default or selected kernelversion does not have config value CONFIG_BLK_DEV_IDE_TX4939.
Result is shown for kernelversion 6.9.9

TX4939 internal IDE support

modulename: tx4939ide.ko

configname: CONFIG_BLK_DEV_IDE_TX4939

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>TX4939 internal IDE support
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
source code:
drivers/ide/tx4939ide.c