CONFIG_BF527_NAND_D_PORTF is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF527_NAND_D_PORTF.
Result is shown for kernelversion 6.7-rc3

PORT F

configname: CONFIG_BF527_NAND_D_PORTF

NAND (NFC) Data
└─>PORT F
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
PORT F