I recently had reason to convert the latest DD-WRT firmware .bin file to .trx format, so that I could manually flash my WRT54GL. Not wanting to risk it, I first converted the .bin image with the following command:
dd if=firmware.bin of=firmware.trx bs=32 skip=1
Which I found here.
No Comments on "Converting a .BIN file to .TRX for OpenWRT / DD-WRT"