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From: Eric Anholt <eric@anholt.net>
To: Phil Elwell <phil@raspberrypi.org>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
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Subject: Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware
In-Reply-To: <b6aef857-1454-7931-2c60-6d7b55b7a0a8@raspberrypi.org>
References: <b6aef857-1454-7931-2c60-6d7b55b7a0a8@raspberrypi.org>
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Date: Tue, 09 May 2017 09:48:31 -0700
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Phil Elwell <phil@raspberrypi.org> writes:

> The Raspberry Pi startup stub files for multi-core BCM27XX processors
> make the secondary CPUs spin until the corresponding mailbox is
> written. These stubs are loaded at physical address 0x00000xxx (as seen
> by the ARMs), but this page will be reused by the kernel unless it is
> explicitly reserved, causing the waiting cores to execute random code.
>
> Use the /memreserve/ Device Tree directive to mark the first page as
> off-limits to the kernel.
>
> See: https://github.com/raspberrypi/linux/issues/1989
>
> Signed-off-by: Phil Elwell <phil@raspberrypi.org>

This looks great.  We're currently in the merge window, so I can't
generate a new bcm2835-dt-next yet, but I'll pick this patch up when I
do.

Thanks for submitting upstream!

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