CONFIG_DEBUG_UNCOMPRESS is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Enable decompressor debugging via DEBUG_LL output


Linux Kernel Configuration
└─>Enable decompressor debugging via DEBUG_LL output
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option influences the normal decompressor output for
multiplatform kernels. Normally, multiplatform kernels disable
decompressor output because it is not possible to know where to
send the decompressor output.

When this option is set, the selected DEBUG_LL output method
will be re-used for normal decompressor output on multiplatform