default or selected kernelversion does not have config value CONFIG_BLK_DEV_RZ1000.
Result is shown for kernelversion 6.9.9

RZ1000 chipset bugfix/support

modulename: rz1000.ko

configname: CONFIG_BLK_DEV_RZ1000

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>RZ1000 chipset bugfix/support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
The PC-Technologies RZ1000 IDE chip is used on many common 486 and
Pentium motherboards, usually along with the "Neptune" chipset.
Unfortunately, it has a rather nasty design flaw that can cause
severe data corruption under many conditions. Say Y here to include
code which automatically detects and corrects the problem under
Linux. This may slow disk throughput by a few percent, but at least
things will operate 100% reliably.

source code: