Hanumath, There is one other case we came across were sector addressing for mmc cards is required. I don't know if you have seen this case but the patch is below. Philip Some TOSHIBA MMC cards only support sector addressing even though the size is < 2GB. According to JEDEC Spec JESD84-A441-1 the ocr register (bits 30, 29) determine byte/sector mode. Use them. Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx> --- drivers/mmc/core/mmc.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index c139a5e..9303a57 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -378,6 +378,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, int err, ddr = 0; u32 cid[4]; unsigned int max_dtr; + u32 rocr; BUG_ON(!host); WARN_ON(!host->claimed); @@ -391,7 +392,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, mmc_go_idle(host); /* The extra bit indicates that we support high capacity */ - err = mmc_send_op_cond(host, ocr | (1 << 30), NULL); + err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); if (err) goto err; @@ -479,6 +480,13 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, err = mmc_read_ext_csd(card); if (err) goto free_card; + + /* if doing byte addressing check if required to do sector */ + /* addressing. Handle case of cards < 2GB needing sector */ + /* addressing. See section 8.1 JEDEC Standard JED84-A441 */ + /* ocr register has bit 30 set for sector addressing */ + if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) + mmc_card_set_blockaddr(card); /* Erase size depends on CSD and Extended CSD */ mmc_set_erase_size(card); } -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
