On 15/02/16 10:59, Uwe Kleine-K?nig wrote:

Hello Guenter,

On Sun, Feb 14, 2016 at 08:50:10AM -0800, Guenter Roeck wrote:

quoted

Uwe,

Your patch 'driver-core: platform: probe of-devices only using list of
compatibles' causes the following qemu tests to crash in -next.

arm:vexpress-a9:vexpress_defconfig:vexpress-v2p-ca9
arm:vexpress-a15:vexpress_defconfig:vexpress-v2p-ca15-tc1
arm:vexpress-a9:multi_v7_defconfig:vexpress-v2p-ca9
arm:vexpress-a15:multi_v7_defconfig:vexpress-v2p-ca15-tc1

Crash log:

VFS: Cannot open root device "mmcblk0" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
1f00          131072 mtdblock0  (driver?)
1f01           32768 mtdblock1  (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Can you provide a complete boot log? This might already reveal which
device is failing. It might not be the mmci device but something it
depends on (clock, bus parent, irq).

FWIW the PL180 on my Juno still works fine with this patch picked on top 
of -rc3, so the issue would seem to be something else - From a quick 
comparison between the DTs I see a slight difference in compatible 
strings for the clocks, but the more likely-looking suspect is that the 
VExpress DT references some GPIOs where the Juno DT doesn't.

Robin.

Best regards
Uwe