printk and

[Yu Bo-BOYU1]

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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