kernel/arch/powerpc/include/asm/crashdump-ppc64.h, branch linux-6.2.y Hosts the 0x221E linux distro kernel. https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-6.2.y 2020-07-29T13:47:54Z powerpc/kexec_file: Setup backup region for kdump kernel 2020-07-29T13:47:54Z Hari Bathini hbathini@linux.ibm.com 2020-07-29T11:42:58Z urn:sha1:1a1cf93c200581c72a3cd521e1e0a1a3b5d0077d Though kdump kernel boots from loaded address, the first 64KB of it is copied down to real 0. So, setup a backup region and let purgatory copy the first 64KB of crashed kernel into this backup region before booting into kdump kernel. Update reserve map with backup region and crashed kernel's memory to avoid kdump kernel from accidentially using that memory. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602294718.575379.16216507537038008623.stgit@hbathini