Re: [hatari-devel] _FRB cookie in Falcon emulation

[Thomas Huth <th.huth@xxxxxxxxx>]

On 01/08/2025 09.22, Uwe Seimet wrote:
> Hi,
>
> I just noticed this recent commit:
>
> * 842d0d63 - Install a _FRB cookie when using TT RAM in Falcon mode (4 days ago) <Thomas Huth>
>
> As far as I can tell this commit changes the handling of the _FRB cookie when
> running an unmodified version of TOS 4.04. This would have a very negative
> effect on some hard disk drivers, which base decisions on how to deal with
> transfers to alternate RAM on this cookie.
> Therefore I would like to request to revert this change.

The cookie only gets installed when using TT RAM in Falcon mode. This is not 
a configuration that is possible with a real stock Falcon, since that only 
support memory up to 14 MB. The only way you could get something similar is 
likely a CPU accelerator like the MightySonic, and I assume those install a 
_FRB cookie, too. Otherwise your floppy disk access just cannot work in such 
environments.
If you don't want to have a _FRB cookie, you should not use TT RAM in Falcon 
mode.

 Thomas