linux-kernel - Re: PXA3xx internal SRAM

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Message-ID: <20100322075739.GI30801@buzzloop.caiaq.de>
Date:	Mon, 22 Mar 2010 08:57:39 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
Cc:	Eric Miao <eric.y.miao@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: PXA3xx internal SRAM

On Sun, Mar 21, 2010 at 08:47:22PM -0400, Haojian Zhuang wrote:
> On Sun, Mar 21, 2010 at 8:47 AM, Daniel Mack <daniel@...aq.de> wrote:
> > The pxa3xx series features a comparatively big and fast internal SRAM of
> > 256KB which is currently unused by the Linux kernel except for a 4-byte
> > return vector from suspend.
> >
> > I wonder what this could be used for. Is there any kind of cache that
> > would be worth putting there to speed up things for example?
> > And could the uncompressor probably benfit from that?
> >
> > Daniel
> 
> The size of internal SRAM isn't always 256KB. It could be 128KB, 256KB
> or 702KB. In marvell BSP, there's a memory management driver (aka IMM)
> to handle internal SRAM. So driver or user application could make use
> of it. And one part of internal SRAM is reserved for low power idle
> mode. But both of these two features aren't pushed into community yet.

Ok. I was more thinking about any kernel specific kind of cache that has
a fix size of 128kb or 256kb and which is consulted regularily. But I
don't know which kind of cache that could be.

As that's not neccessarily ARM-related, I copied LKML. Maybe anyone has
an idea.

Thanks,
Daniel

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