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

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Date:   Sun, 14 May 2017 14:50:07 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Phil Elwell <phil@...pberrypi.org>,
        linux-rpi-kernel@...ts.infradead.org
Cc:     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,
        Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>
Subject: Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware

Am 09.05.2017 um 11:04 schrieb Phil Elwell:
> The Raspberry Pi startup stub files for multi-core BCM27XX processors

Curiously, while this V2 was rebased to apply against the bcm283x rather
than bcm2710 file, it changed the text from BCM283X to BCM27XX.

> 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>
> ---
> 
> Changes in V2:
> - Rebase against linux-next
> - Drop downstream-only patch
> 
>  arch/arm/boot/dts/bcm283x.dtsi | 2 ++
>  1 file changed, 2 insertions(+)

Regards,
Andreas

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