CONFIG_ARCH_IXP4XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
IXP4xx-based
configname: CONFIG_ARCH_IXP4XX
ARM system type
└─>IXP4xx-based
In linux kernel since version 2.6.12
Support for Intel's IXP4XX (XScale) family of processors.
selects
CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASKCONFIG_ARCH_SUPPORTS_BIG_ENDIAN
CONFIG_CPU_XSCALE
CONFIG_DMABOUNCE
CONFIG_GENERIC_IRQ_MULTI_HANDLER
CONFIG_GPIO_IXP4XX
CONFIG_GPIOLIB
CONFIG_HAVE_PCI
CONFIG_IXP4XX_IRQ
CONFIG_IXP4XX_TIMER
CONFIG_NEED_MACH_IO_H
CONFIG_USB_EHCI_BIG_ENDIAN_DESC
CONFIG_USB_EHCI_BIG_ENDIAN_MMIO