Image download problem with gdb and DBI

Image download problem with gdb and DBI

[Freddy Lugo]

Hi,

When I tried to download the kernel image it gives me
the "bad gzipped data" error, I know that this is
caused because the image is not there or the
bootloader has an invalid address.

When I perform a "load" on gdb the output is:

>Loading section .text, size 0x742c lma 0x800000
>Loading section .rodata, size 0x175c lma 0x807430
>Loading section .data, size 0x1b6c lma 0x809000
>Start address 0x800000 , load size 42740
>Transfer rate: 170960 bits/sec, 502 bytes/write.

So the image area is not downloaded, I am assuming
this is the cause of the error.

This are the steps I am executing:
- start gdb using arch/ppc/boot/zvmlinux
- set gdb to work with a remote target (bdi2000)
- load the program (produced the above messages)
- run the program

Other info:
custom board running on a MPC750

What I am doing wrong??

Does the image (vmlinux) should be downloaded apart
from the bootloader?  How I told gdb or bdi2000 to
download the image area?  Is there is a common recipe
for this procedure?

Thanks in advance,

Freddy Lugo


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Re: Image download problem with gdb and DBI

[Wolfgang Denk]

In message <20010430211516.24155.qmail@web9901.mail.yahoo.com> you wrote:
>
> So the image area is not downloaded, I am assuming
> this is the cause of the error.

At least it's part of the problem. Another problem might  be  missing
hardware  initialization  and  parameter  passing.  Usually I let the
firmware initialize the box and load the linux kernel...

> What I am doing wrong??
>
> Does the image (vmlinux) should be downloaded apart
> from the bootloader?  How I told gdb or bdi2000 to

No.

> download the image area?  Is there is a common recipe

The BDI2000 understands  the  Linux  image  format.  Use  the  "load"
command  (with the telnet interface) and the "image" format type (see
section 3.2.3 Part [HOST] of the BDI2000 manual).

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 only way to get rid of a temptation is to yield to it.
                                                        - Oscar Wilde

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Re: Image download problem with gdb and DBI

[Freddy Lugo]

> At least it's part of the problem. Another problem
> might  be  missing
> hardware  initialization  and  parameter  passing.
> Usually I let the
> firmware initialize the box and load the linux
> kernel...

The FORMAT was already set to IMAGE on the bdi2000.
Also I tried to make an autoload (LOAD AUTO) from the
BDI and still the image is not downloaded or could not
be found.  On the gdb, the load doesn't download the
image.

I let the MPC750 used the standard initialization
provided on boot/head.S.

Since the kernel image is not found yet, the MMU is
not set (AFAIK), what other initialization could be
needed in order to permit the image download?

Sorry for all the bothering.  I checked the list but I
didn't find information on the issue.

Thanks,
Freddy Lugo


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