From 18a8bd949d6adb311ea816125ff65050df1f3f6e Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Sun, 15 Jul 2007 23:37:59 -0700 Subject: 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: Cc: Andi Kleen Cc: Bjorn Helgaas Cc: Russell King Cc: Gerd Hoffmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/serial.h | 6 ------ 1 file changed, 6 deletions(-) (limited to 'include/linux/serial.h') diff --git a/include/linux/serial.h b/include/linux/serial.h index 33fc8cb..deb7143 100644 --- a/include/linux/serial.h +++ b/include/linux/serial.h @@ -177,11 +177,5 @@ struct serial_icounter_struct { #ifdef __KERNEL__ #include -/* 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 */ -- cgit v1.1