Booting linux on MPC custom Board

Lokesh Kumar lokesh.kumar at
Tue Jun 24 02:52:13 EST 2003

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


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

Hi Kumar,
1. change the TEXT_BASE definition in the
   board/yourboardname/ to pointer to sdram
   definition to that address in the
3. comment the BR0 reset in section in
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!

> 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
> the custom bootloader (to be able to boot older app as well). I think I
> two ways to go -
> 1. Custom bootloader enhanced to be able to load Linux. I do not think it
> 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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