[PATCH] Documentation: Add "earlycon=sbi" to the admin guide

[Palmer Dabbelt]

This argument is supported on RISC-V systems and widely used, but was
not documented here.

Signed-off-by: Palmer Dabbelt <pal...@sifive.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt 
b/Documentation/admin-guide/kernel-parameters.txt
index 4c1971960afa..ca437381f91f 100644
--- 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>
-- 
2.21.0