[MPC8272ADS]Cannot start my Linux Kernel

[Scott Wood]

On Wed, Jan 21, 2009 at 06:15:26PM -0800, Daniel Ng99 wrote:
> So the brg node looks like this-
> 
>       brg at 119f0 {
>         compatible = "fsl,mpc8272-brg",
>                      "fsl,cpm2-brg";
>         reg = <0x119f0 0x10 0x115f0 0x10>;
>         clock-frequency = <0>;
> 
> But aren't the BRG registers 32 bits, so shouldn't we use?:
> 
>        reg = <0x119f0 0x20 0x115f0 0x20>;

reg lengths are bytes, not bits.

> -either way, changing these values doesn't seem to make a difference in my
> board's behaviour. Why?

The change above told it that the system has 16 BRGs rather than 8. 
However, this change did not affect the position of the BRG1 register.

> Regarding the following line in the serial at 11a00 node:
> 
> fsl,cpm-brg = <1>;
> 
> -If I change the above number to anything other than 1 (even nonsense like
> '99') then it also seems to work. Why? 

Because BRG1 is already set up by u-boot.

> Adding 'clock-frequency = <0>;' to the brg node doesn't seem to make a
> difference to my board's behaviour.

Try setting it to the actual BRG clock.

-Scott