linux-kernel - Re: [PATCH] arm, omap2, sram: On HS/EMU devices, only 64K internal SRAM is available.

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Message-ID: <20151014222022.GL10113@atomide.com>
Date:	Wed, 14 Oct 2015 15:20:23 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Heiko Schocher <hs@...x.de>
Cc:	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, Georg.Soffel@...ch-si.com,
	Ayoub Zaki <Ayoub.Zaki@...ch-si.com>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm, omap2, sram: On HS/EMU devices, only 64K internal
 SRAM is available.

* Tony Lindgren <tony@...mide.com> [151014 10:56]:
> * Heiko Schocher <hs@...x.de> [151012 22:58]:
> > Of this, secure content (including PPA) uses initial
> > portion of the SRAM. This chunk is not (and shouldn't
> > be) accessible from the public code.
> > 
> > The minimum size of this chunk (0x350) is used in this
> > patch. Available size is rounded off to 63K.
> > 
> > Both values would require a change if size of secure
> > content grows beyond 0x350.
> 
> Makes sense to me. And something similar is needed at least for
> dm814x to get rid of the imprecise abort during boot with
> commit bbeb92095159 ("ARM: 8422/1: enable imprecise aborts during
> early kernel startup") applied.
>
> Is this needed as a fix to the -rc cycle, or can this wait for
> v4.4?

Actually I think we may have a regression somwhere. If you look
at commit 8b9a2810b02e ("ARM: OMAP4+: Move SRAM data to DT")
this should all be handled by drivers/misc/sram.c nowadays.

So for most SoCs, we should completely skip the plat-omap/sram.c
code.

Regards,

Tony
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