linux-kernel - Re: [PATCH 2/2] ARM: decompressor: add option to ignore MEM ATAGs

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Message-ID: <CACRpkdavA+OL-ek0JGBRFX=n_H4=j8DbB+nCr7=8htscAzrzFg@mail.gmail.com>
Date: Sat, 20 Jan 2024 12:51:06 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Russell King <linux@...linux.org.uk>, Arnd Bergmann <arnd@...db.de>, 
	Andrew Morton <akpm@...ux-foundation.org>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Jonathan Corbet <corbet@....net>, 
	Thomas Gleixner <tglx@...utronix.de>, Randy Dunlap <rdunlap@...radead.org>, 
	"Mike Rapoport (IBM)" <rppt@...nel.org>, Eric DeVolder <eric.devolder@...cle.com>, 
	Nathan Chancellor <nathan@...nel.org>, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
	Kees Cook <keescook@...omium.org>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...ainline.org>, John Crispin <john@...ozen.org>
Subject: Re: [PATCH 2/2] ARM: decompressor: add option to ignore MEM ATAGs

On Fri, Jan 19, 2024 at 9:14 PM Christian Marangi <ansuelsmth@...ilcom> wrote:

> Some bootloaders can pass broken MEM ATAGs that provide hardcoded
> information about mounted RAM size and physical location.
> Example booloader provide RAM of size 1.7Gb but actual mounted RAM
> size is 512Mb causing kernel panic.
>
> Add option CONFIG_ARM_ATAG_DTB_COMPAT_IGNORE_MEM to ignore these ATAG
> and not augument appended DTB memory node.
>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

So you cannot just ignore all the ATAGs I guess?
If it's the command line you need, you can pass an identical one in
chosen.

But if you really need this, it should be there.
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij