Openmoko Bug #2257: gsm0710muxd: "Modem does not respond to AT commands"

[Openmoko Public Trac]

#2257: gsm0710muxd: "Modem does not respond to AT commands"
-----------------------------+----------------------------------------------
 Reporter:  lindi            |          Owner:  openmoko-kernel
     Type:  defect           |         Status:  new            
 Priority:  normal           |      Milestone:                 
Component:  System Software  |        Version:  unspecified    
 Severity:  normal           |       Keywords:                 
 Haspatch:  0                |      Blockedby:                 
Estimated:                   |    Patchreview:                 
 Blocking:                   |   Reproducible:                 
-----------------------------+----------------------------------------------
 calypso/ttySAC0 seems to sometimes go to a state where even repeated
 invocations of gsm0710muxd fail with "Modem does not respond to AT
 commands". However, if I "echo 0 > power_on; sleep 3; echo 1 > power_on;
 echo 1 > reset" I can use

 {{{
 socat - file:/dev/ttySAC0,crtscts,crnl,b115200
 }}}

 just fine to talk to the modem. After that also gsm0710muxd is able to
 talk to it.

 I am using gsm0710muxd abcbcd7cc532a8834906de3fc24c8f8fe7643cd4 and kernel
 from andy-tracking c1b03e4da22e8dd7a6caccb9e39a9201535ced11

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2257>
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