[ECOS] MPC860 Porting (ROM/Flash)

[Viswanath Bandi]

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.

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.


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.
>>>
>>> 
>>>
>>>      
>>>



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