[U-Boot] OMAP3, RFBI, splash screen
Hi, all!
I'm trying to implement splash screen on OMAP35xx-based device with 128x128 1bpp display connected using RFBI, plain parallel interface. Display has controller and own memory, and is controlled with parallel interface, 8-bit wide data bus and signals.
This display works under Linux, but I can't implement that using u-boot, display just doesn't power on, while I see that data is on bus with oscilloscope. Linux version works using interrupts, so I can't do this with u-boot, and that'd be simply overkill using this in u-boot. I think I miss something simple.
Have anybody implemented such a thing, I just need to make it into dumb parallel mode, just to display simple image. Any examples, ideas?
All the best, S.
Sergey Lapin wrote:
Hi, all!
I'm trying to implement splash screen on OMAP35xx-based device with 128x128 1bpp display connected using RFBI, plain parallel interface. Display has controller and own memory, and is controlled with parallel interface, 8-bit wide data bus and signals.
This display works under Linux, but I can't implement that using u-boot, display just doesn't power on, while I see that data is on bus with oscilloscope. Linux version works using interrupts, so I can't do this with u-boot, and that'd be simply overkill using this in u-boot. I think I miss something simple.
Have anybody implemented such a thing, I just need to make it into dumb parallel mode, just to display simple image. Any examples, ideas?
Most probably it won't help you, as it seems you have some HW configuration issues. But for OMAP3 splash screen example see
http://groups.google.com/group/beagleboard/browse_thread/thread/3ad9b803a341...
Best regards
Dirk
Try2: to list.. On Fri, Sep 18, 2009 at 11:08 AM, Dirk Behme dirk.behme@googlemail.com wrote:
Sergey Lapin wrote:
Hi, all!
I'm trying to implement splash screen on OMAP35xx-based device with 128x128 1bpp display connected using RFBI, plain parallel interface. Display has controller and own memory, and is controlled with parallel interface, 8-bit wide data bus and signals.
This display works under Linux, but I can't implement that using u-boot, display just doesn't power on, while I see that data is on bus with oscilloscope. Linux version works using interrupts, so I can't do this with u-boot, and that'd be simply overkill using this in u-boot. I think I miss something simple.
Have anybody implemented such a thing, I just need to make it into dumb parallel mode, just to display simple image. Any examples, ideas?
Most probably it won't help you, as it seems you have some HW configuration issues. But for OMAP3 splash screen example see
http://groups.google.com/group/beagleboard/browse_thread/thread/3ad9b803a341...
Just FYI -> RFBI is pretty easy to configure up.. I dont recollect seeing (Display Sub System) DSS support in mainline u-boot though.. Usually for RFBI display, there is a few configuration sequences you need to do using RFBI CMD reg and is very display specific, followed by filling up the screen with the data you need -> also note for backlight, based on the board, you may need to look at the schematics for required gpio line to toggle to the right position.. you can usually reverse engineer it from the corresponding linux driver for the same.. if you have it.. also ensure you have the pin mux done correctly..
Regards, Nishanth Menon
participants (3)
-
Dirk Behme -
Nishanth Menon -
Sergey Lapin