About command line for kdump on ARM64

[Bhupesh SHARMA]

Hello Yang Shunyong,

On Fri, Nov 10, 2017 at 3:52 PM, Yang Shunyong <yang.shunyong at gmail.com> wrote:
> Hi, All,
>     I am trying to enable kdump on ARM64, based on 4.14 kernel.  I met
> EFI reserved memory(eg. ACPI tables) being released issue, in function
> arm64_memblock_init() . It will cause the memory attribute incorrect
> and kernel crash in ACPI parsing.
>     From the discussions about kdump on ARM64 I searched via Google,
> it needs to set some memory configurations, like "mem=". I have set
> the "mem=64M", but it still failed.
>     Could you please share me some sample command line settings for
> kdump ARM64? Or how to set options to avoid  the crash?
>
> following is my command line from "kdump-config show", I have reserved
> 256M for crash in first kernel "crashkernel=256M at 0x0efe00000",
>
>   /sbin/kexec -p --command-line="BOOT_IMAGE=/vmlinuz-4.14.0-rc2-hxtysy
> root=/dev/mapper/ubuntu--vg-root ro rqpoll mem=256M nr_cpus=1 nousb
> systemd.unit=kdump-tools.service ns_log_on=on"
> --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
>

Yes, I am aware of this issue and debugging the same (see
https://bugzilla.redhat.com/show_bug.cgi?id=1505314 for details).

I plan to post a patch fixing this issue early next week.
I will keep you posted and also share an early version of the patch
with you so that you can check if the same works for you.

Regards,
Bhupesh