default or selected kernelversion does not have config value CONFIG_BLK_DEV_IDE_AU1XXX.
Result is shown for kernelversion 6.9.9

IDE for AMD Alchemy Au1200

modulename: au1xxx-ide.ko

configname: CONFIG_BLK_DEV_IDE_AU1XXX

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>IDE for AMD Alchemy Au1200
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/ide/au1xxx-ide.c