Re: [avr-libc-dev] AT43USB35x support!

[Marek Michalkiewicz]

On Fri, Feb 28, 2003 at 03:36:39PM -0800, Keith Gudger wrote:
> The 320 supports 16 address lines for *words* of external Program Memory.
> The PC is 16 bits wide.  There is NO RAMPZ register.  SO, I guess what
> this means is that one could have up to 64K of program code, but LPMs
> would only be able to get to the bottom 32K?  I don't think any of us here
> looked at this in detail - We've never put more than a 16K *byte* FLash on
> the thing.  

OK, so for the 320 we can only support up to 64K bytes (32K*16) of
program memory - GCC puts initialized data above program code, and
the startup code for devices with >64K of program memory has to use
RAMPZ and ELPM instruction in the loop that copies the data to RAM.

So, FLASHEND in io43u32x.h is defined as 0xffff (64K bytes) now.
BTW, this is a byte address - I've fixed io43u35x.h to define
FLASHEND as 0x5fff (24K bytes) instead of 0x2fff.

64K bytes of program memory is still plenty anyway :)

Marek