On Mon, Feb 12, 2018 at 10:18:06AM -0500, Prarit Bhargava wrote:

quoted

But when I specify "earlyprintk=serial,ttyS0,115200" this SPCR crud will
not interfere?

I tested "earlyprintk=serial,ttyS0,115200" on a system which is known to have a
functional console with "console=ttyS0,1152008N1" both with and without
CONFIG_ACPI_SPCR_TABLE enabled.

OK, but my point was that SPCR will never override explicit earlyprintk
stuff. There is absolutely nothing worse than breaking working setups.