#12751 NORM Future : XO-4 CP tag does not work first try

Zarro Boogs per Child bugtracker at laptop.org
Tue Feb 25 22:41:11 EST 2014

#12751: XO-4 CP tag does not work first try
           Reporter:  Quozl                |       Owner:  Quozl               
               Type:  defect               |      Status:  new                 
           Priority:  normal               |   Milestone:  Future Release      
          Component:  ofw - open firmware  |     Version:  Development firmware
         Resolution:                       |    Keywords:                      
        Next_action:  add to build         |    Verified:  0                   
Deployment_affected:                       |   Blockedby:                      
           Blocking:                       |  
Changes (by Quozl):

  * next_action:  diagnose => add to build


 It was a bug in Open Firmware.

 ''edi-open-active'' broke stack balance by returning 0 when the EC had
 been freshly powered up.  This caused invalid data to be written to the EC
 flags page.  Invalid data is ignored by the EC and treated as CP tag not
 present.  A subsequent reprogramming would succeed because stack was not

 Fixed in [http://tracker.coreboot.org/trac/openfirmware/changeset/3713 SVN

Ticket URL: <http://dev.laptop.org/ticket/12751#comment:3>
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