Hi Geert,
On Sat, Apr 23, 2011 at 20:13, Thorsten Glaser <tg@xxxxxxxxx> wrote:
â Reserve ST RAM early
Yeah, that's a valid one,
My (and probably lkml's) main issue there is that it introduces yet
another custom
allocator. Can we avoid that?
Ideally it would not be an issue if we could properly flag ST-RAM only
as DMA memory. I've tried in the past but setting the max. DMA address
to the 0x00ffffff did have unintended side effects elsewhere in the m68k
mm code.
If there is a generic lowmem allocator, we might be able to use that
instead. It does not need to be available early on, but we need to be
able to reserve some lowmem early.
Another possible hack would be to allocate lowmem early on for each
compiled-in user and store that in a platform device struct for use by
the driver once it initializes. Is there such a thing like early
initcalls for this specific purpose (do a minimum early setup such as
allocate resources, silence IRQs and the like)?.
If all that is not an option (and for the sake of modules needing
ST-RAM), I don't see another way to do it. Some parts of the hardware
just need memory below 0x00ffffff.
Cheers,
Michael
Iâm Bccâing the Debian Kernel person I was talking to, so we may
get an agreement. Iâll revisit your gitweb later then, to see
which patches you actually schedule for Linus, and try to get
them into Debian.
As for-2.6.39 got rebased in the mean time, you have to compare
m68k-v2.6.38 with m68k-queue to see what's (not yet) upstream.
And to back up Christian: keep up the good work!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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