Re: printk

[Pete Popov <ppopov@pacbell.net>]

John D. Davis wrote:
> Does anyone know off hand, the earlies point that I can use printk?  

Well, you can use them from the very beginning, but you won't see the 
output until after serial console init (if you're using a serial console).

> I added some printk statements to driver/char/console.c and the resulting
> kernel hangs with only the logo showing and no text.  Is prom_printf
> something that I should use instead. I put some printk statements in
> tty_io.c and kernel/printk.c and those compiled kernels work.

I like using simple puts and put32 routines that print a string and a 32 
bit number.  These routines bang directly on the uart so you see the 
prints immediately, before printk works.  Take a look at 
arch/mips/au1000/common/puts.c.

Pete