Documentation: kernel-parameters: Add earlyprintk=bios on SH

Document the use of the "earlyprintk=bios[,keep]" kernel parameter
option on SuperH systems with a SuperH standard BIOS.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/febc920964f2f0919d21775132e84c5cc270177e.1697708489.git.geert+renesas@glider.be
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0a1731a0f0ef373421c0594886c065461ade1064..2b03034207c0f139bc56358d1b4a3c7cedea436a 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1331,6 +1331,7 @@
                        earlyprintk=dbgp[debugController#]
                        earlyprintk=pciserial[,force],bus:device.function[,baudrate]
                        earlyprintk=xdbc[xhciController#]
+                       earlyprintk=bios
 
                        earlyprintk is useful when the kernel crashes before
                        the normal console is initialized. It is not enabled by
@@ -1361,6 +1362,8 @@
 
                        The sclp output can only be used on s390.
 
+                       The bios output can only be used on SuperH.
+
                        The optional "force" to "pciserial" enables use of a
                        PCI device even when its classcode is not of the
                        UART class.