On Wed, 27 Aug 2008, Scott Wood wrote:
On Wed, Aug 27, 2008 at 02:30:47PM +0100, Chris Skepper wrote:
I just left CONFIG_PPC_EARLY_DEBUG_CPM_ADDR at the default value for CPM2?
Is that likely to be correct for SMC1? (I tried looking in the MPC8272
reference manual, but couldn't find it.)
The value depends on how the port was set up by firmware (or by the
bootwrapper). It should be set to wherever the descriptor is, and there
should only be one descriptor that loops back on itself.
Hi Scott,
Thanks so much for your help so far. I was able to find out this address
from the bootloader and get some output on the early debug console which
was very pleasing. It now gets as far as console_init() called from
init/main.c, which completes but then any printk seems to stall it and
you get no more output.
I am using SMC1 and have this in the DTS file for the linux,stdout-path:
[EMAIL PROTECTED] {
device_type = "serial";
compatible = "fsl,mpc8247-smc-uart",
"fsl,cpm2-smc-uart";
reg = <0x11a80 0x20 0x87fc 2>;
interrupts = <4 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <7>;
fsl,cpm-command = <0x1d000000>;
};
Any ideas what sorts of things I should check next?
Cheers,
Chris.
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