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| author | Yinghai Lu <Yinghai.Lu@Sun.COM> | 2007-07-15 23:37:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:35 -0700 |
| commit | 18a8bd949d6adb311ea816125ff65050df1f3f6e (patch) | |
| tree | 4365db908430747a5c08cacdb4354577b7bfead7 /arch | |
| parent | b1c931e39327ef121797927d4b3198d370e75b9b (diff) | |
| download | op-kernel-dev-18a8bd949d6adb311ea816125ff65050df1f3f6e.zip op-kernel-dev-18a8bd949d6adb311ea816125ff65050df1f3f6e.tar.gz | |
serial: convert early_uart to earlycon for 8250
Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and
include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in
serial initializing stage. the console_init=>serial8250_console_init=>
register_console=>serial8250_console_setup will return -ENDEV, and console
ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in
drivers/serial/serial_core.c to call register_console to get console ttyS0.
that is too late.
Make early_uart to use early_param, so uart console can be used earlier. Make
it to be bootconsole with CON_BOOT flag, so can use console handover feature.
and it will switch to corresponding normal serial console automatically.
new command line will be:
console=uart8250,io,0x3f8,9600n8
console=uart8250,mmio,0xff5e0000,115200n8
or
earlycon=uart8250,io,0x3f8,9600n8
earlycon=uart8250,mmio,0xff5e0000,115200n8
it will print in very early stage:
Early serial console at I/O port 0x3f8 (options '9600n8')
console [uart0] enabled
later for console it will print:
console handover: boot [uart0] -> real [ttyS0]
Signed-off-by: <yinghai.lu@sun.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/kernel/setup.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c index 188fb73..4d9864c 100644 --- a/arch/ia64/kernel/setup.c +++ b/arch/ia64/kernel/setup.c @@ -390,10 +390,6 @@ early_console_setup (char *cmdline) if (!efi_setup_pcdp_console(cmdline)) earlycons++; #endif -#ifdef CONFIG_SERIAL_8250_CONSOLE - if (!early_serial_console_init(cmdline)) - earlycons++; -#endif return (earlycons) ? 0 : -1; } |
