How to determine gta04 hardware revision?

Nikita V. Youshchenko yoush at
Mon Jul 15 11:17:07 CEST 2013

> If you want to see the revision for informational purposes:
> dmesg | fgrep Revision

Relying on dmesg immediately makes software unreliable, since kernel log 
buffer may overflow

> Since the A3 board also lacks a mechanism to on/off the UMTS modem you
> can check for the presence of the GPIO that controls it:
> ls -l /sys/class/gpio/gpio186

Relying on GPIO number does not look good as well - numbers tent to be 
dynamic and change over time. Need to read something immutable (and kernel 
should provide that).


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