Documentation: Add "earlycon=sbi" to the admin guide

This argument is supported on RISC-V systems and widely used, but was not documented here. Signed-off-by: Palmer Dabbelt <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
wangyan0507 · Sep 14, 2019 · 82f12ab · 82f12ab
1 parent 19ad5f7
commit 82f12ab
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diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
@@ -1044,6 +1044,10 @@
 			specified address. The serial port must already be
 			setup and configured. Options are not yet supported.
 
+		sbi
+			Use RISC-V SBI (Supervisor Binary Interface) for early
+			console.
+
 		smh	Use ARM semihosting calls for early console.
 
 		s3c2410,<addr>