Messages in this thread | | | Subject | Re: Cyrix IRQ routing is wrong? | From | Christer Weinigel <> | Date | 05 Jul 2002 17:02:26 +0200 |
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Rob van Nieuwkerk <robn@verdi.et.tudelft.nl> writes: > PS: anyone else seeing screen corruption in console/text mode with these > boards ? (some chracters from before a screen update stay on the screen). > > board: > ------ > Axiom Technology, SBC84510VEE, 3.5" Capa board, 300 MHz Geode
The Geode doesn't really have a text mode, VGA is simulated in SMI mode by the "VSA BIOS", which is more or less buggy depending on what exact BIOS revision you are using. In text mode, each byte written to the screen will result in a SMI interrupt that then draws into the real hardware frame buffer.
My suggestion is to never ever use the text mode on a Geode platform and instead use the VESA framebuffer to seleect a framebuffer mode that is directly supported by the hardware. That way mode, only modifications of the resolution or the palette will result in SMI interrupts and that code does not seem to be as buggy as the text mode emulation.
/Christer
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