Date: Wed, 6 Apr 2011 16:00:53 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-acpi@freebsd.org Cc: =?utf-8?b?0JrRgdC10L3Qt9C+0LIg0JDQu9C10LrRgdC10Lk=?= <aksenzov@gmail.com> Subject: Re: Atheros 9285 & Atheros AR8131 Message-ID: <201104061600.53572.jhb@freebsd.org> In-Reply-To: <201103281406.27334.jhb@freebsd.org> References: <AANLkTi=-rourdUbyH0MVceHi81vAHcNdpaxjpmxJ_BCk@mail.gmail.com> <AANLkTinPAF6dQ0Y4se2B7yqQxVBktv3X1_MUFkfb75dC@mail.gmail.com> <201103281406.27334.jhb@freebsd.org>
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On Monday, March 28, 2011 2:06:27 pm John Baldwin wrote: > On Monday, March 28, 2011 12:46:02 pm =D0=9A=D1=81=D0=B5=D0=BD=D0=B7=D0= =BE=D0=B2 =D0=90=D0=BB=D0=B5=D0=BA=D1=81=D0=B5=D0=B9 wrote: > > 2011/3/29 Sergio de Almeida Lenzi <lenzi.sergio@gmail.com> > >=20 > > > > > > This is probably due to a problem FreeBSD has with ACPI initializati= on > > > sometimes wiping out the state in PCI-PCI bridges for resource window= s and not > > > gracefully recovering from that. I have some early work in progress = to > > > address this, but it will be a while before I have something ready for > > > testing. > > > > > > > > > it is the acer bios that is does not follow acpi standard... I have = the > > > same problem > > > in an old acer 5050 no solution still... I had to install linux in = that > > > notebook. > > > > > > My advice is not to buy acer... they are cheap any good... > > > > > > Well let's wait for the Baldwin fix.... > > > > > > > > maybe this can be corrected by editing the ASL? >=20 > We've never figured out what is zeroing the registers in the PCI-PCI brid= ges. > I suspect it is not something in the ASL, but is a side effect of some BI= OS > code that runs in SMM when ACPI is turned on. Ok, so I have a patch to rework how PCI-PCI bridges manage resources for devices. This patch applies to HEAD, no idea if it applies to older branch= es (likely not). You will need to add the option 'NEW_PCIB' to your kernel config after applying this patch. http://www.FreeBSD.org/~jhb/patches/pcib_new.patch =46or my local testing I used a hack to wipe out the PCI-PCI bridges in my test machine similar to what the BIOS does on these machines. The bridges all grew windows to match their original BIOS-assigned windows based on the BIOS-assigned resources in the BARs of the child devices. These patches should also let us allocate new resources from scratch for devices behind PCI-PCI bridges once we have better support for determining = what are valid PCI address ranges in the Host-PCI bridge drivers. =2D-=20 John Baldwin
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