CONFIG_PPC_MAPLE is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Maple 970FX Evaluation Board

configname: CONFIG_PPC_MAPLE

Linux Kernel Configuration
└─>Maple 970FX Evaluation Board
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
This option enables support for the Maple 970FX Evaluation Board.
For more information, refer to <http://www.970eval.com>

selects
CONFIG_MPIC
CONFIG_U3_DART
CONFIG_MPIC_U3_HT_IRQS
CONFIG_GENERIC_TBSYNC
CONFIG_PPC_UDBG_16550
CONFIG_PPC_970_NAP
CONFIG_PPC_NATIVE
CONFIG_PPC_RTAS
CONFIG_MMIO_NVRAM
CONFIG_ATA_NONSTANDARD

depends
CONFIG_PPC64
CONFIG_PPC_MULTIPLATFORM