On Wed, Aug 21, 2019 at 08:42:08AM +0200, Gerd Hoffmann wrote: > 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.
But, SeaBIOS should have automatically detected no TSC and then fallen back to the PIT. And the check does work correctly with "-cpu 486" in my tests. Is the PIT not working for some reason in the original setup? (Any time I attempt to run with "-M isapc" I just get an "Unable to unlock ram - bridge not found" error.) The PIT seems to work okay in my setup. -Kevin
