Getting Buildroot to Detect MMC

Jimmy Lipham

Hey all,

I have a 4GB/64GB eMMC upboard that I am trying to compile linux for via Buildroot. However, I notice that when I try to run linux (just flashing the disk image to USB and booting off of a USB stick) on the board, there is no /dev/mmc* detected. In fact, dmesg makes no mention of the mmc hardware at all. Booting with ubilinux works just fine and we see the mmc hardware.

I have compiled in almost everything under ATA/AHCI/MMC in the linux configuration, and I _still_ can't get it to detect the hardware.

Has anyone had any luck getting Buildroot/custom Linux kernel up and going with this board? I'm using the 4.9.6 kernel.

Any help would be appreciated!

Thanks!

Dan O'Donovan

Can you verify that you have CONFIG_MMC_SDHCI_ACPI=y in your kernel configuration?

Jimmy Lipham

Hey Dan!

Thanks a bunch for the quick reply, I have the following config options enabled pertaining to MMC support:

CONFIG_MMC=y
# CONFIG_MMC_DEBUG is not set

#
# MMC/SD/SDIO Card Drivers
#
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y
# CONFIG_SDIO_UART is not set
# CONFIG_MMC_TEST is not set

#
# MMC/SD/SDIO Host Controller Drivers
#
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_PCI=y
CONFIG_MMC_RICOH_MMC=y
CONFIG_MMC_SDHCI_ACPI=y
# CONFIG_MMC_SDHCI_PLTFM is not set
CONFIG_MMC_WBSD=y
CONFIG_MMC_TIFM_SD=y
CONFIG_MMC_CB710=y
CONFIG_MMC_VIA_SDMMC=y
CONFIG_MMC_VUB300=y
# CONFIG_MMC_USHC is not set
CONFIG_MMC_USDHI6ROL0=y
CONFIG_MMC_TOSHIBA_PCI=y
CONFIG_MMC_MTK=y