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List:       olpc-bugs
Subject:    Re: #12751 NORM Future : XO-4 CP tag does not work first try
From:       "Zarro Boogs per Child" <bugtracker () laptop ! org>
Date:       2014-02-26 3:41:11
Message-ID: 044.f13f7471da05a400d9f196b651a59568 () laptop ! org
[Download RAW message or body]

#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


Comment:

 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
 corrupt.

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

-- 
Ticket URL: <http://dev.laptop.org/ticket/12751#comment:3>
One Laptop Per Child <http://laptop.org/>
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