Linksys WRT54GR v1.0

OEM Gemtek WRTR-136C (WRTR-136C_V02)

WRT54GR v1.x serial numbers appear to start with MK9.

Additional external links

 * On the OpenWrt Forums

Pinout
CON1 (GND) (RxD) (GND) (VCC) (VCC) [TxD]

cat /proc/cpuinfo
processor      : 0 vendor_id      : CyrixInstead cpu family     : 4 model          : 1 model name     : Cx486SLC stepping       : unknown fdiv_bug       : no hlt_bug         : no f00f_bug        : no coma_bug        : no fpu             : no fpu_exception   : no cpuid level     : -1 wp             : yes flags          : bogomips       : 49.86
 * 1) cat /proc/cpuinfo

cat /proc/version
Linux version 2.4.29 (tom@localhost) (gcc version 3.4.1) #146 Mon Jan 23 02:44:10 EST 2006
 * 1) cat /proc/version

cat /proc/cmdline
console=ttyS0,38400 root=/dev/mtdblock1 noinitrd
 * 1) cat cmdline

lsmod
Module                 Size  Used by rt61ap                192952   2 RDC_reboot              644   0 (unused) resetDefault           1012   0 (unused)
 * 1) lsmod

ps aux
PID Uid     VmSize Stat Command 1 0          228 S   /bin/init 2 0              SW  [keventd] 3 0              SWN [ksoftirqd_CPU0] 4 0              SW  [kswapd] 5 0              SW  [bdflush] 6 0              SW  [kupdated] 9 0          320 S   /bin/sh 24 0          248 S < resetC 51 0          240 S   httpd 55 0          264 S   syslogd 60 0          332 S < httpd 62 0          208 S   easyconf 192.168.1.1 234.2.2.9 14675 67 0          244 S   /bin/tftpd 68 0          216 S   /usr/sbin/udhcpd /tmp/udhcpd.conf 71 0          848 S   /usr/sbin/udhcpd /tmp/udhcpd.conf 81 0         1172 S   /usr/sbin/upnp -D -L br0 -W eth0 87 0          784 S   wan_connect 105 0          284 R   ps aux
 * 1) ps aux

cat /proc/bus/pci/devices
0000   17f36020        0       00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000 0008   18140401        c       d5000000        00000000        00000000        00000000        00000000        00000000        00000000        00008000        00000000        00000000        00000000        00000000        00000000        00000000        rt61 0038   17f36030        0       00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000        00000000 0040   17f36040        a       0000e801        d1900000        00000000        00000000        00000000        00000000        00000000        00000100        00000100        00000000        00000000        00000000        00000000        00000000        r6040 0048   17f36040        b       0000e901        d2900000        00000000        00000000        00000000        00000000        00000000        00000100        00000100        00000000        00000000        00000000        00000000        00000000        r6040 0050   17f36060        f       d5900000        00000000        00000000        00000000        00000000        00000000        00000000        00001000        00000000        00000000        00000000        00000000        00000000        00000000 0051   17f36061        e       d4900000        00000000        00000000        00000000        00000000        00000000        00000000        00001000        00000000        00000000        00000000        00000000        00000000        00000000
 * 1) cat devices