[ELDK] udbg and early debug support for MPC5200

[Wolfgang Denk]

Dear Chris,

please keep the ML on Cc:


In message <1CD40EAAED4E4B66B0E7436A6A4CD01F at kos> you wrote:
>
> > Which exact kernel version are you using? [git commit id?]
> 
> $ git describe
> v2.6.32-rc5-1449-g2c33dca

I see. Well, I've tested this version on several MPC5200B based boards
without noticing any issues. 

> > Did you adpt the device tree source to your hardware,
> 
> Not yet, it is close enough to the Lite5200B without PCI.

Maybe not clese enough?

> The uImage is the lite5200_defconfig and the .dtb is just a copy of 
> lite5200b.dtb

Try the MPC5200 default configuration instead - mpc5200_defconfig


> >> Argh! It's frustrating that the kernel structure keeps changing.
> > What exactly do you mean?
> 
> I said that partially in jest. It is not a criticism of your fantastic 
> ELDK.
> 
> I have used every version ELDK since 3.1.1. If you look at the changes 
> to implement a board (e.g. Lite5200), there have been many many 
> changes - just a few:
>     - ppc to powerpc
>     - whether to pass console=... or not
>     - drivers change in kernel 2.6 (A BIG ONE!)
>     - the device tree blob
>     - organisation of the processor / boards

Ah, ok - this indeed covers a loooong period and many changes. But
recently - say, since kernel version 2.6.25 - the situation has much
improved.

> As we make custom boards, each change is a potential bug and a new 
> learning curve. I have found that experience gained from an older ELDK 
> does not really help you to know what to change in a newer ELDK due to 
> the changes in the kernel.
> 
> But I understand it is for the greater good. And it keeps me busy :-)

Indeed - us too :-)

Best regards,

Wolfgang Denk

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