct mmc_card *card)
> /* Cards with density > 2GiB are sector addressed */
> if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
> mmc_card_set_blockaddr(card);
> +
> + if (card->ext_csd.sectors) {
> + unsigned boot_sectors;
> + /* size is in 256K chunks, i.e. 512 sectors each */
> + boot_sectors = ext_csd[EXT_CSD_BOOT_SIZE_MULTI] * 512;
> + card->ext_csd.sectors -= boot_sectors;
> + }
> }
>
> switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 264ba54..4516fc1 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -267,6 +267,7 @@ struct _mmc_csd {
> #define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */
> #define EXT_CSD_ERASE_TIMEOUT_MULT 223 /* RO */
> #define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */
> +#define EXT_CSD_BOOT_SIZE_MULTI 226 /* RO */
> #define EXT_CSD_SEC_TRIM_MULT 229 /* RO */
> #define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
> #define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
> --
> 1.7.3.2
>
> --
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+Colin Cross
I think Colin mentioned the emmc spec doesn't subtract the boot
sectors, just that some out of spec devices do... (sounds like another
use for mmc blk quirks)
(I really hope this gets sent as plain text)
Thanks,
A
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