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I have a TP-Link 703n.  This is the router used in the Avalon ASIC device.

This router has a USB port, and I think it should be possible to boot openWRT from a USB-Flash.  I am not set up to de-brick my device, however.  In addition, I have never built openWRT.

I am hoping that someone has already done this.

You shouldn't have to build OpenWrt.  Check out the wiki: http://wiki.openwrt.org/toh/tp-link/tl-wr703n

Also, here is a terrific, image-documented guide for flashing (and deciphering the Chinese interface): http://www.madox.net/blog/projects/tp-link-tl-wr703n/

I used the images from openwrt.org, not any listed on the madox.net site.

I have several of these, all v1.6.  You might need to pop open the case and look for some internal markings/stickers to verify the version number or check the build version listed in the Chinese firmware.

I can't provide any assistance related to the Avalons, and I'm surely not anything more than a casual user of OpenWrt, but I'll try to answer any more questions that you might have.

I'm sure you've already seen this but in case you haven't: http://wiki.openwrt.org/doc/howto/generic.flashing

You might consider flashing over ethernet vs usb using the bootloader option. I haven't done this on the Avalon but IMO it is a superior method of flashing routers with less chance of bricking.

I wasn't going to flash from usb, I was going to use USB as secondary storage.

It is a v 1.7 device that says v 1.6 on the outside label.
It is running the latest Avalon OpenWRT + mods system.  It is just a test-bed / sandbox / backup.

The 32 Mb is mostly filled up.  I vaguely think if the filesystem is moved to a 16 GB USB-Flash, I will have more room to play.

I want to do some things that are not supported by Avalon, such as add IPv6 support.  Also, a 300 MHz MIPS processor with 16GB Flash-disk and 32 Mb RAM is an impressive little machine, even if it does cost pocket money and fit in the palm of the hand.

Is this what you're trying to do?

http://h-wrt.com/en/doc/flash