Need PCI(e) vs PNP resource allocation help

[Keith Hui]

Hi guys,

I am again running into problems with my p8z77-m port[1].

My port fails to boot after trying to enable my hardware monitor. I
think I am running into a I/O port allocation conflict. The hardware
monitor needs to be allocated I/O port 0x290 and the actual accesses
would occur at 0x295/0x296. So I need to reserve ports 0x290-0x296 for
it, but I don't know how to go about this.

These are the devicetree.cb entries:

device pnp 2e.b on      # HWM, LED
io  0x60 = 0x290 # HWM address
drq 0xe4 = 0xf9 # GP50,52,55
drq 0xf0 = 0x3e # Enable all fan input debouncer
end

Attached are serial logs with and without the HWM devicetree entries.
You'll see a I/O port conflict with a PCIe root port device and the
boot froze when it tries to enable that device. There is no more
output after what is seen in the log with HWM. At least the
normal/fallback mechanism is working so I should not have to use my
Arduino again.

Help again appreciated.
Thanks
Keith

[1] https://review.coreboot.org/c/coreboot/+/38988

[Nico Huber]

Hi Keith,

On 18.03.20 23:55, Keith Hui wrote:
> These are the devicetree.cb entries:
>
> device pnp 2e.b on      # HWM, LED
> io  0x60 = 0x290 # HWM address
> drq 0xe4 = 0xf9 # GP50,52,55
> drq 0xf0 = 0x3e # Enable all fan input debouncer
> end

it looks like this 2e.b LDN has another i/o resource at 0x62. The
allocator often gets confused if a PNP device is enabled but the
resources are not assigned in the devicetree. Try setting it, maybe
even 0 works.

Nico

[Angel Pons]

Hi,

On Thu, Mar 19, 2020 at 9:52 AM Nico Huber  wrote:
> Hi Keith,
>
> On 18.03.20 23:55, Keith Hui wrote:
> > These are the devicetree.cb entries:
> >
> > device pnp 2e.b on      # HWM, LED
> > io  0x60 = 0x290 # HWM address
> > drq 0xe4 = 0xf9 # GP50,52,55
> > drq 0xf0 = 0x3e # Enable all fan input debouncer
> > end
>
> it looks like this 2e.b LDN has another i/o resource at 0x62. The
> allocator often gets confused if a PNP device is enabled but the
> resources are not assigned in the devicetree. Try setting it, maybe
> even 0 works.

It does, see CB:39299 as an example.
> Nico
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Best regards,

Angel