default or selected kernelversion does not have config value CONFIG_BLK_DEV_IDE_PMAC.
Result is shown for kernelversion 6.9.9

PowerMac on-board IDE support

modulename: pmac.ko

configname: CONFIG_BLK_DEV_IDE_PMAC

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>PowerMac on-board IDE support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This driver provides support for the on-board IDE controller on
most of the recent Apple Power Macintoshes and PowerBooks.
If unsure, say Y.

source code: