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

[Viswanath Bandi <bandiv at txc dot stpn dot soft dot net>]

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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