Sorry I forgot to attach the message logs.

Rajat

On 9/2/05, Rajat Jain <rajat.noida.india@gmail.com> wrote:
> Hi,
> 
> I'm using RHEL4 kernel (2.6.9), and am trying to make PCI Express
> Native Hot-plug driver (pciehp) work on my system (My system has two
> hot-pluggable PCI Express slots). I am facing following problem, and
> would really appreciate if any one can provide any info regarding this
> problem.
> 
> When I disable the ACPI support in my kernel configuration, the
> ("non-acpi") pciehp driver inserts successfully and I see the
> following two entries appearing in my /sys/bus/pci/slots:
> 
> drwxr-xr-x  2 root root 0 Sep  2 14:28 10
> drwxr-xr-x  2 root root 0 Sep  2 14:28 11
> 
> However, when I enable the ACPI support in the kernel, the controller
> initialization fails giving me following error (excerpts):
> 
> ......
> ......
> pciehp: pfar:cannot locate acpi bridge of PCI 0xb.
> pciehp: pciehprm_find_available_resources = 0xffffffff
> pciehp: unable to locate PCI configuration resources for hot plug add.
> ......
> ......
> pciehp: pfar:cannot locate acpi bridge of PCI 0xe.
> pciehp: pciehprm_find_available_resources = 0xffffffff
> pciehp: unable to locate PCI configuration resources for hot plug add.
> ......
> ......
> 
> I am attaching both the logs (The one with ACPI enabled and giving
> this error, the other - ACPI disabled and displaying the slot
> entries). I am not sure where the problem lies. But the fact that the
> entries are appearing correctly when I disable ACPI, combined with
> above error messages, I suspect that there is a problem with ACPI
> namespace (probably the resources cannot be found using ACPI).
> 
> I have two questions:
> 
> 1) How can I go about tackling this problem? The possibility of BIOS /
> Hardware being faulty cannot be ruled out. But then what exactly is
> missing and how can that be solved?
> 
> 2) If the resources are actually missing, then how does the driver
> find the required resources when I disable the ACPI from kernel?
> 
> Even if no body had faced this problem before, I would really
> appreciate if any one can provide ANY kind of pointers / information
> regarding this (As I am willing to explore and solve this, no matter
> what :-))
> 
> TIA
> 
> Rajat Jain
>