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

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20200406201053.GA10931@Red>
Date:   Mon, 6 Apr 2020 22:10:53 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
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 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.