#12525 NORM 4-firmw: XO-4 EC communication problem

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#12525: XO-4 EC communication problem
-------------------------------------------+--------------------------------
           Reporter:  wad                  |       Owner:  rsmith                            
               Type:  defect               |      Status:  new                               
           Priority:  normal               |   Milestone:  4-firmware                        
          Component:  embedded controller  |     Version:  Development source as of this date
         Resolution:                       |    Keywords:  XO-4, EC                          
        Next_action:  diagnose             |    Verified:  0                                 
Deployment_affected:                       |   Blockedby:                                    
           Blocking:                       |  
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Comment(by pgf):

 just happened to me:

 /proc/interrupts shows 1 increment per repetition of
 {{{
 [  724.081141] olpc-ec-1.75: EC cmd error: timeout in STATE 2
 [  724.086793] power_supply olpc-battery: driver failed to report
 `present' property: 4294967186
 [  724.095274] olpc-ec-1.75: transmit FIFO not empty, resetting
 }}}

 on the EC, with S67, we get this:

 {{{
 >1782851:SDI switchwait noack
 1782853:SDI=3, got_ack (0,213), CMD 0

 [ 1 second pause, nothing happens on kernel side]

 >1783829:Cmd
 1783830:CMD Switch
 sent 0001 got 7000
 1783834:SDI=5, got_ack (0,213), CMD 1
 1783838:nocmd

 [when these 5 lines are printed, kernel prints its 3 lines]

 [ 3 second pause, repeat ]
 }}}

-- 
Ticket URL: <http://dev.laptop.org/ticket/12525#comment:4>
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