CONFIG_REALVIEW_PB1176_SECURE_FLASH is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_REALVIEW_PB1176_SECURE_FLASH.
Result is shown for kernelversion 6.5.1

Allow access to the secure flash memory block

configname: CONFIG_REALVIEW_PB1176_SECURE_FLASH

Linux Kernel Configuration
└─>RealView platform type
└─>Allow access to the secure flash memory block
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Select this option if Linux will only run in secure mode on the
RealView PB1176 platform and access to the secure flash memory
block (64MB @ 0x3c000000) is required.