Most cards do not answer if some reserved bits in the ocr are set. However, some controllers can set bit 7 (reserved for low voltages), but how to manage low voltages SD card is not yet specified.
Signed-off-by: Stefano Babic sbabic@denx.de --- drivers/mmc/mmc.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index b69ce15..d91b9b7 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -273,7 +273,15 @@ sd_send_op_cond(struct mmc *mmc)
cmd.cmdidx = SD_CMD_APP_SEND_OP_COND; cmd.resp_type = MMC_RSP_R3; - cmd.cmdarg = mmc->voltages; + + /* + * Most cards do not answer if some reserved bits + * in the ocr are set. However, Some controller + * can set bit 7 (reserved for low voltages), but + * how to manage low voltages SD card is not yet + * specified. + */ + cmd.cmdarg = mmc->voltages & 0xff8000;
if (mmc->version == SD_VERSION_2) cmd.cmdarg |= OCR_HCS;