I just booted the "git.xilinx.com/Linux-2.6-xlnx" source code to a login prompt last week. I'm using Xilinx EDK 9.2 and ELDK 4.1 crosstools (uclib version) and Ubuntu 7.10 workstation as my host OS (under VMware). The easiest path is to use the Uartlite driver (and disable the 82550 stuff because the stand directory will not compile currently, there is a patch somewhere on the last from last Jan about what defines are missing but you can just use uartlite instead). Be sure to use the correct reference design (I started with the Virtex4_PPC_Example_9_2.zip in EDK/EDKexamples directory). Add the sysace driver into the design and (w/ interrupts on) and make sure you have uartlite selected (with interrupts on). Build the design and use the xparameters_403.h file to build your kernel. In this case, be sure to turn on uartlite console support and turn off 82550 console support or your kernel will not work. Also be sure to add Ext3 filesystem to your kernel config. Once you add the sysace driver support, you can then create a ace file and replace their kernel on the compact flash and boot it to their root filesystem (works, I just did it). This gets you a full booted kernel on a working root filesystem with min work.
For references see: http://wiki.secretlab.ca/index.php/Linux_on_Xilinx_Virtex http://simfami.marlab.ac.uk/piprg/wiki/index.php?title=Installing_Linux_ Kernel_2.6.23_on_the_PPC405_core_of_a_Xilinx_ML403_board --phil
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