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