RE: Booting linux on MPC custom Board

Thanks a lot. I am going to follow your advice and start rolling.

Lokesh

-----Original Message-----
From: li [mailto:<redacted>]
Sent: Monday, June 23, 2003 12:45 PM
To: Lokesh Kumar
Cc: <redacted>
Subject: Re: Booting linux on MPC custom Board


Hi Kumar,
1. change the TEXT_BASE definition in the
   board/yourboardname/config.mk to pointer to sdram
   base
2. change the CFG_FLASH_BASE and CFG_MONITOR_BASE
   definition to that address in the
   include/config_yourboardname.h
3. comment the BR0 reset in section in
   cpu/mpc8xx/cpu_init.c
4. comment the sdram init function(initdram), just set
   the ram size manually
now, you can compile the ppcboot, and download the ppcboot.bin to the
address which the TEXT_BASE point to and make it run.
Good Luck!
Li

Hi,
I have a custom board with a custom bootloader. The board is based on
MPC855T, with 8MB flash and 32MB RAM.

I have to boot linux on this board. The issue I have is this - I have to

use

the custom bootloader (to be able to boot older app as well). I think I

have

two ways to go -

1. Custom bootloader enhanced to be able to load Linux. I do not think it

is

faster approach given the time required.

2. Tell custom bootloader to load another bootloader like PPCBOOT (U-BOOT)
and then let it load Linux. Now, to go this route, I will have to run
PPCBOOT from RAM. Reading documentation of PPCBOOT, it says that it runs
from FLASH and relocates itself to RAM.
	How can run PPCBOOT from RAM directly and then tell it to load
Linux?? Any HELP would be appreciated.


Lokesh Kumar
Wireless Matrix USA Inc.
703-262-4032

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