linux-kernel - Re: Trying to kexec on Allwinner A80

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Message-ID: <20200406093729.GG25745@shell.armlinux.org.uk>
Date:   Mon, 6 Apr 2020 10:37:29 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     ebiederm@...ssion.com, kexec@...ts.infradead.org, wens@...e.org,
        linux-arm-kernel@...ts.infradead.org, mripard@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Trying to kexec on Allwinner A80

On Mon, Apr 06, 2020 at 11:25:40AM +0200, Corentin Labbe wrote:
> On Mon, Apr 06, 2020 at 10:16:00AM +0100, Russell King - ARM Linux admin wrote:
> > On Mon, Apr 06, 2020 at 10:27:20AM +0200, Corentin Labbe wrote:
> > > Hello
> > > 
> > > I am trying to add the last missing Allwinner Soc in kernelci: the A80.
> > > But this SoC does not have any way to be used in kernelci, no USB nor network in uboot.
> > > So I have tried to fake uboot since the kernel has network support and run the new kernel via kexec.
> > > 
> > > But kexec 2.0.18 fail to work:
> > > kexec --force /tmp/kernel --initrd /tmp/ramdisk --dtb /tmp/dtb --command-line='console=ttyS0,115200n8 root=/dev/ram0 earlycon=uart,mmio32,0x7000000 ip=dhcp'
> > 
> > What happens if you omit the dtb argument?
> > 
> 
> No change without dtb
> 
> I have also tried to add --mem-mim and --mem-max without any change.
> I given mem according to what I saw in /proc/iomem
> 20000000-9fffffff : System RAM
>   20008000-207fffff : Kernel code
>   20900000-209a0c87 : Kernel data
> So I gave --mem-min 0x30000000 --mem-max 0x9fffffff
> Anyway, the result is always the same.

The next step is to enable the early debugging - first in the
decompressor - add #define DEBUG to the top of
arch/arm/boot/compressed/head.S

Also enable DEBUG_LL in the kernel and use earlyprintk to see if you can
get anything from the new kernel.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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