Xilinx Virtex boot (And MPMC)

[Stephen Neuendorffer]

The MPMC would almost certainly be a better option here...

Steve

> -----Original Message-----
> From: 
> linuxppc-embedded-bounces+stephen=neuendorffer.name at ozlabs.org
>  
> [mailto:linuxppc-embedded-bounces+stephen=neuendorffer.name at oz
labs.org] On Behalf Of Robert Woodworth
> Sent: Thursday, August 30, 2007 7:45 AM
> To: Grant Likely
> Cc: linuxppc-embedded at ozlabs.org
> Subject: Re: Xilinx Virtex boot
> 
> On Wed, 2007-08-29 at 18:29 -0600, Grant Likely wrote:
> > On 8/29/07, Robert Woodworth <rwoodworth at securics.com> wrote:
> > > I'm trying to port Linux to a new Virtex Platform.  The 
> kernel will not
> > > uncompress, I get the following on the console:
> > >
> > > loaded at:     00400000 004FB19C
> > > board data at: 004F9120 004F919C
> > > relocated to:  00404054 004040D0
> > > zimage at:     00404E50 004F8409
> > > avail ram:     004FC000 04000000
> > >
> > > Linux/PPC load: console=ttyUL root=/dev/xsa2
> > > Uncompressing Linux...
> > > zlib_inflateInit2 returned 00506530
> > > exit
> > >
> > > Any ideas what causes this error??
> > > Is something mis-configured on my EDK project?
> > >
> > 
> > Possibly, do you know that EDK has your ram is configured correctly
> > (ie. have you run a memory test application)?
> 
> Yes, I ran the sample memory test application that EDK builds
> automatically.  It ran fine.
> 
> The fact that the above prints on the console, tells me that the
> zImage.elf is getting loaded at the correct start location 
> and that its
> partly executing.
> 
> What is the return code that I'm seeing??  I have been unable 
> to figure
> that out from the source yet.
> 
> 
> > >
> > > I have 64MB DDR on the OPB *not* the PLB.
> > > Is that a problem??
> > 
> > It shouldn't be the problem, but why are you doing that?
> 
> We are building an image-processing application inside the FPGA.  The
> application is very memory intensive.  I have been told that the PPC
> always has priority on the PLB and that if I want to have my 
> FPGA module
> have priority on memory, that I should place the memory and my FPGA
> module on the OPB.  Yes, this can significantly slow down the PPC, but
> in my case the PPC is only used for UI and networking.
> 
> I will actually build in *two* OPBs one for the memory + my module and
> the second for the other peripherals. 
> 
> 
> Woody.
> 
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