implementing vga16fb

DISCUSSION Suresh Chandra Mannava 2 participants 2 messages Mar 23, 2004 Framebuffer layer

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Suresh Chandra Mannava

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2004-03-23 05:25 UTC #0 lore raw

Dear Friends,

I am a new to framebuffer, we are implementing kernel framebuffer support for the new CPU architecture. I have some basic questions related to vga16fb. Please provide some inputs and drive us for successful implementation of framebuffer.

Even though we are having PCI ATI Rage XL graphic card, we are interested in implementing generic vga16fb for an initial test.

Here are my few queries,

I read that VESAfb is only for Intel(x86) platforms, has any body implemented Vesafb on other platforms?

Is vga16fb a CPU architecture dependent? Even though I didn't find any architecture dependent sections in the code, Is there any code section that to be modified in vga16fb.c?

What are the corresponding files need to be modified for implementing framebuffer support for newer platforms.

And lastly, we are testing this framebuffer on 2.6Mhz FPGA(0.16 Bogomips) with kernel 2.4.7. Are there any other methods (solutions) for debugging framebuffer code with out using printk's?

I request your help.

Regards,

Suresh Chandra Mannava.

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Geert Uytterhoeven

2004-03-23 09:47 UTC #1 lore raw

Quoted 2 lines · Suresh Chandra Mannava

I read that VESAfb is only for Intel(x86) platforms, has any body implemented Vesafb on other platforms?

Vesafb relies on the BIOS setting up the video mode _before_ the kernel is started.

Quoted 3 lines

Is vga16fb a CPU architecture dependent? Even though I didn't find any architecture dependent sections in the code, Is there any code section that to be modified in vga16fb.c?

I used vga16fb on PPC a while ago. Make sure the video RAM address in ISA memory space is correct.

Quoted 3 lines

And lastly, we are testing this framebuffer on 2.6Mhz FPGA(0.16 Bogomips) with kernel 2.4.7. Are there any other methods (solutions) for debugging framebuffer code with out using printk's?

I assume you mean `printk() on the frame buffer'.
printk() on a serial port?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that.
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