[Trac #688] Can't boot from usb key

[Zarro Boogs per Child]

#688: Can't boot from usb key
---------------------------------+------------------------------------------
 Reporter:  garysu               |        Owner:  wmb at firmworks.com
     Type:  defect               |       Status:  new              
 Priority:  normal               |    Milestone:  BTest-2          
Component:  ofw - open firmware  |   Resolution:                   
 Keywords:                       |  
---------------------------------+------------------------------------------
Comment (by wmb at firmworks.com):

 I suspect (with a fairly high confidence level) that the problem is due to
 the firmware  finding the wrong "disk" device when the 5in1 reader is
 plugged into a higher numbered port.  The code that creates the "disk"
 alias by searching the device tree will stop at the first "disk" device
 that it finds.  The higher numbered slots are probed later than the lower
 numbered slots, thus any "disk" devices in those slots are "more recent"
 than ones in lower numbered slots.  The search starts with the most recent
 devices, and does no distinguish between an unpopulated "disk" slot of the
 5in1 reader and a USB key "disk" (because it doesn't want to waste time by
 trying, possibly in vain, to open every possible disk).

 I question whether we should try to "fix" this problem.  The only way to
 completely fix it would require an attempt to access every potential disk
 device, which would be time-consuming and potentially a source of other
 problems.

-- 
Ticket URL: <http://dev.laptop.org/ticket/688#comment:2>
One Laptop Per Child <http://laptop.org/>