linux-kernel - Re: [PATCH 0/2] ARM: decompressor: support AUTO

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Message-ID: <65abfe88.7b0a0220.6a394.c3b2@mx.google.com>
Date: Sat, 20 Jan 2024 18:10:29 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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>,
	Linus Walleij <linus.walleij@...aro.org>,
	John Crispin <john@...ozen.org>
Subject: Re: [PATCH 0/2] ARM: decompressor: support AUTO_ZRELADDR and
 appended DTB

On Sat, Jan 20, 2024 at 12:19:33PM +0100, Geert Uytterhoeven wrote:
> Hi Christian,
> 
> On Fri, Jan 19, 2024 at 9:14 PM Christian Marangi <ansuelsmth@...il.com> wrote:
> > With this applied and ARM_ATAG_DTB_COMPAT_IGNORE_MEM enabled (more
> > info in the related patch) ipq806x can boot right away with AUTO_ZRELADDR
> > enabled and a correct memory node defined in DTS.
> >
> > It's needed to ignore MEM ATAGs as most of the time the values from the
> > bootloader are hardcoded and OEM didn't care to actually provide them
> > resulting in funny situation where a Netgear R7800 with 512Mb of RAM
> > have Uboot passing 1.7GB of RAM with ATAGS.
> 
> I guess you still need other values from ATAGS, so building a kernel
> without CONFIG_ARM_ATAG_DTB_COMPAT is not an option?
>

As I said in the other patch, yes DTB_COMPAT is still needed for
bootargs passed from the bootloader via ATAGs. Sorry for not making this
detail more clear in the cover letter.

-- 
	Ansuel