[coreboot] How to add a new SuperIO ?

[Agrain Patrick]

Hi all,

I'm trying to add a new superIO chip to the source tree.
The chip is an EXAR XR28V932.
I tried to take example of the existing superIO chips, like the i3100 and it8716 to compose a correct source tree as following:
[agrain1 at frilldlin059 coreboot]$ ls -als ./src/superio/exar/xr28v382/
total 10
1 drwxr-xr-x 2 agrain1 dhs2  512 Dec 16 09:03 .
1 drwxr-xr-x 3 agrain1 dhs2  512 Dec 15 09:41 ..
1 -rw-r--r-- 1 agrain1 dhs2  687 Dec 15 09:34 Makefile.inc
3 -rw-r--r-- 1 agrain1 dhs2 2614 Dec 16 09:03 superio.c
2 -rw-r--r-- 1 agrain1 dhs2 1287 Dec 15 16:28 xr28v382.h

I modified the devicetree.cb of my board (based on an Intel Mohon Peak) as following:
                        device pci 1f.0 on end # LPC bridge
                                chip superio/exar/xr28v382 # Super I/O
                                  device pnp 2e.0 on            # Com1
                                        io 0x60 = 0x3f8
                                        irq 0x70 = 4
                                  end
                                  device pnp 2e.1 off           # Com2
                                  end
                                  device pnp 2e.8 off           # Watchdog
                                  end
                                end
                        device pci 1f.3 on end # SMBus 0

Now the output of the console log (DEBUG level):
<...>
PCI: pci_scan_bus for bus 00
PCI: 00:00.0 [8086/1f0f] enabled
PCI: Static device PCI: 00:01.0 not found, disabling it.
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
child PNP: 002e.0 not a PCI device
<...>
PCI: 00:1f.0 [8086/1f38] enabled
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
child PNP: 002e.0 not a PCI device
child PNP: 002e.1 not a PCI device
child PNP: 002e.8 not a PCI device
PCI: 00:1f.3 [8086/1f3c] enabled
child PNP: 002e.0 not a PCI device
<...>
PCI: Left over static devices:
PNP: 002e.0
PNP: 002e.1
PNP: 002e.8
PCI: Check your devicetree.cb.
PCI: pci_scan_bus for bus 01
<...>
DOMAIN: 0000 (Intel Rangeley Northbridge)
PCI: 00:00.0 (Intel Rangeley Northbridge)
PCI: 00:01.0 (Intel Rangeley Northbridge)
PCI: 00:02.0 (Intel Rangeley Northbridge)
PCI: 00:03.0 (Intel Rangeley Northbridge)
PCI: 00:04.0 (Intel Rangeley Northbridge)
PCI: 00:0b.0 (Intel Rangeley Southbridge)
PCI: 00:0e.0 (Intel Rangeley Southbridge)
PCI: 00:13.0 (Intel Rangeley Southbridge)
PCI: 00:14.0 (Intel Rangeley Southbridge)
PCI: 00:14.1 (Intel Rangeley Southbridge)
PCI: 00:14.2 (Intel Rangeley Southbridge)
PCI: 00:14.3 (Intel Rangeley Southbridge)
PCI: 00:16.0 (Intel Rangeley Southbridge)
PCI: 00:17.0 (Intel Rangeley Southbridge)
PCI: 00:18.0 (Intel Rangeley Southbridge)
PCI: 00:1f.0 (Intel Rangeley Southbridge)
PNP: 002e.0 (EXAR XR28V382 Super I/O)
PNP: 002e.1 (EXAR XR28V382 Super I/O)
PNP: 002e.8 (EXAR XR28V382 Super I/O)
PCI: 00:1f.3 (Intel Rangeley Southbridge)
PCI: 00:0f.0 (unknown)
PCI: 01:00.0 (unknown)

I guess that the "" are not normal, isn't it ?
And so the " Check your devicetree.cb." ?
Moreover, I put a printk() in the init function of the chip and do not see it in the log.
What particular point should I also check to be sure that I do not miss anything ?

Thanks for your help.
Best regards,
Patrick Agrain