mmc0: error -110
root@rock64:~# cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION="9 (stretch)"
root@rock64:~# uname -a
Linux rock64 4.4.77-rockchip-ayufan-136 #1 SMP Thu Oct 12 09:14:48 UTC 2017 aarch64 GNU/Linux

getting these errors on the console on a periodic basis: Sad

root@rock64:~# bash
root@rock64:~# [  354.386841] mmc0: switch to bus width 8 failed
[  354.401069] mmc0: mmc_select_hs200 failed, error -110
[  354.401897] mmc0: error -110 whilst initialising MMC card

found url's that are related:

using toshiba brand microssd
are you booting from eMMC or sdcard?
Come have a chat in the Pine IRC channel >>
from sd card, it's a toshiba unlike the rest of my sd's that are mainly sandisk, i might try putting the same os on a sandisk sd and see if i still get the errors.
The error you posted is related to the mmc bus where the eMMC is on, not regarding the mmc bus where the sdcard is.... do you have a eMMC module on the board?
Come have a chat in the Pine IRC channel >>
yes i have a 16gb emmc i got thru ameridroid (, have the jumper in place to bypass it during the boot.
wih the jumper out it does successfully boot into debian stretch, will try pul the jumper and boot from emmc to see if i get the same errors.
If you leave the jumper on until Linux boots, the error is expected, since the jumper disables eMMC clock...
Come have a chat in the Pine IRC channel >>
i rebooted the sdcard with the jumper for the installed emmc pulled off 2 seconds after booting. Error is no longer present,so your suggestion works.
As a bonus now run fsck on mmc0 and fix some errors it would show when booting from emmc.

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