CONFIG_NO_IOMEM is not available for the selected architecture x86.
Result is shown for architecture um

disable IOMEM

configname: CONFIG_NO_IOMEM

Linux Kernel Configuration
└─>UML-specific options
└─>disable IOMEM
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
depends
NOT CONFIG_INDIRECT_IOMEM