Although Sheevaplug has appeared to be not particularly reliable piece of hardware (this claim is based on personal experience and numerous reports of other users), it is a great fun as well, so I gave it next (the last one) chance and have bought another new plug to replace the broken one.

I planned to use SDHC card with Debian which worked seamessly with my previous plug computer, so I follow the procedure described below.

Connect PC to Sheevaplug with USB-miniUSB cable

Turn on the plug computer.

Run cu:

cu -s 115200 -l /dev/ttyUSB0

press any key. In response to boot loader prompt type:

Marvel>> version
U-Boot 1.1.4 (Dec 27 2009 - 22:03:21) Marvell version: 3.4.27

The u-boot boot loader have to be upgraded before installing Debian (cf. http://www.cyrius.com/debian/kirkwood/sheevaplug/uboot-upgrade.html).

Copy the U-Boot binary u-boot.kwb to a USB stick formated with the FAT filesystem.

Plug the USB stick into a plug computer, connect the serial console and type the following commands:

usb start
fatload usb 0:1 0x0800000 u-boot.kwb
nand erase 0x0 0x60000
nand write 0x0800000 0x0 0x60000

Regardless of how U-Boot was installed, one have to restart the machine to load the new version of U-Boot:

reset

Boot the system (cf. http://www.cyrius.com/debian/kirkwood/sheevaplug/unpack.html).

Configure the boot loader now. First of all, one has to change a setting so the device will boot the kernel which is used by Debian:

setenv mainlineLinux yes
setenv arcNumber 2097
saveenv
reset

Restart the device so the changes will take effect. Now configure the machine to boot:

setenv bootargs_console console=ttyS0,115200
setenv bootargs_root 'root=/dev/mmcblk0p2'
setenv bootcmd_mmc 'mmc init; ext2load mmc 0:1 0x00800000 /uImage; ext2load mmc 0:1 0x01100000 /uInitrd'
setenv bootcmd 'setenv bootargs $(bootargs_console) $(bootargs_root); run bootcmd_mmc; bootm 0x00800000 0x01100000'
saveenv

At this point SheevaPlug is ready to boot Debian automatically from SD card. So, I inserted my SDHC card with Debian 5.0 installed some 2 years ago and tried to connect via ssh.

ssh -l <user> 192.168.1.88

Linux neptune.pinkaccordions.org 2.6.30-5-kirkwood #1 Wed Jan 12 15:27:07 UTC 2011 armv5tel

System is up and running so it seems reusing SDHC card with old Debian installation was sucessfull, but shortly I discovered there were problems...

System clock is terribly fast and there are problems communicating with USB port. Upon consulting google I have discovered kernel upgrade is recommended (cf. http://www.cyrius.com/debian/kirkwood/sheevaplug/boot.html and http://www.cyrius.com/journal/debian/kirkwood/sheevaplug/):

apt-get update
apt-get dist-upgrade
flash-kernel     

First command generated lots of 404 errors because Lenny is not supported anymore (I was not aware of that). I decided not to upgrade to Lenny and fixed /etc/apt/sources.list instead (cf. http://superuser.com/questions/404806/did-debian-lenny-repositories-vanish):

deb http://archive.debian.org/debian/ lenny main non-free contrib
deb-src http://archive.debian.org/debian/ lenny main non-free contrib
# Volatile:
deb http://archive.debian.org/debian-volatile lenny/volatile main contrib non-free
deb-src http://archive.debian.org/debian-volatile lenny/volatile main contrib non-free
# Backports:
deb http://archive.debian.org/debian-backports lenny-backports main contrib non-free
# Previously announced security updates:
deb http://archive.debian.org/debian-security lenny/updates main

Then, apt-get dist-upgrade and flash-kernel was completed without errors.

After reboot, system works fine. I plan to upgrade it to Squeeze in the nearest future.

The moral from the story is: with God's and Google help one has not to be an expert to cope with running Linux.