udelay based port-IO delay
configname: CONFIG_IO_DELAY_UDELAY
IO delay type
└─>udelay based port-IO delay
In linux kernel since version 2.6.25 (release Date: 2008-04-16)
Use udelay(2) as the IO delay method. This provides the delay
while not having any side-effect on the IO port space.
while not having any side-effect on the IO port space.