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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Possible bug in CPU emulation?
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Tue, 8 Oct 2019 19:32:46 +0200
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Hi,
Any idea why nobody has ever noticed that before? CBHD was discontinued
more than 22 years ago, and only now it has been found that with ICD
compatible hardware it never worked for XHDI sector counts > 255? That's
rather surprising, but of course not completely impossible.
Do you know whether there is the same issue with Rwabs and sector counts
> 255, or just with XHDI?
Best regards
Uwe
> Thorsten Otto schrieb:
> > On Montag, 7. Oktober 2019 22:20:42 CEST Nicolas Pomarède wrote:
> >> the path to follow is indeed to find why it crashes on real HW,
> >
> > I agree, if it would be the other way around (only crashing on Hatari), it
> > would be much easier to investigate this.
> >
> > If someone wants to look at this, first thing it would do is to add some debug
> > output in mint that prints the basepage after Pexec(), so you know at least
> > which module the PC belongs to.
> >
> > Anyway, just wanted to let you know. I know that it will be a tedious task to
> > look after this, and unfortunately i cannot help with this.
>
> In the meantime, I debugged it. See the details in the original ticket:
> <https://github.com/freemint/freemint/issues/127>.
>
> Short summary:
> - It's a bug in the CBHD driver, trying to transfer more than 255
> sectors in one go.
> - Hatari inadvertently fixes this bug for CBHD because it does limit the
> number of sectors like the ST's DMA would.
>
> Regards
> Christian
> --
> Christian Zietz - CHZ-Soft - czietz@xxxxxxx
> WWW: http://www.chzsoft.de/
> PGP/GnuPG-Key-ID: 0x52CB97F66DA025CA / 0x6DA025CA
>
>