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 >>>> >>>> >>> >> > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot