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Date: Sun, 16 Jan 2005 21:37:41 +1100
From: Dave Airlie <airlied@gmail.com>
Reply-To: Dave Airlie <airlied@gmail.com>
To: Jon Smirl <jonsmirl@gmail.com>
Subject: Re: 2.6.10 dies when X tries to initialize PCI radeon 9200 SE
Cc: Helge Hafting <helgehaf@aitel.hist.no>, covici@ccs.covici.com,
       Kernel Mailing List <linux-kernel@vger.kernel.org>
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> 
>         /* There are signatures in BIOS and PCI-SSID for a PCI card,
> but they are not very reliable.
>         Following detection method works for all cards tested so far.
>         Note, checking AGP_ENABLE bit after drmAgpEnable call can also
> give the correct result.
>         However, calling drmAgpEnable on a PCI card can cause some
> strange lockup when the server
>         restarts next time.
>         */
>         pci_read_config_dword(dev->pdev, RADEON_AGP_COMMAND_PCI_CONFIG, &save);
>         pci_write_config_dword(dev->pdev, RADEON_AGP_COMMAND_PCI_CONFIG,
>                                save | RADEON_AGP_ENABLE);
>         pci_read_config_dword(dev->pdev, RADEON_AGP_COMMAND_PCI_CONFIG, &temp);
>         if (temp & RADEON_AGP_ENABLE)
>                 dev_priv->flags |= CHIP_IS_AGP;
>         DRM_DEBUG("%s card detected\n",
>                   ((dev_priv->flags & CHIP_IS_AGP) ? "AGP" : "PCI"));
>         pci_write_config_dword(dev->pdev, RADEON_AGP_COMMAND_PCI_CONFIG, save);

perhaps the stuff from Mike Harris in the latest radeon_driver.c in
Xorg might be a better idea..

Dave.