From DD-WRT Wiki
- Atheros AR7241 @ 400Mhz
- Atheros AR9287 wifi circuit
- Spansion FL032PIF 32Mbit (4Mb) Flash
- Zentel A3S56D40FTP -G5 (32Mb) Ram
 Serial Port
In the pictures above there are schematics for soldering an Serial port. The serial runs at 115200 8N1.
To get into the U-Boot prompt, you have to type >tpl< while booting.
 Flashing an alternate firmware from TFTP
First setup a TFTP server which is serving the firmware file. (Only flash "factory-to-"ddwrt/openwrt files)
Then we have to setup the network settings. Type the following things into the bootloader prompt. Replace ROUTERIP and SERVERIP with the right IPs.
setenv ipaddr ROUTERIP
setenv serverip SERVERIP
Now we have to load the firmware into the memory!. Replace FACTORY-TO-OPENWRT/DDWRT.bin with the right filename of the image!
ar7240> tftpboot 0x80000000 FACTORY-TO-OPENWRT/DDWRT.bin
You will read something like that. The size is very important. Note it. It can differ to the example.
Bytes transferred = 3932160 (3c0000 hex)
The last steps are erasing the flash and writing the new image to the right address. Replace 3c0000 with the address you noted before.
ar7240> erase 0x9f020000 +0x3c0000
ar7240> cp.b 0x80000000 0x9f020000 0x3c0000
ar7240> bootm 0x9f020000
 Hardware Hacks
I already managed to solder an USB Hub on that router, with an 7805 as power supply.
I´ll write somthing about it, next time!!