Hi Stephen, On Sun, 2020-01-19 at 20:17 -0800, Stephen Brennan wrote: > When booting Raspberry Pi 4B using a micro SDHC UHS class 1 card, the SD > card partitions never appear in /dev. According to the device tree > bindings for Broadcom IPROC SDHCI controller, we should use > "brcm,bcm2711-emmc2" compatible string on BCM2711. Set this compatible > string, which allows these cards to be mounted. > > Signed-off-by: Stephen Brennan <stephen@xxxxxxxxxx> Your UHS class 1 card should work out of the box using the current kernel version. Note that the device node is defined here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/bcm2711.dtsi?h=v5.5-rc7#n255 and enabled here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/bcm2711-rpi-4-b.dts?h=v5.5-rc7#n98 Regards, Nicolas
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