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List: freedesktop-xorg
Subject: Re: Question about the MGA driver...
From: Egbert Eich <eich () suse ! de>
Date: 2006-03-31 18:55:24
Message-ID: 17453.31516.562365.323634 () hermes ! suse ! de
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Ian Romanick writes:
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> Does any one know why the MGA driver allows the config file to over-ride
> the base address for the BARs? There are separate options to over-ride
> the base address of the framebuffer, MMIO region, and the ILOAD region.
>
> Is there any case where this is actually necessary / a good idea?
A lot of drivers allowed to set the MemBase for non-PCI cards.
This was a generic option. In the mga driver it seems to be
possible to use this to switch the basis to the base address
of another BAR. This seems to be odd - however if you look further
you will find that the driver contains code to set the base<>BAR
mapping depending on chipsets/revision.
It's possilbe that people thought that not all existing chipset/revision
combos that required special treatment were supported and wanted to
make this configurable.
Cheers,
Egbert.
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