[RFC PATCH] Consolidate SRAM support

Grant Likely grant.likely at secretlab.ca
Fri Apr 15 11:32:01 EDT 2011

On Fri, Apr 15, 2011 at 9:26 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Fri, Apr 15, 2011 at 04:40:00PM +0200, Arnd Bergmann wrote:
>> On Friday 15 April 2011 15:39:55 Rob Herring wrote:
>> > On 04/15/2011 08:06 AM, Russell King - ARM Linux wrote:
>> > > This is work in progress.
>> > >
>> > > We have two SoCs using SRAM, both with their own allocation systems,
>> > > and both with their own ways of copying functions into the SRAM.
>> >
>> > It's more than that. Several i.MX chips use plat-mxc/iram_alloc.c.
>> There are also non-ARM systems doing something like that,
>> arch/blackfin/mm/sram-alloc.c comes to mind. On powerpc, the
>> ppc7410 also has this feature in hardware, but I believe it was
>> never supported in mainline Linux.
> Yes, but there's some horrible bits out there.  PPC is one of them
> which looks like it doesn't lend itself to consolidating with this
> kind of implementation.
>> How about putting sram-pool.c into the top-level mm/ directory
>> and sram-pool.h into include/linux? They seem to be completely
>> generic to me, aside from the dependency on asm/fncpy.h which
>> should probably remain arch specific.
> I've thought about lib - but first lets see whether other architectures
> want to use it first.  I've asked the sh folk off-list about this and
> waiting for a reply.
> Blackfin and PPC look horrible to sort out though, so they can come at
> a later date if they so wish.

Yes, once the infrastructure is in place, powerpc can do its own
migration to the new code.  I vote for putting it in lib at the


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