2 messages, 2 authors, 2001-02-14 · open the first message on its own page
From: Patrik Olesen <hidden>
Date: 2001-02-14 08:43:57
What do I need to run graphics on a MBX860 card? Is it possible to use a standard VGA card connected to PCI and then run Xlib? If so, what requirements has such a configuration regarding RAM, ROM and CPU / Patrik ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
From: Gabriel Paubert <hidden>
Date: 2001-02-14 16:56:30
On Wed, 14 Feb 2001, Patrik Olesen wrote:
What do I need to run graphics on a MBX860 card? Is it possible to use a standard VGA card connected to PCI and then run Xlib?
Blatant plug: one of the problems may be to initialize the board. I have an x86 ROM BIOS emulator which does the job quite nicely on my S3 boards. It's even embedded in a bootloader (prepboot) and rather small for an emulator (approx 24k). Once the board has been correctly setup, standard libs should work
If so, what requirements has such a configuration regarding RAM, ROM and CPU...
You need a way to access ISA VGA addresses (0xa0000-0xbffff), and ISA I/O addresses for VGA. Beware of conflicts, especially with S3, which uses a bunch of I/O addresses of the form 0x2e8+n*0x400 (inherited from IBM's 8514 AFAICT). My solution is that the PCI devices are allocated I/O addresses starting from 0x10000. The ROM only has to be virtually located at 0xc0000 for it to work. I copy ROM to RAM to accelerate the emulator and then play with memory management to build a PC low 1Mb memory map. The ROM BIOS on my machine uses standard PC ports 0x42-43 and 0x61 for timing purposes. I don't have any problem since these devices exist on PreP machines, but if you don't have them, you'll have to emulate the 8253. Gabriel. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/