how to install debian in pogoplugPro without ttl (2 replies)

my friend give me a pogoplugPro,i am very interinsting it ,but i have no ttl line,only can login it with shell

how can i flash uboot and install debian?thanks

~ # cat /proc/mtd
dev:    size   erasesize  name
mtd0: 08000000 00020000 "NAND 128MiB 3,3V 8-bit"
mtd1: 00e00000 00020000 "boot"
mtd2: 07200000 00020000 "rootfs"
~ # cat /etc/fw_env.config
cat: can't open '/etc/fw_env.config': No such file or directory
~ # uname -a
Linux PogoplugPro 2.6.31.6_SMP_820 #96 SMP Tue Feb 8 10:06:27 PST 2011 armv6l GNU/Linux
~ # fw_setenv
-sh: fw_setenv: not found
~ #