This module provides support for commands read_byte,
read_word, read_dword, write_byte,
write_word, and write_dword to read /
write data to physical memory (addresses). The "read" commands accept one
parameter to specify the source address. The "write" commands require either two
or three parameters, with the order: address, value, <optional mask>.
Note: The commands provided by this module are not allowed when lockdown is
enforced (see Lockdown when booting on a secure setup).