[xorg-bugzilla-noise] [Bug 1183] New: IA64: HP ZX1/2 support currently disabled

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1183        
   
           Summary: IA64: HP ZX1/2 support currently disabled
           Product: xorg
           Version: 6.8.0
          Platform: HP
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DDX/xorg
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: eich at pdx.freedesktop.org


The special support for HP IA64 ZX1/ZX2 PCI buses is currently disabled as the
PCI bridge range detection code assumes that if non of the other well known
chipsets is found a ZX1 chipset is present and pokes around some addresses which
can bring other not detected systems to a grinding halt.
Since ZX1/ZX2 systems can only be probed thru ACPI there is no generic way to
probe them (unless one seriously considers to add ACPI code to X which should
live in the kernel). Instead it is necessary to probe for this chipset using an
OS dependent method. The IA64 PCI code originally from XFree86 did not support
this (unlike the AXP PCI code). 
The patch that's going to be appended below adds this support (it works
similarly as the AXP code) and reenables PCI bridge support for these chipsets.
In the long run a lot of this code should disappear into the kernel. However I
assume that we will still need this code for platforms that don't have the
required kernel support.        
   
   
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