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Athlon has bugs?

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by dachev

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I am writing a simple operating system in my free time and I have encountered a very strange situation - I have code, which runs on 23 (this far) different machines including P MMX, PII, PIII and K6-2, but every Athlon I run it on gives #GP - the timer handler is via task gate and when I send interrupt acknowledge to the controler, the CPU curiously regenerates the interrupt and tryes to reenter the task, resulting in #GP. This is tested on one Athlon 600Mhz and 2 T-BIRDS on 800Mhz with very different hardware configurations - they all do the same mistake.

Does anybody know anything about bugs in Athlon, or features AMD added to it and did not tell about them in their manuals? I have examined the documentation at their site - all they say is this CPU is fully compatible...

I can give you the source if you wish to try it..

2 replies

by ebob

Please post to Tech Q&A where you're more likely to get some useful help.

I assume you've checked the AMD website, and confirmed that the test boxes are running latest patches.

by dachev

It is not like seeking help - it is reporting a bug, and I am serious and I had already proved it - another Athlon gave the same #GP. And did I mention I write the operating system? What paches do you talk about??? The only patches aplicable here are microcode-level ones (like you know what microcode is) and this means only one thing - a bug.

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