original MAC: C8:6C:87:0A:FE:54

ethaddr=00:19:CB:00:51:81
eth1addr=00:19:CB:00:51:82

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I used AA666 NSA320 sources for build on NSA310, parts of this tutorial are taken from his topic(credits to him). 

------Compilation from source-------
make menuconfig ARCH=arm
ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make uImage modules

------Prepare usb stick------
Since uboot on the NSA310 doesn't work with ethernet, it is neccesary to make an usb-stick with the neccesary files.

*Get an usb-stick with a size that supports FAT16(<4GB)
*Format it to FAT16
*Copy the needed files to the stick

------Start Debian Install------
Uboot:

Prepare u-boot for mainline kernel:
setenv mainlineLinux yes
setenv arcNumber 3339
saveenv
reset

usb start
fatload usb 0 0x800000 uImage
fatload usb 0 0xb00000 initrd.gz
setenv bootargs 'console=ttyS0,115200 root=/dev/ram initrd=0xb00000,0x900000 ramdisk=32768'
bootm 0x800000

------After install:------
fatload usb 0 0x800000 uImage

Next, try to boot and mount root filesystem.
If you installed root filesystem into /dev/sda1:

setenv bootargs 'console=ttyS0,115200 root=/dev/sda1'

bootm 0x800000

------NAND install:------
Download kernel from usb and save it into nand kernel_2 partition:
fatload usb 0 0x800000 uImage
nand erase 0x4640000 0x300000
nand write.e 0x800000 0x4640000 0x300000

Following command depands on where you installed Debian.
In case if it on sda1:
setenv bootargs 'console=ttyS0,115200 root=/dev/sda1'

Prepare boot command
setenv bootcmd 'nand read.e 0x2000000 0x04640000 0x400000; bootm 0x2000000'

saveenv

Try to boot
boot

------Fix wrong mac address------
Add these lines to /etc/rc.local:

ifdown eth1
/sbin/ifconfig eth1 hw ether XX:XX:XX:XX:XX:XX
ifup eth1

Where XX:XX:XX:XX:XX:XX is your original mac extracted from uboot's enviroment variables


------Alloc kernel panics-------
add these lines in /etc/sysctl.conf:

# Set VM min memory
vm.min_free_kbytes=8192

------Ledssssss-------
Put these lines in /etc/rc.local to stop blinking once system has booted:

#Setup leds
echo 1 > /sys/class/leds/nsa320:green:System/brightness


------Shutdown via Powerbutton-------
It is possible to shutdown the box by pressing power button.
Install input-event-daemon and put following to /etc/input-event-daemon.conf:

[Global]
listen = /dev/input/event0
[Keys]
POWER = shutdown -h now

------Known Bugs------
* Samba crashes whole system
* Ethernet leds don't work
* All mtd blocks read as bad. The chip is somehow not supported by kernel.

If somebody knows a fix, let us know :)