CONFIG_AXON_RAM is not available for the default architecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_AXON_RAM.
Result is shown for kernelversion 6.0-rc6

Axon DDR2 memory device driver

modulename: axonram.ko
configname: CONFIG_AXON_RAM

Linux Kernel Configuration
└─> Platform support
└─> Axon DDR2 memory device driver

It registers one block device per Axon's DDR2 memory bank found
on a system. Block devices are called axonram?, their major and
minor numbers are available in /proc/devices, /proc/partitions or
in /sys/block/axonram?/dev.

source code: