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Subject[PATCH] 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

Signed-off-by: Paul Walmsley <>
Cc: Geert Uytterhoeven <>
Cc: Christoph Hellwig <>
Cc: Andreas Schwab <>
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 c7ac2f3ac99f..011fee969ece 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -990,6 +990,10 @@
[X86] When used with no options the early console is
determined by the ACPI SPCR table.

+ [RISCV] When used with no options, the early
+ console is determined by the stdout-path
+ property in the device tree's chosen node.
Start an early, polled-mode console on a Cadence
(xuartps) serial port at the specified address. Only
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