Date: Thu, 13 Dec 2012 09:46:23 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: emulation@freebsd.org, nox@freebsd.org, current@freebsd.org Subject: Re: new pc-bios/bios.bin breaks freebsd booting Message-ID: <CAJ-VmomAj0fUh3eyHu9zNqVrrR_K62_dz3iHckWxrHGpgpYv7Q@mail.gmail.com> In-Reply-To: <20121213162949.GA23250@onelab2.iet.unipi.it> References: <CA%2BhQ2%2BjvR830=1qiXbzJih4RtZTrSWUyGgXiV8k7XHic%2BQbC4g@mail.gmail.com> <CA%2BhQ2%2Bj4AkN8_AxN1bZztTcWtY9Wn8CD5J0xom-Rbw%2BPzpHjyQ@mail.gmail.com> <CAJ-Vmo==ShYd%2B8Un_nfBpN8ieoVrtN7ZJgZ-kMUg4hiqCJ_xww@mail.gmail.com> <20121213162949.GA23250@onelab2.iet.unipi.it>
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Oh, phew. :) adrian On 13 December 2012 08:29, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > On Wed, Dec 12, 2012 at 09:01:01AM -0800, Adrian Chadd wrote: >> Yes, the qemu bios people decided that they could change the ACPI >> setup, in order to make Linux boot slightly (1 line) quieter. >> >> http://git.qemu.org/?p=seabios.git;a=commit;h=4540409d19a4baeec5006d925cfca19f8038a96e > > the qemu folks are actually being very responsive in trying to fix > this for FreeBSD. See > > http://lists.nongnu.org/archive/html/qemu-devel/2012-12/msg01703.html > > and also the message below > > cheers > luigi > > ----- Forwarded message from Paolo Bonzini <pbonzini@redhat.com> ----- > > Date: Thu, 13 Dec 2012 14:38:45 +0100 > From: Paolo Bonzini <pbonzini@redhat.com> > Subject: Re: [SeaBIOS] [PATCH] acpi: reintroduce LNKS > To: Laszlo Ersek <lersek@redhat.com> > CC: seabios@seabios.org, rizzo@iet.unipi.it, > Marcelo Tosatti <mtosatti@redhat.com> > > Il 13/12/2012 14:33, Laszlo Ersek ha scritto: >>> > Unfortunately, the code after the patch is also against the spec, and it >>> > breaks FreeBSD because it treats IRQ 9 polarity as active low without >>> > the Interrupt() entry. Actually, numeric _PRT entries are handled the >>> > same in Linux and FreeBSD (as active-low). However, under Linux it just >>> > happens to trigger another special casing of SCI which sets SCI up from >>> > its override entry in the MADT, ignoring the DSDT completely. >> I won't pretend I understand what I'm talking about, but the ACPI spec >> 5.0 says in "5.2.12.5 Interrupt Source Override Structure", >> >> Interrupt Source Overrides are also necessary when an identity >> mapped interrupt input has a non-standard polarity. >> >> Hence "necessary but not sufficient", is that it? > > The MADT is about 8259 pins, while the _PRT entry identifies a GSI. So > we have the same GSI (9) specified twice. Linux ignores the settings of > the second entry and reuses those that came from the GSI. The important > bit here is this: > > /* Don't set up the ACPI SCI because it's already set up */ > if (acpi_gbl_FADT.sci_interrupt == gsi) > return gsi; > > (And as you can see it's wrong, sci_interrupt is an 8259 interrupt not a > GSI). > >> SCI_INT in the FADT is explained as >> >> [...] OSPM is required to treat the ACPI SCI interrupt as a >> sharable, level, active low interrupt. >> >> which is then overridden in the MADT, stating active-high polarity. > > Yes, but this doesn't affect the definition of this GSI in the _PRT. It > is always level/active-low for a numeric entry. Among the two > conflicting choices, Linux happens to favor the MADT. FreeBSD doesn't. > > Paolo > > ----- End forwarded message ----- > >> >> >> >> Adrian >> >> On 12 December 2012 08:07, Luigi Rizzo <rizzo@iet.unipi.it> wrote: >> > it seems that qemu-1.3.0 is broken for freebsd... >> > >> > cheers >> > luigi >> > >> > ---------- Forwarded message ---------- >> > From: Luigi Rizzo <rizzo@iet.unipi.it> >> > Date: Wed, Dec 12, 2012 at 8:04 AM >> > Subject: new pc-bios/bios.bin breaks freebsd booting >> > To: qemu-devel@nongnu.org, kraxel@redhat.com >> > >> > >> > I am not sure if it has been reported already but this commit >> > >> > http://git.qemu.org/?p=qemu.git;a=commitdiff;h=d7a51dbbaa70677846453f8c961590913052dd86 >> > >> > (replacing pc-bios/bios.bin with a newer version) >> > breaks booting of FreeBSD on recent qemu (starting roughly with qemu- >> > 1.3.0-rc2). >> > >> > Using a FreeBSD host, and a FreeBSD guest, >> > the qemu thread runs at 100% and the console is stuck >> > after the 'pci0' probe: >> > >> > >> > ... >> > hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0 >> > >> > Timecounter "HPET" frequency 100000000 Hz quality 950 >> > >> > Timecounter "ACPI-fast" frequency 3579545 Hz quality 900 >> > >> > acpi_timer0: <24-bit timer at 3.579545MHz> port 0xb008-0xb00b on acpi0 >> > >> > pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0 >> > >> > pci0: <ACPI PCI bus> on pcib0 >> > >> > Reverting the bios fixes things. >> > I wonder if it isn't the case of reverting this change ? >> > >> > cheers >> > luigi >> > >> > >> > >> > -- >> > -----------------------------------------+------------------------------- >> > Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. dell'Informazione >> > http://www.iet.unipi.it/~luigi/ . Universita` di Pisa >> > TEL +39-050-2211611 . via Diotisalvi 2 >> > Mobile +39-338-6809875 . 56122 PISA (Italy) >> > -----------------------------------------+------------------------------- >> > >> > >> > >> > >> > -- >> > -----------------------------------------+------------------------------- >> > Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. dell'Informazione >> > http://www.iet.unipi.it/~luigi/ . Universita` di Pisa >> > TEL +39-050-2211611 . via Diotisalvi 2 >> > Mobile +39-338-6809875 . 56122 PISA (Italy) >> > -----------------------------------------+------------------------------- >> > _______________________________________________ >> > freebsd-current@freebsd.org mailing list >> > http://lists.freebsd.org/mailman/listinfo/freebsd-current >> > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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