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

[Gerd Hoffmann]

  Hi,

> Using the default QEMU config, we build SeaBIOS to use the TSC timer:
> 
> builds/seabios-128k/.config:CONFIG_TSC_TIMER=y
> builds/seabios-256k/.config:CONFIG_TSC_TIMER=y

> Do we need a cpu with TSC support to run SeaBIOS?

Hmm.  seabios uses pmtimer if available.  isapc has no pmtimer though,
so it uses TSC instead.

> 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. 

cheers,
  Gerd