default or selected kernelversion does not have config value CONFIG_BLK_DEV_CMD640_ENHANCED.
Result is shown for kernelversion 6.9.9
CMD640 enhanced support
configname: CONFIG_BLK_DEV_CMD640_ENHANCED
Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>CMD640 enhanced support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
This option includes support for setting/autotuning PIO modes and
prefetch on CMD640 IDE interfaces. For details, read
<file:Documentation/ide/ide.txt>. If you have a CMD640 IDE interface
and your BIOS does not already do this for you, then say Y here.
Otherwise say N.
prefetch on CMD640 IDE interfaces. For details, read
<file:Documentation/ide/ide.txt>. If you have a CMD640 IDE interface
and your BIOS does not already do this for you, then say Y here.
Otherwise say N.