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This article Based on work by naxalite, wth, frontalot, and noName. Originally by frontalot. at

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Some of these commands have not yet been tested on the mipsel-hdhlan LinkStation. Please report any differences

The MIPSel LS2 actually does not contain an AVR (other LS versions do). AVRs are microcontrollers from Atmel and an Atmel brand, while the LS2 contains a Freescale (Motorola) microcontroller MC68HC908JL8, which is based upon the Motorola 6808 microprocessor, which is a decendant of the classic Motorola 6800 microprocessor, first released in 1975 at the dawn of microprocessors.

The microcontroller serves the same purpose as the AVRs in other LinkStation models. It controls much of the LinkStation hardware, including the power button and LED indicator. It is controlled by the commands sent to /dev/ttyS0.

To send commands to the microcontroller use e.g.:

echo -n "commands" > /dev/ttyS0
Command Action/Code
\30\30\30\30 Stops smbd and atalkd if /dev/hda3 is not mounted to /mnt. Sent by /www/script/
[[[[ Starts slowly blinking power LED (sleep).
]]]] High-speed cooling fan rotation.
\\\\ Low-speed cooling fan rotation.
>>>> Unknown. Sent by mc_ctld on boot.
AAAA Unknown. Sent by mc_ctld on boot.
CCCC Sent by shutdown -r now (reboot).
EEEE Sent by shutdown -h now (halt).
FFFF Unknown. Sent by mc_ctld on boot.
JJJJ Unknown. Sent by mc_ctld on boot.
KKKK Unknown. Sent by mc_ctld on boot.
QQQQ Unknown. Sent by mc_ctld on set timer.
RRRR End of clear flash memory.
SSSS Start of clear flash memory and /www/script/ Sent by /www/script/
TTTT Flash memory update completed (stops blinking power, disk full, and diagnostic LEDs).
UUUU Flash memory update started (starts blinking power, disk full, and diagnostic LEDs).
VVVV Turns off disk full LED.
WWWW Turns on disk full LED.
XXXX Stops blinking disk full LED.
YYYY Starts blinking disk full LED.
ZZZZ Stops slowly blinking power LED. Sent by mc_ctld.
gggg Diagnostic LED blinks 3 times and system shutdown (partition error).
iiii Diagnostic LED blinks 4 times and system shutdown (cooling fan error).
kkkk Diagnostic LED blinks 5 times and system powers off (flash memory error).
mmmm Diagnostic LED blinks 6 times and system shutdown (hard drive or mc_ctld error).
oooo Diagnostic LED blinks 7 times and system shutdown (RAM, NIC, or HDD controller error).

Most of this information courtesy of