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fast-reboot: verify firmware "romem" checksum
This takes a checksum of skiboot memory after boot that should be unchanged during OS operation, and verifies it before allowing a fast reboot. This is not read-only memory from skiboot's point of view, beause it includes things like the opal branch table that gets populated during boot. This helps to improve the integrity of firmware against host and runtime firmware memory scribble bugs. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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