[LinuxBIOS] RE : Re: VGA bios and i/o access for powerpc
jfaslist at yahoo.fr
Thu Sep 7 17:55:46 CEST 2006
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..
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