SD Card detected but not EMMC

PhoenixMage · April 29, 2020, 12:27pm

I was messing with my mainline kernel and somehow have made it so my SD card is detected on boot but not my EMMC.

Does anyone have any idea what CONFIG I have missed in my kernel? I have tried back tracking but obviously still missing something.

piter75 · April 30, 2020, 7:30am

If that’s a configuration issue you could take some hints from this Armbian config section:

github.com

armbian/build/blob/master/config/kernel/linux-rockchip64-current.config#L6215


CONFIG_MMC=y
CONFIG_PWRSEQ_EMMC=y
CONFIG_PWRSEQ_SD8787=m
CONFIG_PWRSEQ_SIMPLE=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=32
# CONFIG_SDIO_UART is not set
# CONFIG_MMC_TEST is not set


#
# MMC/SD/SDIO Host Controller Drivers
#
# CONFIG_MMC_DEBUG is not set
CONFIG_MMC_ARMMMCI=y
CONFIG_MMC_STM32_SDMMC=y
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_IO_ACCESSORS=y
# CONFIG_MMC_SDHCI_PCI is not set
CONFIG_MMC_SDHCI_PLTFM=y
CONFIG_MMC_SDHCI_OF_ARASAN=y
CONFIG_MMC_SDHCI_OF_ASPEED=m

If not do you observe any specific errors in the kernel logs regarding mmc2?
Maybe something like this?

[ 53.515437] mmc2: mmc_select_hs400es failed, error -84
[ 53.515446] mmc2: error -84 whilst initialising MMC card
[ 53.637621] mmc2: mmc_select_hs400es failed, error -84
[ 53.637632] mmc2: error -84 whilst initialising MMC card
[ 53.777039] mmc2: mmc_select_hs400es failed, error -110
[ 53.777059] mmc2: error -110 whilst initialising MMC card
[ 53.968760] mmc2: mmc_select_hs400es failed, error -110
[ 53.968777] mmc2: error -110 whilst initialising MMC card

PhoenixMage · April 30, 2020, 1:08pm

Thanks for your reponse.

Turns out as irritating as it is that I needed to add rootwait to my kernel command line, go figure…