Currently both micro SD cards and eMMC storage attached to a Pi 4 are running in single data rate mode only. However the controller used supports dual data rate modes. This patch enables ddr modes for both sd and mmc storage. I've verified that there are no issues transferring data in ddr mode using multiple micro SD cards and eMMC modules from different vendors. Additionally I've checked signal integrity on the data lines at the micro SD card slot and did not find any issues there either. Tobias Schramm (1): ARM: dts: bcm2711: Enable ddr modes on emmc2 controller arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++ 1 file changed, 2 insertions(+) -- 2.28.0
