From: Ryan Mallon <rmallon@gmail.com>
To: Marcus Folkesson <marcus.folkesson@gmail.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: ioremap on system memory
Date: Fri, 11 Nov 2011 09:11:51 +1100 [thread overview]
Message-ID: <4EBC4C27.3070400@gmail.com> (raw)
In-Reply-To: <CAM8FrKJ8OeavZxTBJBONw76UBBzS_mQYMZuS6Chf8+Po6yqDgA@mail.gmail.com>
On 10/11/11 19:06, Marcus Folkesson wrote:
> Hi,
>
> I'm working with a custom based platform based on OMAP-L138.
> A driver we are using is ioremapping system memory. It does this to
> share data between the GPP and DSP core.
> This is not allowed in later kernel versions since ARMv6+ does not support this.
>
> Is there any good(and easy) way to get around this or is it so
> fundamentally wrong that the driver should be written from scratch?
Cc'ed the ARM kernel list and Marek Szyprowski (CMA developer). The CMA
patches I think do what you want, but I am not sure if they are merged
yet. The other solution (again, I'm not an expert on this area) is to
not pass the region of memory you want to manage as part of Linux's
normal system memory. See how the OMAP framebuffer driver reserves a
region of SDRAM (arch/arm/plat-omap/fb.c).
Some one else on the ARM list can probably explain in more detail.
~Ryan
next prev parent reply other threads:[~2011-11-10 22:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-10 8:06 ioremap on system memory Marcus Folkesson
2011-11-10 22:11 ` Ryan Mallon [this message]
2011-11-11 6:59 ` Marcus Folkesson
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=4EBC4C27.3070400@gmail.com \
--to=rmallon@gmail.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=marcus.folkesson@gmail.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox