1 files changed, 9 insertions, 2 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4d880b3d1f35..62aab585d9d7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -462,13 +462,20 @@ and is between 256 and 4096 characters. It is defined in the file
                         Documentation/networking/netconsole.txt for an
                         alternative.
 
-                uart,io,<addr>[,options]
-                uart,mmio,<addr>[,options]
+                uart[8250],io,<addr>[,options]
+                uart[8250],mmio,<addr>[,options]
                         Start an early, polled-mode console on the 8250/16550
                         UART at the specified I/O port or MMIO address,
                         switching to the matching ttyS device later.  The
                         options are the same as for ttyS, above.
 
+        earlycon=       [KNL] Output early console device and options.
+                uart[8250],io,<addr>[,options]
+                uart[8250],mmio,<addr>[,options]
+                        Start an early, polled-mode console on the 8250/16550
+                        UART at the specified I/O port or MMIO address.
+                        The options are the same as for ttyS, above.
+
         cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
                         Format:
                         <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]