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Harald Welte laforge at gnumonks.orgJust another intermediate update: 1) I've pushed my current debugging code to the uart-debug branch Simply run osmocon + layer23 and the hello_world.bin image. layer23 will send a 62 byte sized HLDC message every 10 seconds to the phone, and various instances of the code will print what they see. The payload of the packet is supposed to be 0a 00 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07 00 01 02 03 04 05 but what the firmware sees is: 0a 00 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 06 07 02 03 04 05 So as you can see, every '00 01' sequence has been chopped out, despite 10ms delays between the characters. If you change the payload to not include zero-bytes, all bytes are received fine. 2) Enabling various misc UART interrupt sources and checking for error conditions in LSR does not help Regards, Harald -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)