[SeaBIOS] Re: [Qemu-devel] Regression with floppy drive controller

[Paolo Bonzini]

On 21/08/19 08:42, Gerd Hoffmann wrote:
> > So we should use '-cpu Conroe' or '-cpu core2duo' minimum?
>
> -cpu Conroe for -M isapc is kida silly though ...
>
> Maybe we should simply build seabios with CONFIG_TSC_TIMER=n ?
>
> Using the TSC in a virtual machine is problematic anyway, the
> calibration can be _way_ off on a loaded host, this is why seabios
> prefers the (fixed frequency) pmtimer.

Yeah, that falls back to the PIT which is a good enough source for
SeasBIOS's needs (1 MHz, one third of the pmtimer).  It overflows a bit
too easily but it shouldn't be a big deal for users of isapc.

Paolo