default or selected kernelversion does not have config value CONFIG_BLK_DEV_SLC90E66.
Result is shown for kernelversion 6.9.9

SLC90E66 chipset support

modulename: slc90e66.ko

configname: CONFIG_BLK_DEV_SLC90E66

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>SLC90E66 chipset support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This driver ensures (U)DMA support for Victory66 SouthBridges for
SMsC with Intel NorthBridges. This is an Ultra66 based chipset.
The nice thing about it is that you can mix Ultra/DMA/PIO devices
and it will handle timing cycles. Since this is an improved
look-a-like to the PIIX4 it should be a nice addition.

Please read the comments at the top of
<file:drivers/ide/slc90e66.c>.

source code: