Re: [hatari-devel] Videl / VBL interrupt issue in Hatari?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 20/01/2014 12:55, Mariusz Buras a écrit :
> Hi,
> Perhaps it happens because Hatari is usually slower then real Falcon?

Hi,

I don't think so, timings are sometimes different, but overall speed 
should be rather similar ; it could be a pending interrupt mask that is 
not correctly clear when several VBL interrupts occur and SR>2300.

Best to test/debug this would be to have a very small program that just 
does the VBL interrupt and reproduce the problem (having to run BM is 
involving too many things to clearly separate issues).

Nicolas

> --
> Cheers,
> Mariusz Buras.
> ---
> http://sqward.net
> http://www.linkedin.com/in/mariuszburas
>
>
> On 20 January 2014 11:51, Eero Tamminen <oak@xxxxxxxxxxxxxx
> <mailto:oak@xxxxxxxxxxxxxx>> wrote:
>
>     Hi,
>
>     Douglas is having strange Videl & VBL issue. VBL interrupt
>     handler starts recursing until its stack usage stomps over
>     something important:
>     http://www.atari-
>     forum.com/viewtopic.php?f=68&t=24561&sid=b0e47373736e3702af60c1dec3dd20e8&start=1400
>     <http://forum.com/viewtopic.php?f=68&t=24561&sid=b0e47373736e3702af60c1dec3dd20e8&start=1400>
>
>     This doesn't occur on real Falcon (has never happened there,
>     can be reproduced 100% in Hatari).
>
>     "It does stop if I don't lower interrupt priority mask in the VBL.
>     It's very
>     strange that the VBL can recurse on top of itself without a loop
>     present, or
>     any jumps. I might even say its borderline not-possible."
>
>     Any ideas what could cause this with WinUAE CPU core?
>
>
>              - Eero