[U-Boot-Users] A question about sdram_init
wd at denx.de
Fri May 14 09:35:06 CEST 2004
In message <BAY2-F138np7Y5pnryM00015182 at hotmail.com> you wrote:
> OK, the system I am using is PPC405 custom board. The board is same as
> WALNUT but install a special purpose I/F in ASIC. That's why I said it is
> similiar as WALNUT. Since that part won't interfere others, it can be
> considered same as WALNUT. The board has 8M bytes SDRAM installed. SDRAM
Does it use exactly the same RAM chips as the walnut?
> I know. But my boss keep saying learnning to use the debugger is
> time-consuming and refused to buy a debugger for me, which really pissed me
Your boss is of course right. Learning how to use a debugger is
Maybe nobody told him that working without a debugger is even more
time-consuming, and he will lose this time again and again, while the
learning part is needed only once.
> off. Sigh... But this is the reality - I don't have a debugger and have to
> have to have the u-boot run on my system within one week...
This is probably where he "hire a guru" part of the porting guide
> Well, my purpose is just to find out why the 3rd instructions can not get
> through. So I just strip everything which is temporary is not related to
> this purpose. Do you think udelay can be a cause? I really doubt it because
> I've tried both occasions but none of them works.
U-Boot doesn't work this way. I think it will be very difficult to
get it working when you stumble from line to line, without tools or
understanding what's going on. There is a 95% chance that after
solving this problem, your system will hang during or after relo-
cation to RAM.
Try to understand what the code is doing, and if it actually fits
BTW: are you absolutely sure your hardware is working at all?
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
Emotions are alien to me. I'm a scientist.
-- Spock, "This Side of Paradise", stardate 3417.3
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