[U-Boot] [PATCH v2 2/2] arm: Set TTB XN bit in case DCACHE_OFF for LPAE mode

Tom Rini
2016-10-29T17:41:45Z

On Sat, Oct 29, 2016 at 03:19:10PM +0530, Keerthy wrote:

> While we setup the mmu initially we mark set_section_dcache with
> DCACHE_OFF flag. In case of non-LPAE mode the DCACHE_OFF macro
> is rightly defined with TTB_SECT_XN_MASK set so as to mark all the
> 4GB XN. In case of LPAE mode XN(Execute-never) bit is not set with
> DCACHE_OFF. Hence XN bit is not set by default for DCACHE_OFF which
> keeps all the regions execute okay and this leads to random speculative
> fetches in random memory regions which was eventually caught by kernel
> omap-l3-noc driver.
>
> Fix this to mark the regions as XN by default.
>
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> Reviewed-by: Alexander Graf <agraf@suse.de>

Reviewed-by: Tom Rini <trini@konsulko.com>

--
Tom
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