[U-Boot-Users] SDRAM init problem? Was Re: uboot 1.1.2 problem

[Sam Song]

-- Wolfgang Denk <wd at denx.de> wrote:
> > Thanks. Actually, it involves the grey area which
> > a probelm was supposed to produce by hardware or 
> > software. The golden role is to check SW first.
> 
> You must be one of these hardware guys who always
> blame the software.

Firmware guys is better to me. I amn't willing to 
be an native HW fellow although I come from HW 
field. To blame right is my hope. SW is only one
side:-)

[snip]
> We've seen lots of "funny" problems with the many
> boards we lay hands on. Three more things to check:
> 
> * Check the voltages on your system: tolerances ok?
> spikes  or  other noise on the lines? especially 
> close to the CPU?
> * Check the clocks. Check the clocks again.
> * check for unconnected pins, missing pull-ups or
> -downs, or incorrect resistor values

Ummm, this is really what I want. It seems I should
look back more to take case HW side:-)

Thanks so much,

Sam

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