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_HAS_SG_CHAINCONFIG_ARM_PATCH_PHYS_VIRT
CONFIG_AUTO_ZRELADDR
CONFIG_TIMER_OF
CONFIG_COMMON_CLK
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_GENERIC_IRQ_MULTI_HANDLER
CONFIG_MIGHT_HAVE_PCI
CONFIG_PCI_DOMAINS
CONFIG_SPARSE_IRQ
CONFIG_USE_OF