Openmoko Bug #1252: usb0 no longer comes up if booting with usb plugged in

[Openmoko Public Trac]

#1252: usb0 no longer comes up if booting with usb plugged in
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 Reporter:  mickey at openmoko.org  |        Owner:  tony at openmoko.com
     Type:  defect               |       Status:  reopened         
 Priority:  high                 |    Milestone:                   
Component:  System Software      |      Version:  unspecified      
 Severity:  normal               |   Resolution:                   
 Keywords:                       |     Blocking:                   
Blockedby:                       |  
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Comment(by andy):

 Hum started looking for this behaviour and there it is in my logs too.

 What it is doing is spamming D+ and D- with differential 6MHz square wave
 the whole time, AIUI this is same as transmitting 00110011... from the
 GTA02.  Host gets very confused trying to understand it after that and
 sees it as low speed, etc.

 If you force it to host mode, it shuts up, but as soon as you send it back
 to device mode it spews again.  Normally the bus should be quiet except
 for short 1ms frame signals when idle.

 Did not see any test bits in s3c2442 datasheet.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/1252#comment:11>
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