no output to serial console from /init process on ml405

[Anton Kowalski]

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 <MBenedict at twacs.com> wrote:
> 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
> > _______________________________________________
> > Linuxppc-embedded mailing list
> > Linuxppc-embedded at ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >
> >
>
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