diff options
| 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 /include/linux | |
| parent | b1c931e39327ef121797927d4b3198d370e75b9b (diff) | |
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 'include/linux')
| -rw-r--r-- | include/linux/console.h | 2 | ||||
| -rw-r--r-- | include/linux/serial.h | 6 | ||||
| -rw-r--r-- | include/linux/serial_8250.h | 4 |
3 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index 62ef6e11d0d2..c44d3dfde7a5 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -99,6 +99,7 @@ struct console { struct tty_driver *(*device)(struct console *, int *); void (*unblank)(void); int (*setup)(struct console *, char *); + int (*early_setup)(void); short flags; short index; int cflag; @@ -107,6 +108,7 @@ struct console { }; extern int add_preferred_console(char *name, int idx, char *options); +extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options); extern void register_console(struct console *); extern int unregister_console(struct console *); extern struct console *console_drivers; diff --git a/include/linux/serial.h b/include/linux/serial.h index 33fc8cb8ddfb..deb714314fb1 100644 --- a/include/linux/serial.h +++ b/include/linux/serial.h @@ -177,11 +177,5 @@ struct serial_icounter_struct { #ifdef __KERNEL__ #include <linux/compiler.h> -/* Allow architectures to override entries in serial8250_ports[] at run time: */ -struct uart_port; /* forward declaration */ -extern int early_serial_setup(struct uart_port *port); -extern int early_serial_console_init(char *options); -extern int serial8250_start_console(struct uart_port *port, char *options); - #endif /* __KERNEL__ */ #endif /* _LINUX_SERIAL_H */ diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 71310d80c09a..706ee9a4c80c 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -60,4 +60,8 @@ void serial8250_unregister_port(int line); void serial8250_suspend_port(int line); void serial8250_resume_port(int line); +extern int serial8250_find_port(struct uart_port *p); +extern int serial8250_find_port_for_earlycon(void); +extern int setup_early_serial8250_console(char *cmdline); + #endif |