Other NXP ProductsのトピックIPU Initialization to enable display during the bootloader

IPU Initialization to enable display during the bootloader

jasona — Sat, 25 Oct 2008 02:49:28 GMT

I am new to the iMX family of processors and I need to be able to display some text before the OS image is launched. I have the BSP for platform builder and I am looking through the IPU code tree to help with this process. I would like to know if there is some other example code that I can look? It would be a plus if this code demonstrated the minimum set of registers that need to initialized to get an image displayed on the screen. Any help is appricated.

Thanks,
Jason

Re: IPU Initialization to enable display during the bootloader

fabio_estevam — Thu, 30 Oct 2008 00:07:32 GMT

Jason,

In the MX27/MX31 BSPs an image is displayed during kernel bootup. You can see the detail of the implementation by looking at this patch: http://www.bitshrine.org/gpp/linux-2.6.24-mx-Add-MX27-MX31-and-MX32-splash-screens-to-k.patch

Regards,

Fabio Estevam

Re: IPU Initialization to enable display during the bootloader

jasona — Fri, 31 Oct 2008 19:22:21 GMT

Fabio,
Thanks for the response. I am looking how I can do this same thing in the boot loader before the boot loader launches the OS. Can you point me into a code sample direction that will allow me to do this in the boot loader?

Thanks,
Jason

Re: IPU Initialization to enable display during the bootloader

fabio_estevam — Fri, 31 Oct 2008 20:02:24 GMT

Jason,

Basically what you need to do in your bootloader is to initiliaze the LCD controller and then you can load your image in the framebuffer memory.

As a reference you can use the concept done on the MX27: http://www.emgware.com/low_cost_imx_tools/

(Look at Video5 and iMX27 Scripts)

This is initiliazation is done via JTAG, but you could add it to your bootloader code.

Regards,

Fabio Estevam

Re: IPU Initialization to enable display during the bootloader

jasona — Thu, 13 Nov 2008 21:59:40 GMT

Fabio,
Thanks for the link it got me closer. Unfortunately, I am still not able to get an image or just text to display in my boot loader. I have gone over the IPU documentation and looked at the WinCE driver initialization. I am thinking that there must be a control register that I have not gotten initialized properly but I cannot seem to find it. Any suggestions would be appricated.

Regards,
Jason