Julius Werner has posted comments on this change. ( https://review.coreboot.org/19679 )
Change subject: util/cbmem: mmap underflow on low addresses
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Patch Set 3:
$ sudo ./cbmem -l
Failed to mmap /dev/mem: Operation not permitted
EPERM means you're violating STRICT_DEVMEM, that check happens before the crash. Either compile a kernel without STRICT_DEVMEM or try this on a machine where the relevant physical address range would not be normal memory.
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