Timothy S. Nelson wrote: > Quick question. > > On Wed, 10 Dec 2008, Timothy S. Nelson wrote: > > 01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX > > 440] (rev a3) (prog-if 00 > > [VGA controller]) > > Subsystem: Micro-Star International Co., Ltd. Device 8470 > > Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- > > ParErr- Stepping- SERR- FastB2B- DisINTx- > > Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > > <TAbort- <MAbort- >SERR- <PERR- INTx- > > Interrupt: pin A routed to IRQ 10 > > Region 0: Memory at f0000000 (32-bit, non-prefetchable) [disabled] > > [size=16M] > > Region 1: Memory at e0000000 (32-bit, prefetchable) [disabled] > > [size=128M] > > Region 2: Memory at e8000000 (32-bit, prefetchable) [disabled] > > [size=512K] > > [virtual] Expansion ROM at e8080000 [disabled] [size=128K] > > Under what conditions should the [disabled] in the line above > disappear? If I echo 1 to /sys/bus/pci/devices/0000:01:00.0/rom should the > [disabled] part go away? Because it doesn't. > > However, it's having some effect. > > [root@rhys ~]# echo 1 > /sys/bus/pci/devices/0000:01:00.0/rom > [root@rhys ~]# cat /sys/bus/pci/devices/0000:01:00.0/rom > [root@rhys ~]# echo 0 > /sys/bus/pci/devices/0000:01:00.0/rom > [root@rhys ~]# cat /sys/bus/pci/devices/0000:01:00.0/rom > cat: /sys/bus/pci/devices/0000:01:00.0/rom: Invalid argument > > I would've expected more, though, from the first "cat". I'm not sure if it matches for the ROM, but the PCI address ranges (BARs) can only be mmapped, not read. Eike
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