AMD Alchemy is a processor developped by AMD focused on small Web/Network applicances.

See the TableOfHardware for supported AMD Alchemy routers.

See InstallingAlchemy if you are brave enough to test it.

The support for AMD Alchemy is completed :

• The images are working and you can do some more testing

The bootloader is Yamon, and supports TFTP booting. The firmware can only be booted when it is in SREC format. OpenWrt images are in the right format already.

Since the board is really well supported with both Linux 2.4 and 2.6, you can test the firmware built with kamikaze and report any problems you may encounter.

The YAMON bootloader allows you to either run a kernel in RAM (for testing purpose), or a filesystem in RAM, or both, but you can also write these two components on the flash.

Once you have YAMON access just :

load /

Then modify the

start

variable in order to load the kernel in ram and not on the flash, for that do :

go . rootfstype= init=

Almost same thing as before, except that you are likely to use either the

$start

variable, or the

go

command after having loaded your filesystem via

load

First you need to erase the two sections of the flash which contain filesystem and kernel :

erase 0xbfd00000 0xf0000
erase -s
load 

This will first erase the kernel, then filesystem, the box will reboot, and next time you load a combined image, it will be written to the flash.

Almos the same idea as before :

erase 0xbfd00000 0xf0000
load 

Next time you load a kernel via TFTP it will be written in the flash

Once again, almost the same thing :

erase -s system
load 

Mode-specific information can be found on that model's page. See CategoryAlchemyDevice.

The JTAG is an EJTAG and can be easily accessible :

http://www.meshcube.org/meshwiki/DebugConnector?action=AttachFile&do=get&target=connectors.png

The 12-pin connectors superposes a serial console, and a JTAG interface :

http://www.meshcube.org/meshwiki/DebugConnector?action=AttachFile&do=get&target=debug-pinout.png

Here is the pinout :

01	TXD (3.3v)	serial
02	RXD (3.3v)	serial
03	VCC (3.3v)
04	TCK	EJTAG
05	RST#	EJTAG
06	TMS	EJTAG
07	DINT	EJTAG
08	TDO	EJTAG
09	GND
10	TDI	EJTAG
11	GND
12	TRST	EJTAG

Standard EJTAG interface, as the one you can build for a WRT54G will work. Same thing for the serial port.

Happy debugging !

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CategoryOpenWrtPort