Ed Swierk wrote:
(I just spent a week working on a PowerPC-based system and am now completely spoiled by the convenience of a JTAG debugger...)
A64 certainly supports JTAG debuggers. Is there an HDT header designed onto your board? There are commercial wigglers to buy, and then you can use AMD's HDT software (from their NDA site, very powerful) or software from the commercial vendor.