[PATCH v11 2/4] ACPI: parse SPCR and enable matching console
leif.lindholm at linaro.org
Mon Sep 11 04:05:22 PDT 2017
I'm afraid Aleksey is no longer assigned to Linaro (you will probably
have seen a bounce).
On Mon, Sep 11, 2017 at 11:11:49AM +0200, Andreas Schwab wrote:
> On Sep 27 2016, Aleksey Makarov <aleksey.makarov at linaro.org> wrote:
> > 'ARM Server Base Boot Requiremets'  mentions SPCR (Serial Port
> > Console Redirection Table)  as a mandatory ACPI table that
> > specifies the configuration of serial console.
> > Defer initialization of DT earlycon until ACPI/DT decision is made.
> > Parse the ACPI SPCR table, setup earlycon if required,
> > enable specified console.
> How can I tell the kernel to ignore this table and use the console on
> the command line instead?
I guess we could just ignore the table completely
like its counterpart in of_console_check().
Like so (not tested beyond compile testing):
diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
index 324b35bfe781..c3cf0f1ebb8f 100644
@@ -96,6 +96,9 @@ int __init parse_spcr(bool earlycon)
+ if (console_set_on_cmdline)
+ return 0;
Are you asking because you want to use a different console in a lab
setup or because there are issues with SPCR on your platform?
More information about the linux-arm-kernel