Hello Simon and Vivek, For s390 we currently use /proc/iomem for defining the memory layout in the kexec elfcore header. Unfortunately this is not correct, when using memory hotplug. When a memory chunk is set offline (e.g. with "echo offline > /sys/devices/system/memory/memoryX/state") this is not reflected in /proc/iomem. To fix this I could parse /sys/devices/system/memory and exclude each memory chunk that in not online from the /proc/iomem info. Do you think that this approach is fine or is there a better solution? Michael