U-Boot question

U-Boot question

[AUBERT Cedric]

Hi,

I am in the state "while(learning){ .... }" of the U-Boot Porting Guide in
the README file.

And there is a point that I don't understand.

The option CFG_SDRAM_BASE is the physical start address of SDRAM.

Okay, I understand that. But it's written _Must_ be 0 here.

How can I do if my SDRAM ( on a MPC860 Board ) start at 04000000 ???

Thanks a lot

PS : Sorry to don't post to the U-Boot mailing list but I have a failure
notice each time
I try to post on it. (550-Envelope sender verification failed)

---
AUBERT Cedric
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Tel : +33 (0)2 40 84 50 00
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E-mail : cedric_aubert@softhome.net
Web : http://www.controle-commande.sdel.fr

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: U-Boot question

[Wolfgang Denk]

In message <NEEAIENMOLHNBKKFKIDMMEEICAAA.cedric_aubert@softhome.net> you wrote:
>
> I am in the state "while(learning){ .... }" of the U-Boot Porting Guide in
> the README file.
...
> The option CFG_SDRAM_BASE is the physical start address of SDRAM.
> Okay, I understand that. But it's written _Must_ be 0 here.

Right. Linux on PowerPC expects RAM to start at 0.

> How can I do if my SDRAM ( on a MPC860 Board ) start at 04000000 ???

Just define a memory map where your SDRAM starts  at  0.  The  memory
controller is programmed in software, so you can chose any memory map
you like.

> PS : Sorry to don't post to the U-Boot mailing list but I have a failure
> notice each time
> I try to post on it. (550-Envelope sender verification failed)

Then fix this!


Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
The use of Microsoft crippleware systems is a sin that  carries  with
it its own punishment.
         -- Tom Christiansen in <6bo3fr$pj8$5@csnews.cs.colorado.edu>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

u-boot question

[Lei Sun]

Hi all:
  Is this the right list to ask for U-BOOT related question? If it's
not, please igore it and direct me to the right list.
  I am trying to bring up a custom designed board based on MPC8270,
after spent 3 weeks on fixing hardware issues (extreme surgery !) , I
finally be able to read something out of the flash and verified SDRAM
is working as well. Up to this point our JTAG debugger is dead! I
burned u-boot Image using a programmer and put it in. after power up
and did a PORESET, I found out that every 20 seconds or so , system
generated HRESET,( by measuring the HRESET pin of the JTAG port). It
does read Hardware Reset Config Word when reset happens (I saw pulse
on the CS0 pin).  Before the JTAG die, i was able to issue "reset"
command through it and found out the PC stays at 0x100,  but issue
"go" command , the PC became 0x000000fc and hangs.
  My questions are :
1. What's the best way to verify that CPU read correct HRCW ?
2. Any good JTAG debugger for this family of CPU you can recommend ?
We bought Gaurdian-SE from etoolsmith (the company no longer exsit!)
which really sucks!

Thanks!
lei

Re: u-boot question

[Frank]

--- Lei Sun <leisun124@gmail.com> wrote:

> Hi all:
>   Is this the right list to ask for U-BOOT related question?
> If it's
> not, please igore it and direct me to the right list.
>   I am trying to bring up a custom designed board based on
> MPC8270,
> after spent 3 weeks on fixing hardware issues (extreme surgery
> !) , I
> finally be able to read something out of the flash and
> verified SDRAM
> is working as well. Up to this point our JTAG debugger is
> dead! I
> burned u-boot Image using a programmer and put it in. after
> power up
> and did a PORESET, I found out that every 20 seconds or so ,
> system
> generated HRESET,( by measuring the HRESET pin of the JTAG
> port). It
> does read Hardware Reset Config Word when reset happens (I saw
> pulse
> on the CS0 pin).  Before the JTAG die, i was able to issue
> "reset"
> command through it and found out the PC stays at 0x100,  but
> issue
> "go" command , the PC became 0x000000fc and hangs.
>   My questions are :
> 1. What's the best way to verify that CPU read correct HRCW ?
> 2. Any good JTAG debugger for this family of CPU you can
> recommend ?
> We bought Gaurdian-SE from etoolsmith (the company no longer
> exsit!)
> which really sucks!

Buy a Abatron BDI2000...

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