Re: framebuffer for au1000 based board.

[Maxim Moroz <maxim@kde.ru>]

Dan Malek пишет:

>
> On Sep 2, 2005, at 10:31 PM, Maxim Moroz wrote:
>
>> Hello, I'm writing framebuffer (800x600@16bpp) for au1000 based board 
>> for latest linux-2.6.13 mips kernel.
>> video memory is located at address 0xbe00_0000.
>> The problem is that I cannot correctly mmap video memory to userspace.
>
>
> What happens if you just use /dev/mem and that address?
>
>> mmap was taken from au1500 lcd framebuffer driver(code follows)
>
>
> Bad choice. Neither the Au1000 nor the Au1500 have internal frame
> buffers, so in both cases these are going to be board specific devices.
> Since the Au1500 has a PCI bridge, I suspect that driver is designed
> to work with the 36-bit address from the Au1500 core. You are going
> to have to write a custom mmap() function that does the proper mapping
> for your board design. Also, the Au1000 had some challenging bus
> interface issues to things like graphics controllers and you have to
> choose the proper memory controller configuration and hardware
> design to even have a chance at this working.
>
> Good Luck, you may have lots of work ahead of you very specific
> to your board design :-)
>
>
> -- Dan

The choice is not bad. au1000 also has 36 bit addresses.
I was toooooo bad using address 0xbe00_0000.
changed to 0x1e00_0000 and got working video.
Thanks all who made such perfect port to au1x00 processors!
Really pleased to work with them... Heh.. Tried blackfin some time ago.
that was horrible :-D

He-he, board is almost working already.

Best Regards,
Maxim Moroz.