CONFIG_44x is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

AMCC 44x

modulename: 44x_mmu.ko

and/or

misc_44x.ko

and/or

cpu_setup_44x.ko

and/or

idle.ko

configname: CONFIG_44x

Processor Type
└─>AMCC 44x
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
/arch/powerpc/platforms/44x/