m68k: Multi-platform EARLY_PRINTK
authorFinn Thain <fthain@telegraphics.com.au>
Sat, 12 Apr 2014 13:48:56 +0000 (23:48 +1000)
committerGeert Uytterhoeven <geert@linux-m68k.org>
Wed, 28 May 2014 08:10:04 +0000 (10:10 +0200)
commit7913ad1ad83409e7f9ed5758bb4324bf64c95a73
tree562d7acf6b0ab016a1c7ca3cbfe9cd4ed9f8f9ab
parent97f3f68c21fb5edaf4503b9aef6beefddf316d76
m68k: Multi-platform EARLY_PRINTK

Make the boot console available to more m68k platforms by leveraging
the head.S debug console.

The boot console is enabled by the "earlyprintk" command line argument
which is how most other architectures do this.

This is a change of behaviour for the Mac but does not negatively impact
the common use-case which is not debugging.

This is also a change of behaviour for other platforms because it means
the serial port stays quiet when CONFIG_EARLY_PRINTK is not enabled. This
is also an improvement for the common use-case.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stephen N Chivers <schivers@csc.com.au>
[Geert: CONSOLE_DEBUG should depend on CONFIG_FONT_SUPPORT]
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Documentation/kernel-parameters.txt
arch/m68k/Kconfig.debug
arch/m68k/kernel/Makefile
arch/m68k/kernel/early_printk.c [new file with mode: 0644]
arch/m68k/kernel/head.S
arch/m68k/mac/config.c