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Date:   Fri, 10 Nov 2017 07:36:20 -0800
From:   Tony Lindgren <tony@atomide.com>
To:     Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc:     Pavel Machek <pavel@ucw.cz>, pali.rohar@gmail.com, sre@kernel.org,
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        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Andrew Morton <akpm@linux-foundation.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Russell King <linux@armlinux.org.uk>
Subject: Re: n900 in next-20170901
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* Joonsoo Kim <iamjoonsoo.kim@lge.com> [171110 06:34]:
> On Thu, Nov 09, 2017 at 07:26:10PM -0800, Tony Lindgren wrote:
> > +#define OMAP34XX_SRAM_PHYS	0x40200000
> > +#define OMAP34XX_SRAM_VIRT	0xd0010000
> > +#define OMAP34XX_SRAM_SIZE	0x10000
> 
> For my testing environment, vmalloc address space is started at
> roughly 0xe0000000 so 0xd0010000 would not be valid.

Well we can map it anywhere we want, got any preferences?

Just that the current save_secure_ram_context uses "high_mask"
of 0xffff to translate the address. To make this more flexible,
we need the save_secure_ram_context changes too. So we might
want to do the static mapping and save_secure_ram_context changes
as a single patch.

> And, PHYS can be different according to the system type. Maybe either
> OMAP3_SRAM_PUB_PA or OMAP3_SRAM_PA. It seems that SIZE and TYPE should
> be considered, too. My understanding is correct?

We can have a static map for the whole SRAM area, see function
__arm_ioremap_pfn_caller() for the comment "Try to reuse one of the
static mapping whenever possible". So the different public SRAM start
addresses and sizes don't matter there.

Regards,

Tony

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