#8791 NORM Not Tri: Cannot boot from SD card: kernel says 'Cannot open root device "mmcblk0p1"'

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#8791: Cannot boot from SD card: kernel says 'Cannot open root device "mmcblk0p1"'
--------------------+-------------------------------------------------------
 Reporter:  ossguy  |         Owner:  dsaxena                          
     Type:  defect  |        Status:  new                              
 Priority:  normal  |     Milestone:  Not Triaged                      
Component:  kernel  |       Version:  Development build as of this date
 Keywords:          |   Next_action:  never set                        
 Verified:  0       |     Blockedby:                                   
 Blocking:          |  
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 When booting to a root filesystem on an inserted SD card using the latest
 build of the master kernel (2.6.26-20080731.1 from
 http://dev.laptop.org/~dilinger/master/), the kernel prints the following
 messages:

 {{{
 [ 3.512185] Waiting 2sec before mounting root device...
 [ 5.574603] VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0)
 [ 5.577210] Please append a correct "root=" boot option; here are the
 available partitions:
 [ 5.747213] Kernel panic - not syncing: VFS: Unable to mount root fs on
 unknown-block(0,0)
 }}}

 This has been tested with rootdelay=1 and rootdelay=30, producing the same
 results (on a previous kernel it was tested with rootdelay=2).

 The olpc.fth file used to boot from the SD card is the following:

 {{{
 \ Boot script
 " ro root=/dev/mmcblk0p1 rootdelay=1 console=ttyS0,115200 console=tty0
 fbcon=font:SUN12x22" to boot-file
 boot sd:\boot\vmlinuz
 }}}

 These results are from a G1G1 XO (C2).

 For problem reports on a similar issue using previous versions of the
 master kernel, see the following:

 http://lists.laptop.org/pipermail/devel/2008-May/013569.html [[BR]]
 http://lists.laptop.org/pipermail/devel/2008-October/020083.html

-- 
Ticket URL: <http://dev.laptop.org/ticket/8791>
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