linux-kernel - Re: [PATCH 0/2] x86/quark: Add eSRAM driver and test code

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Date:	Wed, 6 May 2015 11:52:35 +0200
From:	Ingo Molnar <mingo2.kernel.org@...il.com>
To:	Bryan O'Donoghue <pure.logic@...us-software.ie>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, dvhart@...radead.org, andy.schevchenko@...il.com,
	boon.leong.ong@...el.com, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, derek.browne@...el.com,
	josef.ahmad@...el.com, erik.nyquist@...el.com
Subject: Re: [PATCH 0/2] x86/quark: Add eSRAM driver and test code


* Bryan O'Donoghue <pure.logic@...us-software.ie> wrote:

> Quark X1000 SoC contains a 512 KiB embedded SRAM (eSRAM) memory that can
> be mapped onto an area of DRAM in block or on per-page overlay mode where a
> 4 KiB aligned region can be overlayed - allowing for broken up mappings
> with a 4 KiB individual granularity.
> 
> eSRAM has access times similar to an L1 cache. The following patchset
> adds a gen_pool driver and automatic test routine to exercise eSRAM. The
> intent of the eSRAM driver is to allow other drivers to allocate SRAM
> buffers. In contrast to the original BSP code no attempt will be made to
> map kernel .data section code, this is a simple SRAM buffer allocation/free
> mechanism and a sanity test to ensure it's ongoing correctness.
> 
> Bryan O'Donoghue (2):
>   x86/quark: Add Quark embedded SRAM support
>   x86/quark: Add Quark embedded SRAM self-test

So I'm wondering what the primary usecase is for this. The eSRAM API 
is purely in-kernel, right? The only user seems to be the self-test. 
What other users will there be?

Thanks,

	Ingo
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