Hi,

On 04/03/2014 05:22 PM, Stefan Monnier wrote:
>>> This is probably a silly error in my kernel's .config, but I can't
>>> figure out what's missing.  The boot log ends with:
>>>
>>> [    1.199004] mmcblk0: mmc0:b368  244 MiB 
>>> [    1.204422]  mmcblk0: p1
>>> [    1.326049] ata1.00: ATA-8: WDC WD20NPVT-00Z2TT0, 01.01A01, max UDMA/133
>>> [    1.332786] ata1.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>>> [    1.340896] ata1.00: configured for UDMA/133
>>> [    1.349995] scsi 0:0:0:0: Direct-Access     ATA      WDC WD20NPVT-00Z 
>>> 01.0 PQ: 0 ANSI: 5
>>> [    1.362511] VFS: Cannot open root device "sda1" or unknown-block(0,0): 
>>> error -6
>>> [    1.374684] Please append a correct "root=" boot option; here are the 
>>> available partitions:
>>> [    1.388593] b300          249856 mmcblk0  driver: mmcblk
>>> [    1.393994]   b301          220000 mmcblk0p1 0006ca47-01
>>> [    1.399368] Kernel panic - not syncing: VFS: Unable to mount root fs on 
>>> [...]
> 
>> It panics while it is still scanning the disk, looks like you need to
>> add rootwait to your kernel cmd line.
> 
> I tried rootwait but it doesn't get me further.  The bootlog ends with:

Ah, probably a classic case of not having the sd module built-in then. Make sure
scsi-disk support in your .config is set to y not m.

Regards,

Hans

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