[meta-freescale] Booting imx6q Saber SD

Thomas Senyk thomas.senyk at pelagicore.com
Thu Dec 13 03:03:27 PST 2012


Yesterday I got a Saber SD (as a second board to my SaberLite).
I've used the imx6qsabresd machine config to create a sdcard.

uboot and kernel look like they are working, but the rootfs is not mountable 
during boot.

Here is the corresponding kernel output:

Waiting 2sec before mounting root device...
VFS: Cannot open root device "mmcblk1p2" or unknown-block(179,26)
Please append a correct "root=" boot option; here are the available 
b300         7757824 mmcblk0  driver: mmcblk
b310            2048 mmcblk0boot1  (driver?)
b308            2048 mmcblk0boot0  (driver?)
b318         3880960 mmcblk1  driver: mmcblk
  b319            8192 mmcblk1p1 00000000-0000-0000-0000-000000000000
  b31a          262144 mmcblk1p2 00000000-0000-0000-0000-000000000000
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-

The kernel command line is: 
console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw rootdelay=2

(the 2sec delay is added manually as boot parameter to test if it's a timing 
issue ... it's the same error without the delay)

Anyone seen something like that?
He obviously has problems mounting mmcblk1p2 ... he finds the device and 
partition, but can't mount it.

I can mount and read from it on my desktop, without any problems.
I've tested 2 complete different sdcards, so it's not the sdcard.
I've also tested the android-sdcard which was shipped and that's booting 
flawlessly ... so it's not a HW problem either.


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