Mark Kettenis writes:
>> However, to make sure this diff doesn't break existing lower speed >> modes I'd appreciate tests on a variety of hardware. So if sdmmc(4) >> shows up in your dmesg, please test this by exercising your (u)SD or >> (e)MMC cards. No problems encountered reading/writing the SD card with this diff on RPi4: sdhc0: SDHC 3.0, 250 MHz base clock sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed ... sdhc1 at simplebus4 sdhc1: SDHC 3.0, 100 MHz base clock sdmmc1 at sdhc1: 8-bit, sd high-speed, mmc high-speed, ddr52, dma ... scsibus0 at sdmmc1: 2 targets, initiator 0 sd0 at scsibus0 targ 1 lun 0: <SD/MMC, SB16G, 0080> removable sd0: 15193MB, 512 bytes/sector, 31116288 sectors ... bwfm0 at sdmmc0 function 1 manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 2 not configured manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 3 not configured
