[Xen-devel] PCI-E serial board not working under Xen

["Andres Lagar-Cavilla" <andres@xxxxxxxxxxxxxxxx>]

Hi,

I've been banging my head against this serial board and I'd like to know
if anyone has tips.

It's an Oxford 0x1415:0xc138. It's located at 03:00.0, I've identified a
few problems with Xen's initialization.

First off, ns16550_parse_port_config string compares "pci" with
strncmp(conf, "pci", 5) which obviously fails. It should be 3. I can send
trivial patch.

Once that is left behind, reading the bar with pci_conf_read32(0,b,d,f,
PCI_BASE_ADDRESS_0) yields the mmio address of the first accessible
region, instead of the bar.

Linux inits this card fine, and reports three mmio regions at 0xfb600000
(size 16k), 0xfb400000 (size 2M) and 0xfb200000 (size 2M), BAR 1 with the
actual IO port at 0xfb601000 (one page inside the first mmio region). It
gets irq 19.

Going back to Xen, instead of reading bar=1, it reads the mmio offset of
the first region and then it naturally bails out. Even if it were to get
the right bar, the io_base value it would compute (bar & 0xfffe) would be
useless.

I've tried passing the explicit parameters
(com1=115200,8n1,0xfb601000,19,03:00.0), and the mere mention of an mmio
io port for the serial card hard freezes the hypervisor immediately.

Help, pointers, etc, are appreciated. I know next to nothing about PCI
config, so pardon my inaccurate ramblings.

Thanks,
Andres


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