Messages in this thread | | | Subject | Re: PROBLEM: `modprobe agpgart` locks machine badly | From | Diego SANTA CRUZ <> | Date | 14 May 2002 10:11:23 +0200 |
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Hi Alex,
> 1. > `modprobe agpgart` locks machine badly
I experience the exact same problem on my machine (an HP Omnibook 4150 laptop): a hard-lock in the initalization of the agpgart module, with the same chipset (440BX/ZX).
> 7.500:00.0 Host bridge: Intel Corp. 440BX/ZX - 82443BX/ZX Host bridge > (rev 03) > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- > ParErr- Step > ping- SERR+ FastB2B- > Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- > <TAbort > - <MAbort+ >SERR- <PERR- > Latency: 64 > Region 0: Memory at <unassigned> (32-bit, prefetchable) > [size=256M] > Capabilities: [a0] AGP version 1.0 > Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2 > Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
I did a bit of debugging some time ago with the datasheets from intel. If i remember well, the problem was that the base of the aperture is not initialized by the BIOS (i.e. the APBASE register of the AGP bridge).
This is visible in the lspci listing above, in that the Region 0 memory is "<unassigned>". On the machines that I have seen with agpgart working, the address of Region 0 is the address that appears in the APBASE register.
I did not find any solution for my machine. Maybe there is a BIOS upgrade that solves the problem for you? If you find any solution please let me know.
Best regards,
Diego -- ------------------------------------------------------- Diego Santa Cruz PhD. student Publications available at http://ltswww.epfl.ch/~dsanta Signal Processing Institute (ITS) -- formerly LTS Swiss Federal Institute of Technology (EPFL) EPFL - STI - ITS, CH-1015 Lausanne, Switzerland E-mail: Diego.SantaCruz@epfl.ch Phone: +41 - 21 - 693 26 57 Fax: +41 - 21 - 693 76 00 -------------------------------------------------------
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