#9449 NORM 1.5-CTe: Laptop reboots on first resume

[Zarro Boogs per Child]

#9449: Laptop reboots on first resume
------------------------------------+---------------------------------------
           Reporter:  wad           |       Owner:  wad          
               Type:  defect        |      Status:  new          
           Priority:  normal        |   Milestone:  1.5-CTest    
          Component:  not assigned  |     Version:  not specified
         Resolution:                |    Keywords:               
        Next_action:  diagnose      |    Verified:  1            
Deployment_affected:                |   Blockedby:               
           Blocking:                |  
------------------------------------+---------------------------------------

Comment(by wmb at firmworks.com):

 Try dev.laptop.org:~wmb/q3a10e.rom

 It sets a bit that prevents the PLL from being turned off in suspend
 state.  I found a sentence in the Bios Porting Notes document (neither the
 PM_VX855 nor the PG_VX855 manual, yet a third document) that says that bit
 must be set before suspend.  Apparently they mean it.

 I haven't experience a resume crash since setting that bit, in quite a few
 tries on my A2 board that used to fail fairly frequently.

 By the way, one more data point - I dumped the memory controller registers
 at the failure point and found that they were at their default values
 instead of holding the previously-set values (which they do on a
 successful resume).

-- 
Ticket URL: <http://dev.laptop.org/ticket/9449#comment:5>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system