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

CONFIG_PPC_BESTCOMM_ATA (not configurable)

modulename: bestcomm-ata.ko

configname: CONFIG_PPC_BESTCOMM_ATA

Linux Kernel Configuration
└─>PPC_BESTCOMM_ATA
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
This option enables the support for the ATA task.

source code:

is depended by
CONFIG_PATA_MPC52xx