Ronald G Minnich wrote:
keep in mind that, if it works on one *instance* of a card from vendor X, it may fail on the same model card from vendor X, purchased on the same day, from the same store, on the same shelf.
PC hardware is wonderful.
Thanks. I will run a trace and see first how large it is (100's or 1000's of cycles). Maybe there are pci cycles that are checking from flags to be set on the vga chipset, and these could explain the behavior differences you are mentionning, in case the flags hasn't changed to the expected value before the init process goes on. Or timings between cycles that need to be respected. I think I can write some perl script that will extract these informations from the analyser trace and produce the right C code. I hope the pci graphic card doesn't rise interrupts during that process though.. -jfs
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