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
---------------------------------+------------------------------------------
 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:                       |  
---------------------------------+------------------------------------------

Comment(by werner):

 Nitpicking: a 6MHz wave would be a 01010101 sequence. Since USB is using a
 NRZI encoding, this would be a stream of 0 bits at the layer above
 encoding.
 (See also USB 2.0 spec, section 7.1.8, page 157.)

 Unfortunately, there's no bit stuffing when sending a stream of zeroes, so
 you can't tell by looking at the bit stream whether this is originally a
 square wave or a lot of zeroes. Presumably the latter.

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/1252#comment:15>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac