From: Catalin Marinas <catalin.marinas@gmail.com>
To: Bas Vermeulen <bvermeul@blackstar.xs4all.nl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: NOMMU - How to reserve 1 MB in top of memory in a clean way
Date: Wed, 06 Apr 2005 14:26:08 +0100 [thread overview]
Message-ID: <tnxzmwc9gun.fsf@arm.com> (raw)
In-Reply-To: <1112781027.2687.6.camel@laptop.blackstar.nl> (Bas Vermeulen's message of "Wed, 06 Apr 2005 11:50:28 +0200")
Bas Vermeulen <bvermeul@blackstar.xs4all.nl> wrote:
> I am currently working on the bfinnommu linux port for the BlackFin 533.
> I need to grab the top 1 MB of memory so I can give it out to drivers
> that need non-cached memory for DMA operations.
I did this long time ago (on a 2.4 kernel), trying to avoid a hardware
problem. I re-ordered the zones so that ZONE_DMA came after
ZONE_NORMAL. Since the DMA memory was quite small (less than 1MB), I
also put a "break" before "case ZONE_DMA" in the
build_zonelists_node() functions to avoid the allocation fallback.
--
Catalin
next prev parent reply other threads:[~2005-04-06 13:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-06 9:50 NOMMU - How to reserve 1 MB in top of memory in a clean way Bas Vermeulen
2005-04-06 13:26 ` Catalin Marinas [this message]
2005-04-06 14:53 ` Richard B. Johnson
2005-04-06 15:05 ` Catalin Marinas
2005-04-06 15:13 ` Bas Vermeulen
2005-04-06 15:16 ` Bas Vermeulen
2005-04-06 15:56 ` Catalin Marinas
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