[U-Boot] [PATCH/RFC] mx28: print bootmode with cpuinfo

[Matthias Fuchs <matthias.fuchs@esd.eu>]

On 23.01.2012 21:33, Fabio Estevam wrote:
> Hi Matthias,
> 
> On 1/18/12, Matthias Fuchs <matthias.fuchs@esd.eu> wrote:
>> Hi,
>>
>> while playing around with the mx28evk and differnet bootmedia
>> I found it helpful to see the current bootmode without
>> running to the board and checking it's switches. Also
>> some other CPU (e.g. 440 PowerPCs) print some kind of bootstrap
>> configuration during startup.
>>
>> The patch probably needs some little cleanup. But the main issue might
>> be the way how it passes the information from SPL to 2nd stage.
>> I am note sure if those scratch registers are somehow holy :-)
> 
> I tested your patch and it worked fine.
> 
> What I really liked about it is that it fixed a real issue that I was seeing:
> after booting the kernel and issuing a "reboot"command, kernel did
> shutdown, reset the system, but then U-boot got stuck showing "DRAM: 0
> bytes".
Hmm ...
> 
> So maybe you could split this patch in two parts:
> 
> - One patch that touches the HW_DIGCTRL_SCRATCH register (this part is
> what fixed the RAM size retrievel after a "reboot" in the kernel
And what is this part? I was not aware of this issue. What exactly part
of my patch fixes this issue?

And finally I am not sure if we should use the scratch registers for
passing the boot mode at all.

Matthias