CONFIG_SPARC32 is not available for thedefaultarchitecture x86.
Result is shown for architecture sparc

CONFIG_SPARC32 (not configurable)

modulename: atomic32.ko

and/or

leon_pmc.ko

and/or

etrap_32.ko

and/or

hypersparc.ko

and/or

sun4m_irq.ko

and/or

sun4c.ko

and/or

loadmmu.ko

and/or

entry.ko

and/or

extable.ko

and/or

ioport.ko

and/or

systbls_32.ko

and/or

leon_mm.ko

and/or

devices.ko

and/or

nosun4c.ko

and/or

windows.ko

and/or

leon_kernel.ko

and/or

srmmu_access.ko

and/or

tadpole.ko

and/or

muldiv.ko

and/or

rtrap_32.ko

configname: CONFIG_SPARC32

Linux/SPARC Kernel Configuration
└─>General machine setup
└─>SPARC32
In linux kernel since version 2.6.12  
SPARC is a family of RISC microprocessors designed and marketed by
Sun Microsystems, incorporated. They are very widely found in Sun
workstations and clones. This port covers the original 32-bit SPARC;
it is old and stable and usually considered one of the "big three"
along with the Intel and Alpha ports. The UltraLinux project
maintains both the SPARC32 and SPARC64 ports; its web page is
available at <http://www.ultralinux.org/>.