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The High-Speed SD mode stability issue should have been fixed. Increase the MMC max-frequency to improve the IO speed. We can still use the sysfs to limit the clock frequency, e.g. root@OpenWrt:~# echo 25000000 > /sys/kernel/debug/mmc0/clock Signed-off-by: Shiji Yang <yangshiji66@outlook.com> Link: https://github.com/openwrt/openwrt/pull/18896 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>