Re: [ECOS] MPC860 Porting (ROM/Flash)

[nprasad3 at gmu dot edu]

----- Original Message -----
From: Gary Thomas <gary@mlbassoc.com>
Date: Thursday, December 11, 2003 3:07 pm
Subject: Re: [ECOS] MPC860 Porting (ROM/Flash)

> On Thu, 2003-12-11 at 10:28, Viswanath Bandi wrote:
> > Right now, I am just trying to get RedBoot running on the board. 
> After> making the changes as mentioned in the porting guide, I am 
> able to
> > compile and make redboot.srec. But when I program the flash and 
> power on,
> > nothing happens. Guess i need to look more closely at .S file. 
> Can you
> > suggest me on how the platform initialization part is typically 
> modified?> I tried to look at it but it's very confusing and 
> didn't know where to 
> > start.

You should be having a file mbx860.S or something like that. Thats your basic hardware initialization that control will come to after reset.Make sure chip selects for Rom,Ram are setup correctly with their timing parameters etc. without which there will be no way to create stack space required.

> 
> Try looking at some of the other platforms which use the 860, e.g. 
> viper
> > 
> > One quick question, can I use gdb & redboot.elf file to see what is
> > going on? Because, when I run it using gdb, it dies saying 
> privileged> instruction.
> 
> Using GDB to debug ROM/FLASH code is pretty tough.  If you have 
> some 
> sort of debug unit (BDM) then you could possibly load code into RAM
> and test that.  It's often much easier to get stuff going that way 
> thanblowing ROM/FLASH images all the time.
> 
Get a BDM (Wiggler) worked for me. Eprom emulator is very handy if you can afford one!

Good Luck!
Nirmal

> > 
> > 
> > Thanks for your time,
> > Viswanath Bandi
> > 
> > Gary Thomas wrote:
> > 
> > >Note: there may be something wrong with your email tool - I 
> received> >this message 4 times!
> > >
> > >On Thu, 2003-12-11 at 06:06, Viswanath Bandi wrote:
> > >  
> > >
> > >>Sorry for not mentioning this in my earlier mail. We have P&E 
> Micro flash
> > >>programmer with us. Can I use it to program the flash? If yes, 
> do I still
> > >>need to mention the flash details in the CDL? Basically I am 
> just trying
> > >>to build it with one serial port so that I can see the RedBoot 
> prompt.> >>
> > >>    
> > >>
> > >
> > >You can indeed use the tool to program the FLASH, but by 
> putting the
> > >details into RedBoot, you'll be able to use the FLASH directly. 
> That
> > >way, you can update RedBoot, save configuration information and 
> other> >data in FLASH, etc.
> > >
> > >In other words, why have a nice big FLASH device (4MB) if 
> you're not
> > >going to use it :-)
> > >
> > >  
> > >
> > >>Gary Thomas wrote:
> > >>
> > >>    
> > >>
> > >>>On Thu, 2003-12-11 at 04:37, Viswanath Bandi wrote:
> > >>> 
> > >>>
> > >>>      
> > >>>
> > >>>>Hello All,
> > >>>>
> > >>>>I have been trying to port eCos to a custom board based on 
> MPC860. I 
> > >>>>copied the
> > >>>>target mbx in powerpc directory and made the necessary 
> changes. In mbx, 
> > >>>>there is
> > >>>>an option called CYGHWR_HAL_POWERPC_MBX_BOOT_32BIT_FLASH to 
> boot from 
> > >>>>32bit flash.
> > >>>>Our board uses Intel 28F320J5 chip arranged as 2M x 16bit 
> memory. Any 
> > >>>>idea how
> > >>>>I need to reflect in the CDL file?
> > >>>>   
> > >>>>
> > >>>>        
> > >>>>
> > >>>Look at how other target platforms have used this device.  
> You'll end up
> > >>>with a new package in the devs/flash/powerpc directory which 
> has CDL and
> > >>>support files that describe your situation.
> > >>>
> > >>> 
> > >>>
> > >>>      
> > >>>
> > >>>>Also can somebody tell what is the difference between 
> booting from ROM and
> > >>>>booting from FLASH.
> > >>>>   
> > >>>>
> > >>>>        
> > >>>>
> > >>>Nothing (as long as it's NOR FLASH) - just terminology.
> > >>>
> > >>> 
> > >>>
> > >>>      
> > >>>
> -- 
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
> 
> 
> -- 
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> 
> 
> 


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