Openmoko Bug #2217: Noise screen of death: Freerunner looses SDIO connection

[Openmoko Public Trac]

#2217: Noise screen of death: Freerunner looses SDIO connection
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 Reporter:  xbaldauf         |          Owner:  openmoko-kernel
     Type:  defect           |         Status:  new            
 Priority:  normal           |      Milestone:                 
Component:  System Software  |        Version:                 
 Severity:  major            |       Keywords:                 
 Haspatch:  0                |      Blockedby:                 
Estimated:                   |    Patchreview:                 
 Blocking:                   |   Reproducible:                 
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Comment(by andy):

 I think this can be due to process spread of Glamo meaning that not every
 device can handle the 89MHz memory clock that is used in 2.6.28.

 I have seen this symptom when working wth Glamo registers but don't see it
 on devices with kernels from the last few months.  If you pretty reliably
 can reproduce it, it will be something about your GTA02 I think.

 The problem is actually communication to Glamo internal SDRAM is broken,
 and as the MMC traffic travels through that it is also broken.

 I'll add a kernel commandline option to push this back to 80MHz from 89MHz
 (although the 89MHz was recommended by SMedia) so we can test and see if
 makes any change for you.

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2217#comment:1>
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