linux-kernel - Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware

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Message-ID: <8737cenfhc.fsf@eliezer.anholt.net>
Date:   Tue, 09 May 2017 09:48:31 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Phil Elwell <phil@...pberrypi.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware

Phil Elwell <phil@...pberrypi.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@...pberrypi.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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