[En-Nut-Discussion] SAM9260-EK getting started

[steve]

Alain,

  Thanks for the hint, however I can't find any comprehensible documentation
  on this, can you please point me in the right direction.

  How does the compiler/linker know where the internal SRAM blocks are?
  Does it automatically include the code to copy my code to the SRAMs.

  Thanks again.

Steve.

At 17:31 14/07/2008, you wrote:
>search for "ramfunc", I found it in sam7 code. It inicializes a prefix
>that sends a single function to ram. It can be further expanded to use
>both internal ram blocks.
>
>Alain
>PS: I send a message by mistake to the list, I was just checking info
>from some comments (it was in portuguese)
>
>steve escreveu:
> > Hi,
> >
> >   Further to my problems getting the expected performance from the
> >   9260 processor it seems the limiting factor is bus speed to the
> >   external SDRAMs (notwithstanding the lack of clarity over whether
> >   or not the caches are actually doing anything).  Given that the
> >   max bus speed is 100MHz plus the necessary latencies in SDRAM
> >   accesses this results in a best-case net performance NO BETTER
> >   than a 48MHz ARM7!
> >
> >   It would therefore seem that the only hope of achieving any
> >   improvement on this would be if best use could be made of the
> >   8Kbytes internal fast ram.  Does anyone know of any mechanism
> >   to persuade the compiler/linker to place critical bits of code
> >   / data and perhaps the stack in internal SRAM?
> >
> >   Thanks a lot.
> >
> > Cheers,
> > Steve.
> >
> >
> > At 14:01 13/07/2008, you wrote:
> >> steve wrote:
> >>>   If I program the webradio application into dataflash on my 9260-EK,
> >>>   (along with the Atmel bootloader) then it works.  Programming directly
> >>>   into SDRAM @ 0x20000000 it fails.  Clearly there's something in that
> >>>   bootloader that makes all the difference, does this make any sense?
> >> Indeed, there may be a missing initialization in the SAM-BA ROM or the
> >> Webradio, which is provided by the boot loader. Unfortunately I haven't
> >> had the time to test all this here. At least I do have the same board
> >> revision 1.0.
> >>
> >>>   I now have another problem - my LJG JPEG decompression application
> >>>   runs slightly _SLOWER_ on the 9260-EK (CPU clk 90.3MHz) than on my old
> >>>   SAM7X-EK (CPU clock at 48MHz).  I moved to ARM9 specifically to get
> >>>   more speed, does anyone have any idea why?
> >> I had a discussion with Atmel about similar experiences with the MP3
> >> fixed point software decoder used in the webradio. They later changed
> >> the SDRAM initialization (SAM-BA script and bootloader) and performance
> >> increased. It was still slower than expected, but significantly faster
> >> than the SAM7X. In case you are using an old SAM-BA Tool or boot loader...
> >>
> >> Harald
> >>
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> >
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> >
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