Comment 6 for bug 1663400

$ sudo cat /proc/iomem | grep "System RAM"
00d00000-fffecfff : System RAM
100000000-1ff369bfff : System RAM
1ff36b6000-1ff36b9fff : System RAM
1ff36bb000-1ff36c5fff : System RAM
1ff36d7000-1ffa7b8fff : System RAM
1ffac31000-1ffac47fff : System RAM
1ffac49000-1ffc404fff : System RAM
1ffc406000-1ffc588fff : System RAM
1ffcfc2000-1ffeac1fff : System RAM
1ffeae0000-1ffeafcfff : System RAM
1ffebb2000-1fff0fffff : System RAM

$ sudo kexec -d -l /boot/vmlinuz-4.10.0-20-generic --reuse-cmd --initrd=/boot/initrd.img-4.10.0-20-generic | grep "System RAM"
arch_process_options:141: command_line: root=UUID=872f9ad6-19e8-48d7-b109-0024974284b6 ro iommu.passthrough=1
arch_process_options:143: initrd: /boot/initrd.img-4.10.0-20-generic
arch_process_options:144: dtb: (null)
Try gzip decompression.
kernel: 0xffffabc0d010 kernel_size: 0x12ab200
get_memory_ranges_iomem_cb: 0000000000d00000 - 00000000fffecfff : System RAM
get_memory_ranges_iomem_cb: 0000000100000000 - 0000001ff369bfff : System RAM
get_memory_ranges_iomem_cb: 0000001ff36b6000 - 0000001ff36b9fff : System RAM
get_memory_ranges_iomem_cb: 0000001ff36bb000 - 0000001ff36c5fff : System RAM
get_memory_ranges_iomem_cb: 0000001ff36d7000 - 0000001ffa7b8fff : System RAM
get_memory_ranges_iomem_cb: 0000001ffac31000 - 0000001ffac47fff : System RAM
get_memory_ranges_iomem_cb: 0000001ffac49000 - 0000001ffc404fff : System RAM
get_memory_ranges_iomem_cb: 0000001ffc406000 - 0000001ffc588fff : System RAM
get_memory_ranges_iomem_cb: 0000001ffcfc2000 - 0000001ffeac1fff : System RAM
get_memory_ranges_iomem_cb: 0000001ffeae0000 - 0000001ffeafcfff : System RAM
get_memory_ranges_iomem_cb: 0000001ffebb2000 - 0000001fff0fffff : System RAM