fail to use kdump function

[Fred Kimmy]

[Bug Description]
if use offical way to config kdump function， it fail to be ok

[Steps to Reproduce]
1) root@caoll:~# apt install linux-crashdump
2）reboot
3) root@caoll:~# kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr: 0x5e000000
   /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-5.11.0-27-generic
kdump initrd:
   /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-5.11.0-27-generic
current state: ready to kdump

kexec command:
  /sbin/kexec -p --command-line="BOOT_IMAGE=/vmlinuz-5.11.0-27-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
root@caoll:~# dmesg | grep crashkernel
[ 0.000000] cannot allocate crashkernel (size:0x100000000)
[ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-5.11.0-27-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
root@caoll:~# echo c > /proc/sysrq-trigger

[Actual Results]
dump fail

[Expected Results]
dump ok

[Reproducibility]
100%

[Additional information]
(Firmware version, kernel version, affected hardware, etc. if required 2022032315434):

[Resolution]
fix grub.cfg file
vi /etc/default/grub.d/kdump-tools.cfg， crashkernel=512M-:512M
vi /boot/grub/grub.cfg， crashkernel=512M-:512M

[Ike Panhc (ikepanhc)]

We can not use one crashkernel setting to satisfy all arm64 platform. Instead of that, for developer function e.g. kdump that crashkernel shall be input manually by developer for his own environment.