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tty/serial: pl011: add generic earlycon support

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Add earlycon support for the pl011 serial port. This allows enabling
the pl011 for console when early_params are processed. This is based
on the arm64 earlyprintk support and is intended to replace it.

Signed-off-by: Rob Herring <[email protected]>
Cc: Russell King <[email protected]>
Cc: Jiri Slaby <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Rob Herring 2014-04-18 17:19:57 -05:00 • committed by Greg Kroah-Hartman
commit 0d3c673e78
3 changed files with 37 additions and 1 deletions
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7
Documentation/kernel-parameters.txt
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@ -883,6 +883,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
which are not unmapped.
earlycon= [KNL] Output early console device and options.
uart[8250],io,<addr>[,options]
uart[8250],mmio,<addr>[,options]
uart[8250],mmio32,<addr>[,options]
@ -892,6 +893,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
(mmio) or 32-bit (mmio32).
The options are the same as for ttyS, above.
pl011,<addr>
Start an early, polled-mode console on a pl011 serial
port at the specified address. The pl011 serial port
must already be setup and configured. Options are not
yet supported.
earlyprintk= [X86,SH,BLACKFIN,ARM]
earlyprintk=vga
earlyprintk=efi