#11872 NORM Not Tri: 12.1: USB boot broken on XO-1.75, SD card boot broken on XO-1 (was: 12.1: USB boot broken on XO-1.75)

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#11872: 12.1: USB boot broken on XO-1.75, SD card boot broken on XO-1
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           Reporter:  sascha_silbe  |       Owner:                                   
               Type:  defect        |      Status:  new                              
           Priority:  normal        |   Milestone:  Not Triaged                      
          Component:  not assigned  |     Version:  Development build as of this date
         Resolution:                |    Keywords:                                   
        Next_action:  never set     |    Verified:  0                                
Deployment_affected:                |   Blockedby:                                   
           Blocking:                |  
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Comment(by sascha_silbe):

 Same problem with SD card boot on XO-1 (using a custom image very similar
 to OLPC OS 12.1 build 10/11 as there are no XO-1 SD card images for the
 official builds), but USB boot works fine there. I wonder why it's exactly
 the opposite of XO-1.75 (where SD card boot is working and USB boot is
 failing).

 Serial console log excerpt:
 {{{
 [    2.595658] Write protecting the kernel read-only data: 936k
 [    2.625376] mmc0: new SDHC card at address b368
 [    2.676107] mmcblk0: mmc0:b368 SDC   3.84 GiB
 [    2.724358]  mmcblk0: p1 p2
 [    2.792011] dracut: dracut-017-62.git20120322.fc17
 [    2.832416] dracut: FATAL: No or empty root= argument
 [    2.859462] dracut: Refusing to continue
 [    2.926288] dracut Warning: Signal caught!
 [    2.971348] dracut Warning: dracut: FATAL: No or empty root= argument
 [    3.017936] dracut Warning: dracut: Refusing to continue
 [    3.083585] Kernel panic - not syncing: Attempted to kill init!
 }}}

 Media used: Sandisk 4GB class 4 microSD a) with full-size adapter in
 external SD card slot, b) in Silicon Power microSD card reader.

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Ticket URL: <http://dev.laptop.org/ticket/11872#comment:2>
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