CONFIG_ARCH_MULTIPLATFORM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Allow multiple platforms to be selected
configname: CONFIG_ARCH_MULTIPLATFORM
ARM system type
└─>Allow multiple platforms to be selected
In linux kernel since version 3.1 (release Date: 2011-10-24)
selects
CONFIG_ARM_PATCH_PHYS_VIRTCONFIG_AUTO_ZRELADDR
CONFIG_COMMON_CLK
CONFIG_MULTI_IRQ_HANDLER
CONFIG_SPARSE_IRQ
CONFIG_USE_OF