On 07/19/2010 02:33 PM, Ruslan N. Marchenko wrote: > On Mon, 19 Jul 2010, Matthias Fulz wrote: >> Coutld it be perhaps, that the VGA ROM is directly mapped to the address >> by the System Bios? >> >> Perhaps its not even a real RAM Array, instead it's a RAM address which >> leads to the VGA ROM? >> >> Any way to read this address under windows? >> Perhaps the BIOS is remapping the ATI BIOS to the address under windows, >> I would check it, if anyone knows a way to read the addresses under >> windows. > Debugger? Will try at home, though consider the fact that vanilla > catalyst from ati is not able to work with switchable graphics either, > you need to have installed OEM version of driver (from acer in my case) > which can afterwards be upgraded with vendor's driver. >
Perfect give feedback ;) >> >> >> And here is (I think the problem we have with the RO MEM Array): >> >> http://www.pcguide.com/ref/ram/umaMap-c.html >> http://www.pcguide.com/ref/ram/umaShadowing-c.html >> >> So I think we need to find a way to bypass the BIOS Shadowing. >> Best would be to do it (if possible) inside the Linux Kernel. >> > At first i think we need to confirm whether we really need it. I.e. the > problem we're trying to solve with this - to use catalyst drivers. Now, > fglrx Xorg driver is not able to load bios, which can be caused by - > a) it is dumb and just tries to read bios via /dev/mem which is intel vga > b) it fetches bios correctly but unable to parse it because of > modifications done by oem manufacturer > c) something else? > > Bioses differs with only 3 bytes - is there any checksum for integrity > verification? even one byte difference should change the whole checksum > field, given it exists. > For me it differs in more then 3 Bytes here is the cmp of my discrete bios and hybrid bios from the ati card: cmp -l atibios_hybrid atibios_single 34 321 156 456 175 300 44361 0 46 44362 0 33 44363 0 126 44364 0 5 44365 0 144 44368 0 3 44369 0 26 44371 0 60 44373 0 40 44375 0 3 44377 0 6 44385 2 6 44386 0 2 44388 74 0 44417 0 1 44500 141 101 45081 0 3 _______________________________________________ Mailing list: https://launchpad.net/~hybrid-graphics-linux Post to : [email protected] Unsubscribe : https://launchpad.net/~hybrid-graphics-linux More help : https://help.launchpad.net/ListHelp
