Re: bugs!

[Lucas Correia Villa Real <lucasvr@gobolinux.org>]

Hi again,

I've fixed the non-linefetch error: I was passing the virtual framebuffer 
address into fix.smem_start instead of the physical one. Things got weird 
then when fb_writeb() tryied to write on that address ;-)

Cheers,
Lucas


On Friday 14 May 2004 01:30, Lucas Correia Villa Real wrote:
> Hi!
>
> I'm almost finished with my driver for the monochromatic ST7565 LCD, but
> I'm dealing with a bug that I could't solve by the entire day.
>
> It was designed to be run as a module, and it's living together with
> another display that already owns the console devices. So, when I load
> st7565's module, it just skips take_over_console() code in fbmem.c and
> starts to accept write()'s on it.
>
> By the way, I got some demo applications from MicroWindows
> (microwindows.org) that starts to get more information from the driver. It
> looks like when they request st7565_set_cmap(), some invalid pointer is
> accessed and the driver just dies:
>
> Unhandled fault: external abort on non-linefetch (0x00a) at 0x4001a004
> pgd = c3d78000
> *pgd = 0bcaf001, *pmd = 0bcaf001, *pte = c4a5e0b3, *ppte = c4a5eff2
>
> I've looked at other drivers' routines, such as hgafb, and it really looks
> to be everything on the right place. I got the impression that this error
> could be happening due to the fact that my driver didn't get the console's
> ownership, so I've disabled the other driver and compiled st7565 built-in,
> but then the driver dies with the same message at take_over_console().
>
> Does anyone know if hgafb is a working driver that I could rely on? Also I
> got confused by the need to use or not a color pallete -- probably I don't
> need, as I'm working only with black/white, but at this time I'm no more
> sure about anything at all :-)
>
> I'm also confused about the "setcolreg()" function passed to fb_get_cmap().
> What should it do? What's the meaning of its 1st parameter, "regno"?
>
> If someone could take a time to give a quick look on my set_cmap() routine,
> I've uploaded the code here:
>
> http://cscience.org/~lucasvr/etc/st7565.c
>
> Thanks in advance, any help will be very appreciated!
> Lucas
>
>
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