Comment 0 for bug 1786878

[Impact]
With artful, crashdump worked on the Cavium CRBs, Cavium-based Gigabyte boards and the Qualcomm Amberwing board, but it no longer works with v4.15. While possibly not a regression, crashdump also does not currently work with the HiSilicon D05 board, but does with the proposed fixes.

[Test Case]
sudo apt install linux-crashdump
sudo reboot (needed to add crashkernel= param)
echo 1 | sudo tee /proc/sys/kernel/sysrq
echo c | sudo tee /proc/sysrq-trigger

[Fix]
Fixes are currently staged in linux-next:
09ffcb0d718a0 arm64: acpi: fix alignment fault in accessing ACPI
20d12cf990618 efi/arm: map UEFI memory map even w/o runtime services enabled
3ea86495aef2f efi/arm: preserve early mapping of UEFI memory map longer for BGRT
5bcd44083a082 drivers: acpi: add dependency of EFI for arm64
50d7ba36b916d arm64: export memblock_reserve()d regions via /proc/iomem

[Regression Risk]
TBD