printk and

[acurtis at directvinternet.com]

What processor are you using?

I have seen this on 8260 processors because the startup code trys to
reconfigure the clocks and subsequently the baud rate generators. Something
like this is the first thing I would check.

> -----Original Message-----
> From: owner-linuxppc-embedded at lists.linuxppc.org
> [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of Yu
> Bo-BOYU1
> Sent: Monday, November 04, 2002 2:05 PM
> To: Linuxppc-Embedded (E-mail)
> Subject: printk and
>
>
>
> Hi,
>
> The linux object did not go very far on my custom board. As soon as it
> decompress
> itself then it hang silently. The last printout is "Now booting
> the kernel".
>
> I am trying to understand why printk() did not print out even one
> character
> as this
> function is called at very beginning of start_kernel(). I had the
> following
> questions.
>
> 1. What does this statement mean in kernel/printk.c ?
>
> __setup("console=", console_setup);
>
> 2. How does the underneath driver of printk() is initialized? If
> printk() is
> called before
> init_IRQ(). I assume it can only push characters out instead of accepting
> input just
> like putc() or serial_putc() before uncompessing linux. But after intense
> search inside
> linux source code, I am still puzzled...
>
> This is the boot log.
> Starting at 0x800000...
>
> loaded at: 00800000 0089E1BC
> zimage at: 00805870 0089AC70
> avail ram: 00400000 00800000
>
> Linux/PPC load:
> Uncompressing Linux...done.
> Now booting the kernel
>
>
> Thanks.
>
> Bo
>


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