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12748 Discussions

frame buffer

Altera_Forum
Honored Contributor II
‎04-04-2007 06:51 PM
1,225 Views

Hello hippo and all NiosII users! 

I compiled uClinux-dist with frame buffer (as wrote on nioswiki) and loaded it in my custom board(flash,sdram,vga_controller,uart,eth). Linux is loaded(I see it in Shell) but screen is empty, there is no signal to LCD(without Linux lcd operates correct). 

Need I some adjustments or changes in frame buffer driver if I use my custom board? Where is stored initialization data for VGA_controller (base address). 

Thanks a lot!
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Altera_Forum
Honored Contributor II
‎04-05-2007 01:37 AM
519 Views

Do you see this message in booting? 

fb0: Altera frame buffer device, using 600K of video memory 

 

The framebuffer driver is, 

linux-2.6.x/arch/nios2nommu/drivers/altfb.c 

You may look at altfb_probe(), which init the hardware. 

 

You may need to use scope or signal-tap to check the output pins of the vga controller, HS,VS, etc. 

 

You may need to modify the vga component to meet your LCD timing.
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