Motorola C139 V1.9.24 Won't Load from osmocom-bb

Sylvain Munaut 246tnt at
Sat Mar 22 09:55:34 UTC 2014


> ./osmocon -p /dev/ttyUSB0 -m c140
> ../../target/firmware/board/compal_e86/loader.compalram.bin
> I get the following output:
> got 7 bytes from modem, data looks like: 66 74 6d 74 6f 6f 6c  ftmtool
> Received FTMTOOL from phone, ramloader has aborted

> I would greatly appreciate any suggestions as to how I might be able to coax
> this into working.

Also, try the -c option (see bottom of )
If that doesn't work you can try some of the other -m options

If that still doesn't work, just get another phone and/or another cable.

Seriously, the compal bootloader is a piece of shit, we can't do
anything about it, and trying to remote debug serial loading issue is
a waste of our time.

If you want to debug it yourself, read the source of the osmocon tool
to see what's _supposed_ to happen, then look at the raw bytes
exchanged to see what happenned. Also look at the raw signal lines
with scope  and a logic analyzer to identify timing and signal
integrity problems. If that doesn't yield anything you might need to
dump the flash (how ? good question ... no idea what option there is
without being able to load code. jtag, or chip unsoldering ?), and
reverse engineer the boot loader to see what changed.



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