ACPI Serial Port Console Redirection Support

modulename: spcr.ko

configname: CONFIG_ACPI_SPCR_TABLE

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>ACPI Serial Port Console Redirection Support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Enable support for Serial Port Console Redirection (SPCR) Table.
This table provides information about the configuration of the
earlycon console.

source code:
depends
CONFIG_ACPI