Debug Filesystem

modulename: bootrom.ko

and/or

regmap-debugfs.ko

and/or

debugfs.ko

and/or

me-debugfs.ko

and/or

segment.ko

and/or

timekeeping_debug.ko

configname: CONFIG_DEBUG_FS

Linux Kernel Configuration
└─>Kernel hacking
└─>Compile-time checks and compiler options
└─>Debug Filesystem
In linux kernel since version 2.6.12  
debugfs is a virtual file system that kernel developers use to put
debugging files into. Enable this option to be able to read and
write to these files.

For detailed documentation on the debugfs API, see
source code:
arch/mips/ralink/bootrom.c