Booting linux on MPC custom Board

[Lokesh Kumar]

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

Lokesh

-----Original Message-----
From: li [mailto:slowforce at 21cn.com]
Sent: Monday, June 23, 2003 12:45 PM
To: Lokesh Kumar
Cc: linuxppc-embedded at lists.linuxppc.org
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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