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 Thanks