Hi,
On 2017년 11월 16일 21:29, Guillaume Gardet wrote:
I found a workaround. If I disable MMC_MODE_HS_52MHz, then it is working fine.
I guess there is a better way to implement the following patch ?
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 23f642980b..a6a0934eef 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -508,7 +508,8 @@ void dwmci_setup_cfg(struct mmc_config *cfg, struct dwmci_host *host, cfg->host_caps |= MMC_MODE_4BIT; cfg->host_caps &= ~MMC_MODE_8BIT; } - cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz; + /* MMC_MODE_HS_52MHz is broken (at least) on Samsung Snow, so disbale it for now */ + cfg->host_caps |= MMC_MODE_HS;
It means that card is running the lower clock frequency..it's not solution. Timing issue and some problems should be fixed with lowest frequency.
Now, i can't test and check more detail. After back to my office or home, i will check what main cause.
Best Regards, Jaehoon Chung
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT; }
Guillaume
Le 15/11/2017 à 11:27, Guillaume Gardet a écrit :
Le 15/11/2017 à 11:22, Guillaume Gardet a écrit :
Forgot to Cc ML. Done now.
Le 15/11/2017 à 11:14, Guillaume Gardet a écrit :
Hello,
I tested U-Boot v2017.09 on a Samsung Snow (Chromebook ARM) and while mmc0 (internal eMMC) is working fine, mmc1 (external SD slot) does not work. I get the following error for 'mmc dev 1' command: mmc_init: -110, time 30
Please also note that on boot (or on 1st 'mmc dev 1' cmd if I stop auto-boot), I firstly get: mmc_init: -5, time 39
Then, all next attempts retruns: mmc_init: -110, time 30
Guillaume
Any idea what could be wrong?
Guillaume
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