Openmoko Bug #321: ftdi_eeprom often fails silently

Openmoko Public Trac bugs at docs.openmoko.org
Thu Oct 30 16:02:34 CET 2008


#321: ftdi_eeprom often fails silently
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    Reporter:  werner at openmoko.org  |        Owner:  openmoko-kernel
        Type:  defect               |       Status:  closed         
    Priority:  high                 |    Milestone:                 
   Component:  default component    |      Version:  Version 2      
    Severity:  critical             |   Resolution:  fixed          
    Keywords:                       |     Haspatch:  0              
   Blockedby:                       |    Estimated:                 
 Patchreview:                       |     Blocking:                 
Reproducible:                       |  
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Changes (by werner):

  * status:  assigned => closed
  * resolution:  => fixed


Comment:

 Oh, this was a hardware problem: the capacitative load on upstream VBUS
 was way too large, causing VBUS to collapse under the inrush current
 just at the moment when the FTDI chip tried to read from the EEPROM.

 Fixed with debug board v3.

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/321#comment:11>
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