[coreboot] VGA and Asus a8v-e_se

Rudolf Marek r.marek at assembler.cz
Tue Mar 4 23:11:13 CET 2008

Hash: SHA1

> Your instructions about both Powernow! and VGA BIOS were right on. I now
> have my Ubuntu system running with both video and frequency scaling
> after booting from coreboot. I have attached the output from "sudo lspci
> -vvvxxx" after making the above changes and booting coreboot.

Good. Please can you bit play with the peg_init?

I think you can ommit:

       /* Disable scrambling bit 6 to 1. */
        pci_write_config8(dev, 0xc0, 0x43);

and this part:

        /* Retrain link. */
        reg = pci_read_config8(dev, 0x50);
        pci_write_config8(dev, 0x50, reg | 0x20);

        reg = pci_read_config8(dev, 0x3e);
        reg |= 0x40;            /* Bus reset. */
        pci_write_config8(dev, 0x3e, reg);

        reg = pci_read_config8(dev, 0x3e);
        reg &= ~0x40;           /* Clear reset. */
        pci_write_config8(dev, 0x3e, reg);

Will it work afterwards?

Or you may try to change:
 pci_write_config8(dev, 0xe1, 0xb);


 pci_write_config8(dev, 0xe1, 0x4);

I have usually like 1 hour of free time every day (during late evening) so I
can't test too much but I can help like this.


> All of the regular PCI devices seem to be on bus 00, while the onboard
> PCIe network interface is on bus 05. The PCIe x16 card is on bus 02.
> Before I bypassed the peg_init function, all of the PCI devices except
> the Nvidia PCIe x16 video card seemed to work. When I ran lspci, it made
> no mention of any device on bus 02 or any vga or nvidia device; it did
> however see the network interface on bus 05. I neglected to save that
> output, but I can un-bypass peg_init and save the lspci output if it
> will be helpful.
> BTW, how are flash chip sizes detected? All of the images I've generated
> using coreboot or saved using flashrom on this board are 512KiB, but the
> manual indicates that it has 4MiB of flash. Is the manual lying? I'm
> curious because I'm wondering if it's possible to use a Linux payload
> with this board, but I realize that Filo or etherboot is probably
> sufficient as far as minimizing boot time. Thank you very much for your
> insight and tolerance of my limited knowledge.
> Jonathan Rogers
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