no output to serial console from /init process on ml405

[Benedict, Michael]

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

> -----Original Message-----
> From: 
> linuxppc-embedded-bounces+mbenedict=twacs.com at ozlabs.org 
> [mailto:linuxppc-embedded-bounces+mbenedict=twacs.com at ozlabs.o
rg] On Behalf Of Anton Kowalski
> Sent: Wednesday, August 08, 2007 6:28 AM
> To: linuxppc-embedded at 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 <maxk at qualcomm.com>
> [    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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