topic Re: Configuring the resolution of the VGA to support 800x600 and 640x480 in i.MX Processors

Configuring the resolution of the VGA to support 800x600 and 640x480

ShishirJha — Fri, 16 Sep 2011 16:07:08 GMT

Hello to all,

I have been working with imx53 board for last few days and am loving it. I have android up and running, but ran into resolution problem. The screen that I want to use the imx53 for is 800x600 or even better if it is 800x480. Present resolution of 1024x768 was good on a monitor but the touch panel that I have now will not accept that resolution. Though I have the task of integrating the touch screen driver in the kernel still ahead of me, I would like to get the resolution right first. I am using the VGA port and not the LVDS output for the touch panel display.

Looking at the Kernel Source it looks like I need to edit the frame buffer definitions in mx53loco.c but I am not sure what values to input there to define a mode for 800x600 and 800x480.

Any help in this matter would be great.

Also, has anyone tried soldering a momentary push button switch on to the Power button to get the Power button out on a case for switching the board on and off. I am skeptical on whether I should do it or not and if it would affect the PMIC in any way.

Regards

Re: Configuring the resolution of the VGA to support 800x600 and 640x480

PhilEndecott — Fri, 16 Sep 2011 23:03:22 GMT

Yes, you need to hack the kernel. No, I don't know the values that you need. Yes, I believe that you should be able to extend the power-on button in the way that you propose without any trouble.

Re: Configuring the resolution of the VGA to support 800x600 and 640x480

LuisCasado — Fri, 16 Sep 2011 23:32:20 GMT

Hello,

800x600x16bpp and 800x600x32bpp are supported in the BSP, see BSP release notes for kernel parameters.

These app notes can help you:

http://www.freescale.com/webapp/search/Serp.jsp?qt=different+display&QueryText=different+display&baseUrl=http%3A%2F%2Fwww.freescale.com%2Fwebapp&PART_NUMBER=&SEARCH_OPERATOR=Contains&attempt=-1

You can check the following application notes:

AN3974 : Different Display Configurations on i.MX35 Linux PDK
AN4182 : Different Display Configurations on the i.MX31 Linux PDK

Re: Configuring the resolution of the VGA to support 800x600 and 640x480

ShishirJha — Mon, 19 Sep 2011 03:51:24 GMT

Thank you Phil and Luis for your help, it guided me to the right path and all that I needed to was change the vga line from VGA-XGA to VGA-SVGA in the uboot to get force it to 800x600. This was defined in tve.c.