linux-kernel - Re: [PATCH] ARM: boot: Fix ATAGs with appended DTB

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Date:   Thu, 12 Mar 2020 13:23:09 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Nicolas Pitre <nico@...xnic.net>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Miao <eric.miao@...dia.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Chris Brandt <chris.brandt@...esas.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: boot: Fix ATAGs with appended DTB

Hi,

On 26.02.2020 21:48, Geert Uytterhoeven wrote:
> Hi Russell,
>
> On Wed, Feb 26, 2020 at 6:57 PM Russell King - ARM Linux admin
> <linux@...linux.org.uk> wrote:
>> On Wed, Feb 26, 2020 at 06:56:06PM +0100, Geert Uytterhoeven wrote:
>>> On Wed, Feb 26, 2020 at 6:49 PM Russell King - ARM Linux admin
>>> <linux@...linux.org.uk> wrote:
>>>> On Wed, Feb 26, 2020 at 07:35:14AM +0100, Marek Szyprowski wrote:
>>>>> On 25.02.2020 15:47, Geert Uytterhoeven wrote:
>>>>>> At early boot, register r8 may contain an ATAGs or DTB pointer.
>>>>>> When an appended DTB is found, its address is stored in r8, for
>>>>>> extraction of the RAM base address later.
>>>>>>
>>>>>> However, if r8 contained an ATAGs pointer before, that pointer will be
>>>>>> lost, and the provided ATAGs is no longer folded into the provided DTB.
>>>>>>
>>>>>> Fix this by leaving r8 untouched.
>>>>>>
>>>>>> Fixes: 137e522593918be2 ("ARM: 8960/1: boot: Obtain start of physical memory from DTB")
>>>>>> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
>>>>>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>>>> The original commit hasn't been submitted, so it can be fixed before it
>>>> hits mainline if you want.  Let me know what you want to do.  Thanks.
>>> Fixing the original is fine for me, of course.
>>> Thanks!
>> Please submit a replacement for 8960/1, thanks.
> Done.

Gentle ping. This fix is still not present in linux-next for over 2 weeks...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland