Hi, commit 21b2cec61c04bd175f0860d9411a472d5a0e7ba1 mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 broke booting rk3399-gru-kevin. The kernel waits forever for the root device to appear on MMC. Removing the line containing PROBE_PREFER_ASYNCHRONOUS in drivers/mmc/host/dw_mmc-rockchip.c fixes the issue. Regards, Vicente.
