[ECOS] MPC860 Porting (ROM/Flash)

Gary Thomas gary@mlbassoc.com
Thu Dec 11 20:59:00 GMT 2003


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.

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 than
blowing ROM/FLASH images all the time.

> 
> 
> 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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