Recover rcS from Marvell or CE prompt?

Hello all,
I tried to add new lines in rcS file but it seems the rcS is corrupted and I lost the network access. Then I used serial to monitor and I got error info: rcS not exist... but it gets to the PogoPlug prompt too. I went to /etc/init.d folder and I can see rcS file is there and a copy of it before changing rcS.copy.

My device is PogoPlug, then I use:
mount -o rw,remount /
but it says that ... I forget what the error message.

So I think even I am in shell prompt but I may lost most of the functions.

My question is can I make the system writable from Marvell or CE prompt and copy files so that I can recover the rcS file?

Thanks!
zhaozh

You cannot possibly edit contents of the root file system from the u-boot bootloader. Do it from desktop linux.