CONFIG_DIRECT_IO_ACCESS is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
Allow user to access IO directly
configname: CONFIG_DIRECT_IO_ACCESS
Linux Kernel Configuration
└─>Allow user to access IO directly
In linux kernel since version 2.6.12
Disable the CPU internal registers protection in user mode,
to allow a user application to read/write them.
to allow a user application to read/write them.