From: Corentin Labbe <clabbe.montjoie@gmail.com>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: ebiederm@xmission.com, kexec@lists.infradead.org, wens@csie.org,
linux-arm-kernel@lists.infradead.org, mripard@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: Trying to kexec on Allwinner A80
Date: Tue, 7 Apr 2020 10:01:44 +0200 [thread overview]
Message-ID: <20200407080144.GA20773@Red> (raw)
In-Reply-To: <20200407073117.GH25745@shell.armlinux.org.uk>
On Tue, Apr 07, 2020 at 08:31:17AM +0100, Russell King - ARM Linux admin wrote:
> On Mon, Apr 06, 2020 at 10:10:53PM +0200, Corentin Labbe wrote:
> > On Mon, Apr 06, 2020 at 10:37:29AM +0100, Russell King - ARM Linux admin wrote:
> > > 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.
> > >
> >
> > I dont know what happened, but now I always get "Could not find a free area of memory of 0x86c1c0 bytes..." (even with kexec 2.0.18)
> > Furthermore, I have added crashkernel=128M to the cmdlist
> > I have verified that the reservation is working:
> > 20000000-9fffffff : System RAM
> > 20008000-207fffff : Kernel code
> > 20900000-209a0c87 : Kernel data
> > 40000000-47ffffff : Crash kernel
> > But even with this reservation, no change.
>
> crashkernel is only necessary if you're loading a kenrel image to be
> booted when the existing one has crashed. For the problem you're
> seeing, it's an unnecessary additional change; please drop that.
>
> You could try running kexec with debug enabled to see more information.
>
I am already running with --debug
next prev parent reply other threads:[~2020-04-07 8:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-06 8:27 Trying to kexec on Allwinner A80 Corentin Labbe
2020-04-06 9:16 ` Russell King - ARM Linux admin
2020-04-06 9:25 ` Corentin Labbe
2020-04-06 9:37 ` Russell King - ARM Linux admin
2020-04-06 20:10 ` Corentin Labbe
2020-04-07 7:31 ` Russell King - ARM Linux admin
2020-04-07 8:01 ` Corentin Labbe [this message]
2020-04-07 8:12 ` Russell King - ARM Linux admin
2020-04-07 9:32 ` Corentin Labbe
2020-04-07 10:01 ` Russell King - ARM Linux admin
2020-04-07 10:02 ` Russell King - ARM Linux admin
2020-04-07 10:19 ` Russell King - ARM Linux admin
2020-04-07 11:34 ` Corentin Labbe
2020-04-07 12:22 ` Russell King - ARM Linux admin
2020-04-07 13:05 ` Corentin Labbe
2020-04-07 13:26 ` Russell King - ARM Linux admin
2020-04-07 13:48 ` Corentin Labbe
2020-04-07 18:17 ` Russell King - ARM Linux admin
2020-04-08 8:40 ` Corentin Labbe
2020-04-08 9:33 ` Russell King - ARM Linux admin
2020-04-08 15:24 ` Corentin Labbe
2020-04-08 16:16 ` Russell King - ARM Linux admin
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