How to boot u-boot from RAM

How to boot u-boot from RAM

[Junita Ajith]

Hi

I am trying to have a different version of UBoot
with some utilities added to it . So I'm trying to
figure out a way to check if that upgraded version of
UBoot works fine , without copying it to the default
location where my original UBoot resides in the flash

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How to boot U-Boot from RAM

[Junita Ajith]

Hi

I am trying to have a different version of UBoot with some utilities
added to it. So I'm trying to figure out a way to check if that upgraded
version of UBoot works fine, without copying it to the default location
where my original UBoot resides in the flash. I am using a 8540 board.

   I changed the linker file u-boot.lds, by mapping it all to RAM
locations. When I compiled it, I could get the final U-Boot image
u-boot.bin of size 154KB.

  I tried to tftp to 0x2000000 of RAM and said go, it hangs (always I
have acopy of the working UBoot image in my default Flash location).

The disassembly of both the UBoot images seems to be the same, except
that in the binary I couldn't see the image header in a readable for the
upgraded image, where as I could see that for the original U-Boot.

I guess may be as the original u-boot has intialised the ports..TLBs
etc, it clashes. I am not sure but...

     All I need to know is how do we run the UBoot from RAM, without
using flash. Any help would be appreciated.

Thanks
Junita

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Re: How to boot u-boot from RAM

[Wolfgang Denk]

In message <20040813010711.41665.qmail@web53709.mail.yahoo.com> you wrote:
>
> I am trying to have a different version of UBoot

Why are you asking the very same question within just  3  hours  with
different  subjects  on the same mailing list - and on a mailing list
where your questions is off topic?

Please ask U-boot related stuff on the U-Boot-Users mailing list.

But please check the mailing list archive _before_ asking.

> with some utilities added to it . So I'm trying to
> figure out a way to check if that upgraded version of
> UBoot works fine , without copying it to the default
> location where my original UBoot resides in the flash

This has been discussed many, many times before. Search  the  mailing
list archive (on gmane).

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
Mirrors should reflect a little before throwing back images.
- Jean Cocteau

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

Re: How to boot U-Boot from RAM

[Wolfgang Denk]

In message <20040813052042.77792.qmail@web53703.mail.yahoo.com> you wrote:
>
> I am trying to have a different version of UBoot with some utilities
> added to it. So I'm trying to figure out a way to check if that upgraded
> version of UBoot works fine, without copying it to the default location
> where my original UBoot resides in the flash. I am using a 8540 board.

Please read the U-Boot mailing list archive (searchable @ gmane), and
let's continue this discussion (if at all) on the U-Boot-Users list.

>      All I need to know is how do we run the UBoot from RAM, without
> using flash. Any help would be appreciated.

We don't. Period. This has been explained on the  mailing  list  many
times before. Please read the mailing list archive.

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
There are very few personal problems that cannot be solved through  a
suitable application of high explosives.

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