DONOTMERGE: Hack: Always disable MMC cache to avoid card becoming stuck.
[ 0.210673] mmc0: SDHCI controller on
d4281000.mmc [
d4281000.mmc] using ADMA
[ 0.301489] mmc0: new DDR MMC card at address 0001
[ 0.302156] mmcblk0: mmc0:0001 QNW00A 7.28 GiB
[ 0.308976] mmcblk0boot0: mmc0:0001 QNW00A 4.00 MiB
[ 0.310318] mmcblk0boot1: mmc0:0001 QNW00A 4.00 MiB
[ 0.311571] mmcblk0rpmb: mmc0:0001 QNW00A 512 KiB, chardev (248:0)
[ 171.353426] mmc0: Card stuck being busy! __mmc_poll_for_busy
[ 171.353443] mmc0: cache flush error -110
[ 201.399007] mmc0: Card stuck being busy! __mmc_poll_for_busy
[ 201.399023] mmc0: cache flush error -110
[ 231.415093] mmc0: Card stuck being busy! __mmc_poll_for_busy
[ 231.415109] mmc0: cache flush error -110
[ 261.464688] mmc0: Card stuck being busy! __mmc_poll_for_busy
[ 261.464703] mmc0: cache flush error -110