From: Kevin O'Connor <kevin@koconnor.net>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Alex <coderain@sdf.org>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
seabios@seabios.org, "QEMU Developers" <qemu-devel@nongnu.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"John Snow" <jsnow@redhat.com>
Subject: Re: [Qemu-devel] [SeaBIOS] Re: Regression with floppy drive controller
Date: Wed, 21 Aug 2019 09:31:48 -0400 [thread overview]
Message-ID: <20190821133148.GA20226@morn.lan> (raw)
In-Reply-To: <20190821064208.eckikvttpdc3zjmd@sirius.home.kraxel.org>
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
next prev parent reply other threads:[~2019-08-21 13:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 10:25 [Qemu-devel] Regression with floppy drive controller Philippe Mathieu-Daudé
2019-08-20 13:12 ` John Snow
2019-08-20 13:38 ` Philippe Mathieu-Daudé
2019-08-20 14:00 ` Philippe Mathieu-Daudé
2019-08-20 14:36 ` [Qemu-devel] [SeaBIOS] " Dr. David Alan Gilbert
2019-08-20 14:54 ` Philippe Mathieu-Daudé
2019-08-20 15:02 ` Philippe Mathieu-Daudé
2019-08-20 15:04 ` Dr. David Alan Gilbert
2019-08-20 16:21 ` [Qemu-devel] " Philippe Mathieu-Daudé
2019-08-20 20:37 ` Eduardo Habkost
2019-08-21 6:42 ` Gerd Hoffmann
2019-08-21 7:45 ` Paolo Bonzini
2019-08-21 13:31 ` Kevin O'Connor [this message]
2019-08-22 8:32 ` [Qemu-devel] [SeaBIOS] " Gerd Hoffmann
2019-08-22 8:42 ` Gerd Hoffmann
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