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Date: Wed, 7 Jul 2010 10:42:42 -0500
From: Scott Wood <scottwood@freescale.com>
To: Shawn Jin <shawnxjin@gmail.com>
Subject: Re: kernel boot stuck at udbg_putc_cpm()
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On Tue, 6 Jul 2010 17:17:16 -0700
Shawn Jin <shawnxjin@gmail.com> wrote:

> >> That was it. The value @0xfa203bf8 is 0x20000001. The kernel
> >> certainly moved forward till it stuck at the new place
> >> cpm_uart_initbd() as shown below.
> >
> > Do you get any output from the serial port? =A0I'd have expected
> > something by the time you get to cpm_uart_initbd() -- in fact, the
> > early output will have been shut down by then to make room for the
> > real serial driver.
>=20
> Nothing new on the serial port. :-( Is the interrupt enabled during
> the early debug stage? I'm not sure if the interrupt controller is set
> properly in DTS. The same MPC875 settings are copied from the
> adder875-uboot.dts.

Interrupts are not used for the early serial output.

>=20
>     Memory <- <0x0 0x8000000> (128MB)
>     ENET0: local-mac-address <- 00:09:9b:01:58:64
>     CPU clock-frequency <- 0x7270e00 (120MHz)
>     CPU timebase-frequency <- 0x393870 (4MHz)
>     CPU bus-frequency <- 0x3938700 (60MHz)
>=20
>     zImage starting: loaded at 0x00400000 (sp: 0x07d1ccd0)
>     Allocating 0x186bdd bytes for kernel ...
>     gunzipping (0x00000000 <- 0x0040c000:0x00591c30)...done 0x173b18
> bytes
>=20
>     Linux/PowerPC load: root=3D/dev/ram
>     Finalizing device tree... flat tree at 0x59e300
>=20
> Here is the kernel log buf dump. Anything suspicious?

Nope, looks normal.

-Scott