Documentation: admin-guide: add earlycon documentation for RISC-V

Kernels booting on RISC-V can specify "earlycon" with no options on the Linux command line, and the generic DT earlycon support will query the "chosen/stdout-path" property (if present) to determine which early console device to use. Document this appropriately in the admin-guide. Signed-off-by: Paul Walmsley <[email protected]> Reviewed-by: Geert Uytterhoeven <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Andreas Schwab <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
vieko · Oct 10, 2019 · 7f70ae5 · 7f70ae5
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diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
@@ -988,6 +988,10 @@
 			chosen node or the ACPI SPCR table if supported by
 			the platform.
 
+			[RISCV] When used with no options, the early
+			console is determined by the stdout-path
+			property in the device tree's chosen node.
+
 		cdns,<addr>[,options]
 			Start an early, polled-mode console on a Cadence
 			(xuartps) serial port at the specified address. Only