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

From	Eric Anholt <eric@anholt.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware
Date	2017-05-09 19:00 +0200
Message-ID	<tFgEp-4pa-7@gated-at.bofh.it> (permalink)
References	<tF9jz-89r-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

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!

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware Phil Elwell <phil@raspberrypi.org> - 2017-05-09 11:10 +0200
  Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware Florian Fainelli <f.fainelli@gmail.com> - 2017-05-09 18:30 +0200
  Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware Florian Fainelli <f.fainelli@gmail.com> - 2017-05-09 19:00 +0200
    Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware Eric Anholt <eric@anholt.net> - 2017-05-09 20:20 +0200
  Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware Eric Anholt <eric@anholt.net> - 2017-05-09 19:00 +0200

csiph-web