Mailinglist Archive: radeonhd (365 mails)

[Michael Cree <mcree@xxxxxxxxxxxx>]

Matthias Hopf wrote:
> On Mar 02, 09 15:51:38 +1300, Michael Cree wrote:
>   
> > On 2/03/2009, at 3:53 AM, Martijn Bastiaan wrote:
> >     
> > > Some users have reported they also need to do:
> > >        # setpci -s <pci_bus_id>  ROM_ADDRESS=xxxx0001
> > >        # setpci -s <pci_bus_id>  COMMAND=2
> > >
> > >        replace <pci_bus_id> with the PCI bus ID and xxxx with the hex
> > >        digits you can obtain thru  lspci -nv .
> > >
> > > Which 'hex digits' do they mean? My ouput for example:
> > >       
> > Gosh, that's interesting, I hadn't noticed that on the wiki.  I will find 
> > that advice helpful too.
> >
> > But to answer your question, the following line is relevant:
> >
> >     
> > >         [virtual] Expansion ROM at fdf00000 [disabled] [size=128K]
> > >       
> > That tells you that the ROM is at fdf00000 so I think you need to enter:
> >
> > setpci -s <pci_bus_id>  ROM_ADDRESS=fdf00001
> >
> > (Note that the address should have its lowest bit set in the setpci 
> > command. Looking at the include file /usr/include/linux/pci_regs.h suggests 
> > that the lowest bit is an enable bit.)
> >     
>
> Could you please enter that in the wiki? You apparently know what this
> is supposed to do ;-)
>   
No, I am no expert.  I just read the documentation!  'man setpci' lists 
the commands, and in typical Linux fashion is badly written, incomplete 
and gives you the complete run around, in this case by referencing 
/usr/include/linux/pci.h which includes <linux/pci_regs.h> which contains:

#define PCI_ROM_ADDRESS         0x30    /* Bits 31..11 are address, 
10..1 reserved */
#define  PCI_ROM_ADDRESS_ENABLE 0x01
#define PCI_ROM_ADDRESS_MASK    (~0x7ffUL)

which I surmise from the PCI_ROM_ADDRESS_ENABLE definition that the 
zeroeth bit is an enable bit.  A test on my computer reveals that 
setting and clearing this bit enables me to enable and disable the ROM 
of a PCI card as reported by lspci.

There is also documentation in the Linux kernel source 
(Documentation/filesystems/sysfs-pci.txt) which describes the enable and 
rom files entries in the sysfs directory for the PCI card.

Cheers
Michael.

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