[Linux-fbdev-devel] Re: Updates to matroxfb: do you want DFP or TVOut on G450/G

[Petr V. <VAN...@vc...>]

On  8 Jun 02 at 2:57, Dave Jones wrote:
> On Sat, Jun 08, 2002 at 02:45:39AM +0200, Petr Vandrovec wrote:
>  > (4) You can read PINS through /proc.
>  > (H) Change /proc code to use driverfs instead. Linus refused
>  >     /proc based code already.
> 
> One of the first things I ever wrote for Linux was a PINS decoder.
> It read from /dev/mem to get the PINS structure. Any reason
> why this isn't good enough, and we need the kernel exporting PINS ?

It does not print decoded structure, it shows it in raw format, 64-128
bytes, just to avoid userspace parsing /dev/mem because of matroxfb 
did it already (and matroxfb needs PINS to properly initialize Gx50 
cards in non-PC hardware). And it may be non-trivial to get PINS from
userspace at all because of BIOSes may be disabled by firmware 
(and f.e. on my PC they are disabled for secondary adapters, so 
simple parsing /dev/mem leads to nowhere because of BIOS is hidden).

Besides that, it lives in complete separate file, so it is easy
to add/remove it.
                                    Best regards,
                                        Petr Vandrovec
                                        van...@vc...