How to softmod Ati Radeon 9500 (R300)?

[TripleShiftOne]

On 13.05.2014 21:34 Connor Behan wrote:
> On 11/05/14 12:00 PM, TripleShiftOne wrote:
>> Hallo,
>> i want to override the DeviceID of an Ati Radeon 9500 (R300) to get one
>> more quadpipe (Softmod). For this the chip has to be forced to be
>> identified as 0x4e45 (instead of 0x4144).
>>
>> I added 'ChipID 0x4e45' into 'Section "Device"' that doesn't have any
>> effect. The 'Xorg.0.log' still shows 0x4144 ChipID.
>>
>> On MS-Windows i patch the driver on binary level by swapping the IDs
>> that works flawlessly. I also tried that on Linux 'radeon_drv.so' but it
>> doesn't have any effect. Performance is tested with 'glxgears' resulting
>> in ~2600fps always. It should raise significantly if working properly.
>>
>> Any idea how to do this?
> Whatever Catalyst feature you are enabling, it isn't in radeon_drv.so.
> Those two chipsets (R300_AD and R300_NE) are treated identically by the
> pcidb
> http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/tree/src/pcidb/ati_pciids.csv.
> Check the kernel and mesa drivers to see if they have any code that gets
> executed for one but not the other.
>

Maybe its no specific driver function (different runtime path) but the
VendorID string itself that gets passed back to the chip by the driver.

Do you know any place in the code where this could happen?