Date: Wed, 07 Jul 2004 13:44:22 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: jhb@freebsd.org Cc: nate@root.org Subject: Re: cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c Message-ID: <20040707.134422.94554167.imp@bsdimp.com> In-Reply-To: <200407071258.46610.jhb@FreeBSD.org> References: <200407071105.04341.jhb@FreeBSD.org> <40EC27C2.7060509@root.org> <200407071258.46610.jhb@FreeBSD.org>
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In message: <200407071258.46610.jhb@FreeBSD.org>
John Baldwin <jhb@FreeBSD.org> writes:
: On Wednesday 07 July 2004 12:41 pm, Nate Lawson wrote:
: > John Baldwin wrote:
: > > On Sunday 04 July 2004 12:23 pm, Warner Losh wrote:
: > >>imp 2004-07-04 16:23:25 UTC
: > >>
: > >> FreeBSD src repository
: > >>
: > >> Modified files:
: > >> sys/dev/acpica acpi_pcib_acpi.c
: > >> Log:
: > >> Make the default memory range in the top 2GB of ram in the hopes that
: > >> this more accurately reflects what the underlying hardware of most
: > >> acpi machines that don't have children pci busses.
: > >>
: > >> We still need a better way to get this information from acpi/hardware.
: > >
: > > s/better/ and AFAIK ACPI doesn't provide such information. :( Even if
: > > they did it'd probably be as screwed up as the _BBN fiasco.
: >
: > Yeah, ACPI doesn't have it. I'm guessing the hw is the only way to get
: > this info.
:
: And there's no standard way to get it from hw if the hw even supports telling
: you.
I've heard rumors that you just have to know with some hardware. Oh,
this is glorbnitz bridge, it only supports 256MB at the top end or
this is gerblitings bridge, it supports 512MB, etc. Oh, this is
lemmings bridge, you read these registers. It would be ugly :-(
Warner
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