CONFIG_BOOTX_TEXT is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Support for early boot text console (BootX or OpenFirmware only)

modulename: btext.ko

configname: CONFIG_BOOTX_TEXT

Linux Kernel Configuration
└─>Support for early boot text console (BootX or OpenFirmware only)
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Say Y here to see progress messages from the boot firmware in text
mode. Requires either BootX or Open Firmware.

source code: