From ad1696f6f09daacfdf2bf04bc83cd8f48d80e34a Mon Sep 17 00:00:00 2001 From: Aleksey Makarov Date: Tue, 27 Sep 2016 23:54:13 +0300 Subject: ACPI: parse SPCR and enable matching console 'ARM Server Base Boot Requiremets' [1] mentions SPCR (Serial Port Console Redirection Table) [2] 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. Thanks to Peter Hurley for explaining how this should work. [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0044a/index.html [2] https://msdn.microsoft.com/en-us/library/windows/hardware/dn639132(v=vs.85).aspx Signed-off-by: Aleksey Makarov Acked-by: Rafael J. Wysocki Reviewed-by: Peter Hurley Tested-by: Kefeng Wang Tested-by: Christopher Covington Signed-off-by: Greg Kroah-Hartman --- include/linux/acpi.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/acpi.h') diff --git a/include/linux/acpi.h b/include/linux/acpi.h index c5eaf2f80a4c..2353827731d2 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1074,4 +1074,10 @@ void acpi_table_upgrade(void); static inline void acpi_table_upgrade(void) { } #endif +#ifdef CONFIG_ACPI_SPCR_TABLE +int parse_spcr(bool earlycon); +#else +static inline int parse_spcr(bool earlycon) { return 0; } +#endif + #endif /*_LINUX_ACPI_H*/ -- cgit v1.2.3