eMMC spec 4.5 has a tiny (2MiB or 4MiB) Replay Protected Memory Block. As well as UFS and NVMe have support for RPMB.
That RPMB area is protected from readwrite access. --- The kernel has been patched to not access this rpmb area: $ dmesg | grep rpmb [ 6.712468] mmcblk0rpmb: mmc0:0001 SEM04G partition 3 2.00 MiB --- Parted (GNU parted) 3.2 still tries to access the RPMB: Error: /dev/mmcblk0rpmb: unrecognised disk label Warning: Error fsyncing/closing /dev/mmcblk0rpmb: Input/output error Retry/Ignore? Resulting in dmesg logged errors like: [46684.715228] print_req_error: I/O error, dev mmcblk0rpmb, sector 0 --- Should (GNU) parted be patched too, or not? Cheers, Ceriel
