7.1.2 MMC-SPI Mode

The following are the steps to switch the MMC/SDIO mode to MMC-SPI mode on the prebuilt SDCard image

  • Enter uBoot command prompt: press any keys while the SAMA5D27 SOM1 board booting the SDCard image
    CPU:   SAMA5D27 1G bits DDR2 
Crystal frequency:       24 MHz
CPU clock        :      492 MHz
Master clock     :      164 MHz

DRAM:  128 MiB
MMC:   sdio-host@a0000000: 0, sdio-host@b0000000: 1
Loading Environment from FAT... OK
In:    serial@f8020000
Out:   serial@f8020000
Err:   serial@f8020000
Net:   eth0: ethernet@f8008000
Hit any key to stop autoboot:  3
  • Add “wilc_mmc_spi” overlay in “bootcmd_boot” uBoot environment variable. 
    => setenv bootcmd_boot 'fatload mmc 1:1 ${loadaddr} ${board_name}.itb; bootm ${loadaddr}#kernel_dtb${at91_overlays_config}#wilc_mmc_spi'
=> saveenv
  • Reboot the SAMA5D27 SOM1 host board. It is required to manually insert the "wilc-sdio.ko" and the "mmc-spi.ko" over the shell console.