Re: [microblaze-uclinux] XUPV2P Board with 512MB DIMM

[reichardt@xxxxxxxxxxxxxxxxxxxx]

Hi Paul,
thanks for your advice to use ISE 8.2.
I now modified the *.MHS and *.UCF to use a 512MB DDR 
(Kingston, bought from Digilent) instead of the 256MB, but now the 
memory test doesn't work !
I finally come to the conclusion that probably none of the Xilinx 
sample designs works with the 512MB version! A Xilinx application 
engineer invested a lot of time (on another, very simple design) to 
find out that the opb_ddr using 512MB DDR has significant timing 
problems. His only solution was the hint to use ISE 8.2 ! 

Regards
Juergen


> Hi Juergen,
> 
> Several comments.  First, as you note, almost all the reference 
designs use
> the 256MB dimm.  Unless there is a specific reason you require 
the larger
> DIMM, the path of least resistance is to use the same 
configuration as
> almost all the reference designs.
> 
> Second, is this one of the 512MB Dimms from Digilent?  If so, 
then using EDK
> 8.2 BaseSystemBuilder and selecting the correct DIMM in the 
wizard should
> work.  This will use the mch_opb_ddr memory controller which 
I've used
> successfully.
> 
> Finally, Yes, you have to recompile the kernel anytime the 
underlying
> hardware changes.  However, this is because the kernel is 
accessing more
> memory not because of the different memory controller.
> 
> Paul
> 
> Quoting reichardt@xxxxxxxxxxxxxxxxxxxx:
> > Hi folks,
> > I just joined the uClinux project and have a XUPV2P board 
available which
> > is
> > equipped with a 512MB DIMM memory.
> > Normally all Xilinx reference designs use the 256MB DIMM 
modules. Also
> > the
> > download project from the xilinx homepage uses 256MB DDR.
> >
> > With other design implementations I had to learn that the 
512MB opb_ddr
> > interface
> > has significant timing problems if I use ISE 7.1i. I was told that 
those
> > problems are
> > solved by using ISE 8.1 or 2.
> >
> > So my questions:
> > - Did anyone use the XUPV2P with 512MB DDR
> > - Do you use ISE7.1 or ISE8.x
> > - If you use the 512MB DDR, did you have to recompile the 
image.bin
> > because the
> > opb_ddr IP names and so the information in the xparameters.h 
are
> > different?
> >
> > Thanks in advance
> >
> > Juergen
> >


--------------------------------------------------------------------------------
Prof. Dr. Jürgen Reichardt,
Studiengangsleiter Mikroelektronische Systeme

Hochschule für Angewandte Wissenschaften
Studiendepartment Informations- und Elektrotechnik
Berliner Tor 7, D-20099 Hamburg, Tel.: +49 40 42875 8443

reichardt@xxxxxxxxxxxxxxxxxxxx
--------------------------------------------------------------------------------


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