Re: Re: u-boot & uImage on M5282LITE

Hi Allon,

> How to attach to the FPGA? Where is it in memory? Where do you want  
> it? Which chip select does it use?
> Ever done this sort of thing before?
> 
> Each memory-mapped device on the bus shares the same address/data  
> lines. Not all of the address lines go through - this saves on lots  
> of lines that would otherwise be ignored in 99% of uses. Instead, the  
> CPU asserts a chip-select line whenever you are accessing the memory  
> range occupied by the device. Some devices have programmable chip- 
> selects, others, you have to use the memory range tied to a specific  
> chip select. This chip select then goes to the address decode logic  
> of the device on the bus, to let it know when it is being accessed.
> 
> Looks like you're using CS1, at least in the example above.
> 
> Chapter 12 of the MCF5282 manual describes the chip select registers  
> (I'm referring to MCF5282UM Rev 2.3)
> 
> The CF allows you to set the base address and size of a device on a  
> chip-select.
> 
> when you initialize your driver, 

I am trying to do this when i initialize the driver and when I read
back the CSXX memory addresses they all look ok:

fpga:Running al test
fpga:CSAR5: (400000bc) 0     <--- Where is base address?
fpga:CSMR5: (400000c0) 10001
fpga:CSCR5: (400000c4) 3d00
fpga:CSAR6: (400000c8) 0     <--- Where is base address?
fpga:CSMR6: (400000cc) 10001
fpga:CSCR6: (400000d0) 3d00


except CSAR. in other words what I set them to is printed back to me
except CSAR any thoughts? Should I really be doing this in the boot
loader (u-boot)?  Am I missing something? The code is attached.



Alex
-- 
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Loren A. Linden Levy
Department of Physics 
390 UCB 
University of Colorado
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