RE: [microblaze-uclinux] VGA controller in Microblaze

["Val Inaki" <IVal@xxxxxxxxxx>]

Hi,

 We are also using the Xilinx TFT IP with a Spartan3A FPGA and
Petalinux/MicroblazeMMU. In our Petalinux distribution there was not any
TFT driver, so we had to add it manually in the kernel tree:

http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/xilinxfb.c

You also need to activate the framebuffer support in order to access de
video memory. After everything is working you can use any graphical
library, in our case we have started working with the supplied version
of microwindows in the Petalinux distribution.

Remember that the Xilinx TFT IP is for a hardcoded 640x480 resolution,
but clocking the IP to 25MHz, you can connect a LCD display through the
VGA connector.

I hope this information would be helpful.

Regards,

 Inaki

-----Mensaje original-----
De: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] En nombre de
pcolodron@xxxxxxxx
Enviado el: lunes, 19 de enero de 2009 9:57
Para: microblaze-uclinux@xxxxxxxxxxxxxx
Asunto: Re: [microblaze-uclinux] VGA controller in Microblaze

Hi John,

Thanks a lot for your answer. I am using the XPS TFT ip core (which is  
available in IP Catalog -> IO Modules, in EDK 10.1).

I will take a look to the framebuffer drivers that you told me.  
Anyway, I think I will have to activate the 'framebuffer support' in  
the Petalinux configuration, is that right?

In addition to this, I will try to figure out which is the most  
suitable graphics engine for my system because I am using fbcon and I  
don't know if it is very common in embedded systems.

I could find this framebuffer in the directory  
/linux-2.6.x/drivers/video/console/fbcon.c. However, when I create the  
petalinux kernel and I explore the directory /romfs/dev/, it seems  
that the only frammebuffers that I have are '@console,c,5,1' and  
'@fb0,c,29,0' (is the fbcon framebuffer really activated?). I have not  
tested it yet, but, before doing this, it would be great to know if my  
kernel is properly configured.

Thank you very much for your help John.

Kind regards

> Hi Pablo,
>
> On Fri, Jan 9, 2009 at 8:22 PM, <pcolodron@xxxxxxxx> wrote:
>
>
>    I am actually trying to work with the latest version of Petalinux  
> in my >Xilinx Spartan3 development kit. I am quite unexperienced in  
> this sense but I >have already solved some problems concerning EDK  
> and building the Petalinux >kernel.
>
>    What I would like to do now is to develop a graphical user  
> interface in >Petalinux (to do this, I will use a graphic library  
> called MiniGUI). This >software is basically a C-written program  
> which shows the GUI by means of the >framebuffer fbcon. However, I  
> have some doubts about how to do it.
>
>    My problems are related to the EDK project. I don't really know  
> if >Petalinux will work with any type of VGA IP Core. I mean, will  
> petalinux >detect that I have a VGA IP core? That will be enough if  
> I want to use a LCD >or a monitor? Because of my lack of knowledge  
> in this sense I don't really get >to understand how to do this.
>
>    Please if you know any place where some cores are avaliable (or  
> some >information about how to build a VGA controller which works in  
> Petalinux) it >would be nice of you to tell me.
>
>
> You will require a framebuffer device driver - they are quite simple  
> to write, >with many examples in linux-2.6.x/drivers/video
>
> Which VGA IP core are you using?
>
> Regards,
>
> John



___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive :
http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/