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| author | Aleksey Makarov <aleksey.makarov@linaro.org> | 2016-09-27 23:54:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-28 17:46:46 +0200 |
| commit | ad1696f6f09daacfdf2bf04bc83cd8f48d80e34a (patch) | |
| tree | 5621bb984dfcd615ce17180fd00f08d8163eb756 /include/linux/acpi.h | |
| parent | d503187b6cc4e41c21c02e695e0e7b5acdd066de (diff) | |
| download | lwn-ad1696f6f09daacfdf2bf04bc83cd8f48d80e34a.tar.gz lwn-ad1696f6f09daacfdf2bf04bc83cd8f48d80e34a.zip | |
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 <aleksey.makarov@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/acpi.h')
| -rw-r--r-- | include/linux/acpi.h | 6 |
1 files changed, 6 insertions, 0 deletions
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*/ |