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| author | Yinghai Lu <Yinghai.Lu@Sun.COM> | 2007-07-16 08:37:59 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 18:05:35 +0200 |
| commit | 18a8bd949d6adb311ea816125ff65050df1f3f6e (patch) | |
| tree | 4365db908430747a5c08cacdb4354577b7bfead7 /drivers/firmware | |
| parent | x86: initial fixmap support (diff) | |
| download | linux-18a8bd949d6adb311ea816125ff65050df1f3f6e.tar.xz linux-18a8bd949d6adb311ea816125ff65050df1f3f6e.zip | |
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 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/pcdp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c index 2b4b76e8bd72..58e9f8e457f8 100644 --- a/drivers/firmware/pcdp.c +++ b/drivers/firmware/pcdp.c @@ -15,6 +15,7 @@ #include <linux/console.h> #include <linux/efi.h> #include <linux/serial.h> +#include <linux/serial_8250.h> #include <asm/vga.h> #include "pcdp.h" @@ -27,7 +28,7 @@ setup_serial_console(struct pcdp_uart *uart) char parity; mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); - p += sprintf(p, "console=uart,%s,0x%lx", + p += sprintf(p, "uart8250,%s,0x%lx", mmio ? "mmio" : "io", uart->addr.address); if (uart->baud) { p += sprintf(p, ",%lu", uart->baud); @@ -41,7 +42,8 @@ setup_serial_console(struct pcdp_uart *uart) } } - return early_serial_console_init(options); + add_preferred_console("uart", 8250, &options[9]); + return setup_early_serial8250_console(options); #else return -ENODEV; #endif |