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NOTE! The string found in /proc/cpuinfo IS NOT A RELIABLE INDICATOR OF WHICH HARDWARE YOU HAVE! [citation needed -- for shipping A5 and A6 PCBs it should be perfectly reliable]

For all methods, you will need to login via USB Networking or otherwise SSH into your FreeRunner, and find the hardware revision using one of the following methods:

/proc/cpuinfo

root@om-gta02:~# cat /proc/cpuinfo
.
.
.
Hardware	: GTA02
Revision	: 0350

The line that says "Revision" is the one you want. The "03" means it's a FreeRunner, and the "05" indicates the hardware revision, in this case revision 05.

Caution: may be wrong for hardware versions earlier than 05, or for u-boot earlier than about June, 2008.

Using libgsmd-tool

root@om-gta02:~# libgsmd-tool -m shell
libgsm-tool - (C) 2006-2007 by Harald Welte and Openmoko, Inc.
This program is Free Software and has ABSOLUTELY NO WARRANTY

rv
# # Get revision
revision: "HW: GTA02BV5, GSM:
gsm_ac_gp_fd_pu_em_cph_ds_vc_cal35_ri_36_amd8_ts0-Moko8"

FSO

If your are running fso, you can use mickeyterm and the at+cgmr command. Or you can use mdbus, like this:

root@om-gta01:~# mdbus -s org.freesmartphone.ogsmd /org/freesmartphone/GSM/Device org.freesmartphone.GSM.Device.GetInfo

The result will be something like this:

/org/freesmartphone/GSM/Device: GetInfo ->  dbus.Dictionary({dbus.String(u'imei'): dbus.String(u'nnnnnnnnnnnnnnn',
 variant_level=1), dbus.String(u'model'): 
dbus.String(u'Neo1973 GTA01 Embedded GSM Modem', variant_level=1), dbus.String(u'revision'):
dbus.String(u'HW: GTA01Bv4, GSM: gsm_ac_gp_fd_pu_em_cph_ds_vc_cal35_ri_36_amd8_ts0-Moko1', variant_level=1), 
dbus.String(u'manufacturer'): dbus.String(u'FIC/OpenMoko', variant_level=1)}, signature=dbus.Signature('sv'))

Where 'nnnnnnnnnnnnnnn' is you IMEI.