The only "Hornet" I know of is not a "chip" but an AR9331-based router from ALFA Network:http://wiki.openwrt.org/toh/alfa.network/hornet-ub.....So, what is exactly under the shield?
The schematic seems fairly complete to me http://arduino.cc/en/uploads/Main/arduino-Yun-schematic.pdfThe RAM for instance is on the last page of the pdf ...
I guess the WIFI module with the shield may be similar to WR703n, the one you once did the reverse engineer on it(Very amazing, and so appreciate).
I don't see any special on arduino yun schematic, biggest difference maybe the USB-Hub chip intergrated with the SD card reader.
Thanks for what you did on the RT5350 chip to make openwrt run on it.
This might help answer some questions....?Adafruit's "Ask an Engineer" show w/ guest Massimo Banzi. They start talking about Yun, and what's beneath the metal shield at around the 17 minute mark. http://youtube.com/watch?v=3dtnu-neRUo
I think that if you wanna see the schematic you'd better go to SoC development platform, something like "evalue board", which comes with schematic and such a detailed hw stuff. "Carambola" boards may be interesting.
About WR703N i think it is a toy, poor ram (32Mbyte), poor flash(4Mb), hardcoded uboot's env, no good at all! Also only 2 usable gpio.
From my point of view the SoC is just an accessory around arduino, something like the wifi shield, so you could see it as "black box", something you can talk through the bridge on the serial port. Also, why do you want to toy with a very complicated piece of hardware ? Soldering and handling the Atheros SoC is not a piece of cake, so any really reason to have much more details about.
p.s.also you can appreciate how pretty complicated is the firmware on the uboot side, just have a look about the early boot, DDR stuff, TLB, etc, 10000:1 the complexness of arduino bootloader, so you can't really think to handle a so complicated object from scratches, simply silly, not possible for hobby! May be possible for a skilled team, but we are speaking of a job task.
Maybe if you contact Dog Hunter, they can provide more information? (Their website is really lacking...)http://doghunter.org/contact.html
The boards can be built by hand or purchased preassembled; the software can be downloaded for free. The hardware reference designs (CAD files) are available under an open-source license, you are free to adapt them to your needs.