Re: Add a "enable" sysfs attribute to the pci devices to allowuserspace (Xorg) to enable devices without doing foul direct access

[Peter Jones]

On Thu, 2006-05-04 at 17:38 -0400, Jon Smirl wrote:

> # cd /sys/bus/pci/devices/0000:01:00.0
> # echo 1 >rom
> # hexdump -C rom
> 
> As far as I know this works on every platform, not just the PC one.

Yep, you're right, this works.  So we don't necessarily need it for the
vbetool case.  X still could use it though, instead of their scary
poke-at-memory way.

> Don't mess around with the hardware trying to get to the ROM. Use the
> API provided by the kernel. Messing with the hardware will get it into
> a state that the kernel doesn't know about and can ultimately crash
> your system.

Exactly who do you see here messing with the hardware directly instead
of using kernel APIs?

-- 
  Peter

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/