CONFIG_MACH_BAST_IDE is not available for the selected architecture x86.
Result is shown for architecture arm

CONFIG_MACH_BAST_IDE (not configurable)

modulename: bast-ide.ko

configname: CONFIG_MACH_BAST_IDE

Linux Kernel Configuration
└─>MACH_BAST_IDE
In linux kernel since version 2.6.27 (release Date: 2008-10-09)
Internal node for machines with an BAST style IDE
interface
source code:
arch/arm/mach-s3c2410/bast-ide.c

depends
 or CONFIG_ARCH_S3C24XX |
| CONFIG_CPU_S3C2410