Messages in this thread | | | Date | Wed, 16 May 2007 09:29:11 -0700 | From | "Yinghai Lu" <> | Subject | Re: [patch] early printk and boot console fixups. |
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On 5/16/07, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote: > On Tuesday 15 May 2007 10:17:50 pm Yinghai Lu wrote: > > 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 > > I would rather try to merge 8250_early and early_printk. > "console=uart,io,0x3f8" is already pretty similar to > "earlyprintk=serial", and it would be nice to have only one. > > "console=uart" does have the disadvantage that you have to know the > port address. But it has the advantage that it doesn't depend on > compiled-in legacy serial port names. If you need early console > output, you're probably a developer and can come up with the address. > > I think it would be nice to have a "console=vga". That could use > the current "earlyprintk=vga" implementation, and automatically > hand off to tty0. > > Then we could remove "earlyprintk=" and always use "console=uart" > or "console=vga".
earlyprintk= is needed for seeting bootconsole, or setting CON_BOOT, and it is could be loaded earlier with early_param than console_init.
in the console_init (via register_console), the console is handed over from bootconsole to normal console.
also console_init could be moved to quite late than current, and till some subsystem is initialized like pci and usb.
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