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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=tnxzmwc9gun.fsf@arm.com \
--to=catalin.marinas@gmail.com \
--cc=bvermeul@blackstar.xs4all.nl \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.