Re: kern/50453

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

The following reply was made to PR kern/50453; it has been noted by GNATS.

From: Patrick Welche <prlw1%cam.ac.uk@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/50453
Date: Fri, 29 Jan 2016 11:46:20 +0000

 With NO_PCI_EXTENDED_CONFIG:
 
 agp0 at pchb0: i915-family chipset
 agp0: AGP_I915_IFPADDR = e0000001 (100000,ffffffff)
 agp0: detected 7932k stolen memory
 agp0: BAR size 100000 mismatches detected GTT size 40000; trusting BAR
 agp0: aperture at 0xd0000000, size 0x10000000
 
 Without NO_PCI_EXTENDED_CONFIG:
 
 acpi0: acpimcfg_map_bus done
 ...
 agp0 at pchb0: i915-family chipset
 agp0: AGP_I915_IFPADDR = e0000001 (100000,ffffffff)
 agp0: Try bus_space map again
 agp0: bus_space map returned error = 35 (addr = e0000001)
 agp0: can't set up chipset flush page: 35
 
 From sys/arch/x86/pci/pci_machdep.c
 
 #if NACPICA > 0 && !defined(NO_PCI_EXTENDED_CONFIG)
         acpimcfg_map_bus(self, pba->pba_pc, pba->pba_bus); 
 #endif
 
 the call to acpimcfg_map_bus causes the outcome to be different
 even though the same address was read.
 
 Note that in both cases we see:
 
 MCFG: bus 0-255, address 0x00000000e0000000: no valid region
 ...
 acpi0: MCFG: PNP0C01: Type=7
 acpi0: MCFG: PNP0C01: bus 0-255, address 0x00000000e0000000: no valid region
 ...
 acpi0: MCFG: PNP0C02: Type=7
 acpi0: MCFG: PNP0C02: bus 0-255, address 0x00000000e0000000: no valid region
 ...
 acpi0: MCFG: PNP0C02: Type=7
 acpi0: MCFG: PNP0C02: bus 0-255, address 0x00000000e0000000: no valid region
 acpi0: MCFG: PNP0C02: Type=10(FIXED_MEMORY32), Address=0x00000000e0000000, Lengt
 h=0x0000000010000000
 acpi0: MCFG: segment 0, bus 0-255, address 0x00000000e0000000