Re: no output to serial console from /init process on ml405

Indeed I hadn't set up the compulsary links correctly. In reading
through the devices.txt document I realized that I don't have /proc
mounted either. So the following links might not make much sense until
/proc is up.

    slink /dev/fd /proc/self/fd 777 0 0
    slink /dev/stdin /proc/self/fd/0 777 0 0
    slink /dev/stdout /proc/self/fd/1 777 0 0
    slink /dev/stderr /proc/self/fd/2 777 0 0

Thanks for your help.
Anton


On 8/8/07, Benedict, Michael [off-list ref] wrote:

Just a guess, but do you have stdout and friends defined as recommended
in the Compulsory links section of Documentation/devices.txt?
        -Michael

quoted

-----Original Message-----
From:
linuxppc-embedded-bounces+mbenedict=twacs.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+mbenedict=twacs.com@ozlabs.o

rg] On Behalf Of Anton Kowalski

quoted

Sent: Wednesday, August 08, 2007 6:28 AM
To: linuxppc-embedded@ozlabs.org
Subject: no output to serial console from /init process on ml405

Hi All:

I'm trying to bring up linux 2.6.21.1 on an ml405 board. The kernel
boots fine but the init process does not produce any output. The /init
program resides in an initramfs file system and I believe the /dev
device files have been set up correctly. Here's an excerpt from my
initramfs specification:

    dir /dev 755 0 0
    nod /dev/console 644 0 0 c 5 1
    nod /dev/ttyS0 644 0 0 c 4 64

(I am able to open these files from the init program. I tested this by
sleeping for a specified time on success.)

Also, printk continues to function after /init terminates and before
the kernel panics.

Here are the last few lines of the console output:

[    0.507478] Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports,
IRQ sharing disabled
[    0.513862] serial8250.0: ttyS0 at MMIO 0x80201003 (irq =
3) is a 16550A
[    2.927509] RAMDISK driver initialized: 1 RAM disks of 8192K size
1024 blocksize
[    3.018391] tun: Universal TUN/TAP device driver, 1.6
[    3.079115] tun: (C) 1999-2004 Max Krasnyansky [off-list ref]
[    3.154919] mice: PS/2 mouse device common for all mice
[    3.218021] TCP cubic registered
[    3.257034] NET: Registered protocol family 1
[    3.309405] NET: Registered protocol family 17
[    3.363462] Freeing unused kernel memory: 300k init
[   23.488277] Kernel panic - not syncing: Attempted to kill init!
[   23.559517] Rebooting in 180 seconds..<NULL>

I'm using the plb uart and the 8250.c driver. (The obp uartlite driver
didn't work so I switched.) The kernel and the init program were
compiled with eldk.

Any insights into resolving this problem are greatly appreciated.


Anton
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