OK, here is updated patch.
Now it takes into consideration the fact that  built-in devices and PCI 
devices see memory map
differently.
This raises question why did the built-in devices work in the first 
place. i.e. meth was using
dma_* functions for allocation, and even though dma describtors they 
return are invalid, was
working.
Only explanation I have is that (even though it's undocumented) first 
256M of RAM are visible
at offset 0 for all devices. This makes sense in a way.

Anyways, without further ado, attached is the v3 of the patch.

--
Ilya A. Volynets-Evenbakh
Total Knowledge, CTO
http://www.total-knowledge.com