On 2/16/07, Gerd Hoffmann <[email protected]> wrote:
The console subsystem already has an idea of a boot console, using the
CON_BOOT flag. The implementation has some flaws though. The major
problem is that presence of a boot console makes register_console()
ignore any other console devices (unless explicitly specified on the
kernel command line).
This patch fixes the console selection code to *not* consider a boot
console a full-featured one, so the first "normal" console registering
will become the default boot console instead. This way the unregister
call for the boot console in register_console() actually triggers and
the handover from the boot console to the real console device works
smoothly.
The patch also changes the x86 early_printk code to use this. The early
console is simply tagged as boot console, the disable_early_printk()
call is gone as it isn't needed any more.
just notice console handover patch got into mainline 5/8.
for early_uart_console, I have some ideas:
1. merged that into early_serial_console in
arch/x86_64/kernel/early_printk.c, and
move early_printk.c to kernel/, --- make it understand
earlyprintk=uart,io,0x3f8,9600n8
earlyprintk=uart,mmio,0xff5e0000,115200n8
in addition to vga, ttyS, serial
2. or make early_uart_console to be another CON_BOOT, and get rid of
late_initcall(early_uart_console_switch).
actually with late_initcall early_uart_console_switch instead of
console handover, we will lose char output from serial drv init to
late_initcall stage.
in this case, we need to EARLY_SERIAL_CONSOLE to select
early_serial_console or early_uart_console for x86_64 platform.
YH
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