linux-kernel - Re: [PATCH] ARM: mach-qcom: fix support for ipq806x

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <63531543.050a0220.b6bf5.284d@mx.google.com>
Date:   Fri, 21 Oct 2022 23:55:07 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Russell King <linux@...linux.org.uk>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Nick Hawkins <nick.hawkins@....com>,
        John Crispin <john@...ozen.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] ARM: mach-qcom: fix support for ipq806x

On Fri, Oct 21, 2022 at 11:44:56PM +0200, Linus Walleij wrote:
> On Fri, Oct 21, 2022 at 8:10 PM Christian Marangi <ansuelsmth@...il.com> wrote:
> 
> > Add a specific config flag for Qcom IPQ806x as this SoC can't use
> > AUTO_ZRELADDR and require the PHYS_OFFSET set to 0x42000000.
> >
> > This is needed as some legacy board (or some wrongly configured
> > bootloader) pass the wrong memory map and doesn't exclude the first
> > ~20MB of RAM reserved for the hardware network accellerators.
> >
> > With this change we can correctly support each board and prevent any
> > kind of misconfiguration done by the OEM.
> >
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> 
> I had exactly this problem with the APQ8060 as well, then my problem
> went away. I was under the impression that this was solved.
> 
> Is it not possible to use Geert's linux,usable-memory-range in
> the chosen node to make the kernel stay off the memory?
> (See examples by grep usable-memory in the kernel.)
> 

Hi,
just to confirm this is one of the example you are suggesting?

chosen {
		bootargs = "console=ttyS0,115200 earlycon";
		stdout-path = "serial0:115200n8";
		linux,usable-memory-range = <0x80200000 0x1fe00000>;
	};

Main problem here is that uboot in some case doesn't support dt and pass
wrong ATAGS (with the memory not reserved) and AUTO_ZRELADDR calculate
the wrong addr I assume?

I will test the usable-memory-range but isn't the same of declaring
reserved space in the dts? Or the zimage decompressor checks
linux,usable-memory-range bypassing atags?

-- 
	Ansuel