The Raspberry Pi (bcm283x SoC) family contains 2 IP blocks to drive SD peripherals: A pretty standard SDHCI one called iProc and a home grown one called "sdhost".
When driving U-Boot by the same device tree that we use for Linux, we end up in situations where only the "sdhost" device is available for use. In those situations, current U-Boot can simply not drive the SD card, because the device tree disables the SDHCI device. This patch set also adds support for pinmuxing the SD devices properly to their respective pins. This is necessary because the RPi firmware doesn't mux the SD pins according to the device tree but instead expects the payload (usually Linux, U-Boot for us) to do that. With this patch set, I can successfully use U-Boot on a RPi3 Compute Module with CONFIG_OF_BOARD=y and a device tree generated by the RPi firmware (plus a few overlays in config.txt for vc4, serial, etc). Alexander Graf (3): bcm2835_gpio: Add support for pinmux mmc: Add bcm2835 sdhost controller mmc: bcm2835_sdhci: Add pinmux support arch/arm/mach-bcm283x/include/mach/gpio.h | 1 + drivers/gpio/bcm2835_gpio.c | 40 ++ drivers/mmc/Kconfig | 14 + drivers/mmc/Makefile | 1 + drivers/mmc/bcm2835_sdhci.c | 11 + drivers/mmc/bcm2835_sdhost.c | 1000 +++++++++++++++++++++++++++++ 6 files changed, 1067 insertions(+) create mode 100644 drivers/mmc/bcm2835_sdhost.c -- 2.12.3 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
