Re: Regarding your presentation "CFP, #LinuxCon, Beijing, June 19-20, 2017"

[Bruce Mitchell <bruce.mitchell@linux.vnet.ibm.com>]

On 4/1/2021 12:04, Bruce Mitchell wrote:
> Hello David, Pratyush, Vivek, and Maneesh,
> 
> This did not seem to send properly from IBM Notes; trying an alternative 
> plain text style.
> 
> And I am also referencing:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kdump/kdump.rst 
> 
> 
> I am Senior System Software / Firmware / Embedded Engineer do Linux 
> Kernel Developer for OpenBMC Firmware at @IBM, @ibm-openbmc, and @openbmc.
> 
> I am having troubles getting kdump functioning (fully implemented) on 
> our SoC is the ASPEED AST2600 which is an ARM Cortex A7 core.
> I need a crash dump on a kernel panic.  I need to get kdump working on 
> this platform.
> Our system has 512MB of RAM  and somewhere between 8GB and 32GB of eMMC 
> for mass storage; kernel panic mounts haven't always gone right,
> but that seem build dependent.
> 
> My Ubuntu 18.04 LTS Server it just worked first time, no issues.
> 
> My kernel is:
>      Bruce.Mitchell@fstone05p1:~/tmp/openbmc/build/rainier/tmp/work-shared/rainier/kernel-source$ git log | head
>      commit a3e4860badca60a766b53d169c1c9822cd65b344
>      Author: Zev Weiss <zev@bewilderbeest.net>
>      Date:   Mon Mar 29 19:23:38 2021 -0500
> 
> I have kexec -l functioning about like I would expect.
> I can get kexec -p to boot the "crash" kernel (my primary kernel and my 
> crash kernel are the same).
> 
> My kexec command line; I have tried with out 
> --initrd=/home/kexec_files/initrd as well.
>      kexec -d -p /home/kexec_files/kernel.zImage \
>                --initrd=/home/kexec_files/initrd \
>                --dtb=/home/kexec_files/dtb \
>                --append="earlycon crashkernel=24M console=ttyS4,115200n8 
> rootwait root=PARTLABEL=rofs-a 1 reset_devices"
> 
> I have no core files in /proc
>      sh-5.1# ls -l /proc/ | grep core
>      sh-5.1#
> So what or where should I copy from for kdump?
> 
> OpenBMC builds on OpenEmbedded and Yocto all part of The Linux 
> Foundation Projects.
> 
> I feel like I am just missing some simple clue or two.
> 
> 
> Any suggestions, pointers, critique would be highly appreciated!
> 
> Thank you!
> 
> -- 
> Bruce Mitchell


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