[U-Boot-Users] RE: [PPCBoot-users] How to load Linux locally?

Tue Nov 26 14:55:31 CET 2002

Hi Francis,

The best way to debug this is to set an internal hardware breakpoint at
address 0.  Use the terminal window command IHBD 0.  It's easier than using
the GUI.

Start the target running and let UBoot load the kernel.  When it jumps to
location 0, you'll hit the breakpoint and be able to step through the code.
The MMU is turned on very shortly (15-20 lines into the code), so you'll
need to have the visionICE II configured with the CF MMU commands or it will
get lost once translation is turned on.

Good luck,
Joe

-----Original Message-----
From: ppcboot-users-admin at lists.sourceforge.net
[mailto:ppcboot-users-admin at lists.sourceforge.net]On Behalf Of Francis
Yu <francisy at luxn.com>
Sent: Thursday, October 24, 2002 7:14 PM
To: 'Joe Hamman'; Francis Yu <francisy at luxn.com>;
ppcboot-users at lists.sourceforge.net
Subject: RE: [PPCBoot-users] How to load Linux locally?

Joe,
I cannot thank you enough for the following step-by-step instructions that
you have listed so clearly. It works! I am so happy to observe that the
PPCBOOT decompressed the kernel image at the location that I have downloaded
and see the message "## Transferring control to Linux (at address 00000000)
...". But soon it died inside "InstructionTLBMiss". This would be a question
not belonging here...
Any way, as Wolfgang has been repeatedly stating "RTFM!!!". I guess I am
simply overwhelmed with so much information out there that sometimes it is
difficult to sift through them all to get the right answer.
Once again, thanks to all you folks.
Francis

-----Original Message-----
From: Joe Hamman [mailto:joe.hamman at embeddedspecialties.com]
Sent: Wednesday, October 23, 2002 6:12 AM
To: francisy at luxn.com; ppcboot-users at lists.sourceforge.net
Subject: RE: [PPCBoot-users] How to load Linux locally?

Hi Francis,

If you cannot use ethernet, do it this way:

Put the linux build environment back to its original form.

Make pImage - this generates the file zImage, packaged with the mkimage
utility.  PPCboot knows this format.  If the kernel distribution you are
using does not support this, get one that does.

Convert pImage to a .bdx file using visionCLICK.

Go into the project configuration, go to the Load Options tab, and set the
Apply +/- Bias to something like 100000.  Don't forget to check the box to
enable the bias.  Save and exit the project configuartion dialog.

Reboot the board (INN;GO <RETURN> at the BKM> prompt).

Stop the PPCboot autoloader (if it is enabled) and get to the PPCboot
prompt.

In visionCLICK, stop the target (click on the stop sign icon or type 'ha' or
'halt' at the RUN> prompt).

Then use the 'File | Load A Target Image' pulldown in visionCLICK to load
the pImage.bdx.

Start PPCboot running from where it left off (click on the green light icon
or type 'go' at the BKM> prompt).

At the PPCboot prompt, type 'imi 0x100000' to see if it recognizes the image
you just loaded into ram.

If recognized, use the 'bootm 0x100000' command to have PPCboot uncompress
and launch the image.

Don't forget to read all the docs on www.denx.de.

Good luck!
Joe

-----Original Message-----
From: ppcboot-users-admin at lists.sourceforge.net
[mailto:ppcboot-users-admin at lists.sourceforge.net]On Behalf Of Francis
Yu <francisy at luxn.com>
Sent: Tuesday, October 22, 2002 6:31 PM
To: 'ppcboot-users at lists.sourceforge.net'
Subject: [PPCBoot-users] How to load Linux locally?

Hi!

After spending some time to modified the files for my custom PPC board, I
finally got the ppcboot up and running ( to some degree). I programmed the
ppcboot in flash at 0xfff0,0000, and after resetting the board the ppcboot
will tell me that I have 16M DRAM starting at 0 to 0x00ff,ffff, and the
ppcboot has relocated itself to 0x00fc,0000. If I hit any key at this time
it stops the boot request and gets into the command mode, waiting for the
user input. My next step is to try to load Linux locally without using FTP.

I have built the vmlinux.srec and convert it into the bin format using the
VisionClick ( yes, I do not have the BDI2100 but believe me I would have
gotten one if the darn economy is not this bad!) The original address is
linked at 0xc000,0000, but since I do not have any memory there I tried to
build the vmlinux by modifying the KERNELLOAD to be 0x0080,0000, then loaded
it to RAM using the VisionProbe. I then use the GO command of the ppcboot to
jump to 0x0080,0000. As expected, it crashed.

1/ Is the Linux kernel always linked at 0xC000,0000? What if I do not have
any memory there?

2/ In reading section 6 of the PPCBOOT's document, "Booting Embedded Linux",
is the embedded Linux in this case means the compressed Linux kernel plus
the bootstrap and decompressor, otherwise known as the Zimage or Pimage?

3/ I tried to use the bootm command to boot the "embedded kernel", (I guess
it would be the zimage which I have loaded into RAM at location 0x0040,0000)
but it returned with the "Bad Magic Number" message. How do I build the
zimage so that I could pass this stage?

I know that I am testing your patience with my stupid questions, which seems
so obvious to most of you, but for a guy who is new in this area, please
bear with me. Thanks

Francis Yu
francisy at luxn.com

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