[Trac #1161] Sporadic SPI FLASH write failures

[Zarro Boogs per Child]

#1161: Sporadic SPI FLASH write failures
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 Reporter:  wmb at firmworks.com    |       Owner:  wmb at firmworks.com
     Type:  defect               |      Status:  new              
 Priority:  normal               |   Milestone:  Untriaged        
Component:  ofw - open firmware  |    Keywords:                   
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 On a B2, I used the "flash" command and got a "Verify failed" message.  It
 happened after a "copy-nand" command but I'm not sure that is actually
 relevant.  The SPI FLASH part was manufactured by Winbond.

 I had a serial port, so I diagnosed the problem to the fact that the SPI
 FLASH status register contained the value 0xfc instead of the more usual
 value 0.  That value means write-protect.  The previous attempt to "flash"
 had not written or erased anything; the original contents of the SPI FLASH
 were intact.

 I wrote the status register back to 0 and the next "flash" command
 succeeded.

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Ticket URL: <http://dev.laptop.org/ticket/1161>
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