Re: [microblaze-uclinux] plb tft lcd controller

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Leo,

leo han wrote:

> If I attach DDR to the opb bus, can I use tft_cntrl to read data from
> the DDR memory with plb2opb bridge? Thanks.

It's definitely worth trying, just watch your address map and bus bridge
address windows to make sure everything can "see" the necessary memories.

If the bridge+opb combo can't supply the tft with sufficient memory
bandwidth you may get display corruption.  You may want to look for
options like "burst support" and enable them on the bridge.

Let us know if it works, the DDR on PLB is not ideal for microblaze
systems.  Much better to use an mch_opb_ddr and have the tft pull via a
bridge.

John


> 
> 
> 
> 
>> From: Paul Hartke <phartke@xxxxxxxxxxxx>
>> Reply-To: microblaze-uclinux@xxxxxxxxxxxxxx
>> To: microblaze-uclinux@xxxxxxxxxxxxxx, leo han <wenwenti@xxxxxxxxxxx>
>> CC: microblaze-uclinux@xxxxxxxxxxxxxx
>> Subject: Re: [microblaze-uclinux] plb tft lcd controller
>> Date: Tue, 21 Feb 2006 19:46:35 -0800
>>
>> DCR is used to as the control port for the plb_tft core.  If you need to
>> modify any of the control registers from their defaults--such as the
>> framebuffer base address--then you need to hook this up to the processor.
>>
>> Same as your PPC based design.
>>
>> Paul
>>
>> Quoting leo han <wenwenti@xxxxxxxxxxx>:
>> > Hi Paul,
>> >
>> > I am not sure I understand what you said. So you mean we should have
>> the
>> > DDR
>> > connected to plb bus. And the tft reads data from DDR through plb bus,
>> > while
>> > the MicroBlaze reads/write data from/to memory through opb2plb
>> bridge. Is
>> > that right?
>> > Our current solution is DDR on opb bus. The tft reads the DDR through
>> > plb2opb bridge.   And we do not have the opb2dcr bridge.
>> >
>> > Thanks.
>> >
>> >
>> > >From: "leo han" <wenwenti@xxxxxxxxxxx>
>> > >Reply-To: microblaze-uclinux@xxxxxxxxxxxxxx
>> > >To: microblaze-uclinux@xxxxxxxxxxxxxx
>> > >Subject: Re: [microblaze-uclinux] plb tft lcd controller
>> > >Date: Mon, 20 Feb 2006 20:44:48 -0800
>> > >
>> > >Yes. I am using the microblaze with tft. It has the opb2plb bridge.
>> But
>> > I
>> > >don't instatiate the opb2dcr bridge. Actually, this tft works well
>> if I
>> > use
>> > >powerpc. I will try the opb2dcr bridge. Thanks.
>> > >
>> > >>From: Paul Hartke <phartke@xxxxxxxxxxxx>
>> > >>Reply-To: microblaze-uclinux@xxxxxxxxxxxxxx
>> > >>To: microblaze-uclinux@xxxxxxxxxxxxxx, leo han <wenwenti@xxxxxxxxxxx>
>> > >>CC: microblaze-uclinux@xxxxxxxxxxxxxx
>> > >>Subject: Re: [microblaze-uclinux] plb tft lcd controller
>> > >>Date: Sat, 18 Feb 2006 08:01:11 -0800
>> > >>
>> > >>Did you associate the tft_ref driver with the hardware
>> > plb_tft_cntrl_ref
>> > >>pcore?  Otherwise EDK won't know to compile the software drivers for
>> > the
>> > >>pcore.
>> > >>
>> > >>Also, I assume you are using Microblaze.  If that is the case, you
>> need
>> > >>the
>> > >>opb2plb bridge to connect the plb_tft_cntrl_ref to Microblaze.  Also,
>> > >>you'll need an opb2dcr bridge for the control port as well.
>> > >>
>> > >>Paul
>> > >>
>> > >>Quoting leo han <wenwenti@xxxxxxxxxxx>:
>> > >> > I had a problem with the tft controller. I instantiated an
>> instance
>> > of
>> > >> > the
>> > >> > controller in BSB. It includes the IP in mhs. However, I can not
>> > >>compile
>> > >> > the
>> > >> > software I downloaded from xilinx. It seems that the generated
>> > >> > xparameters.h
>> > >> > file dose not define the macros for tft.
>> > >> > Could anybody point me to any information about the tft?
>> > >> > BTW, I am using EDK7.1 and XUP board.
>> > >> >
>> > >> > Thanks.
>> > >> >
>>
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-- 
Dr John Williams, Research Fellow,
Embedded Systems Group / Reconfigurable Computing
School of ITEE, The University of Queensland, Brisbane, Australia
(p) +61 7 33652185  (f) +61 7 33654999 (m) +61 403969243
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