Re: [Linux-ia64] [PATCH] 2.5.18 early printk, PCI segment, multi-IOMMU support

From: Bjorn Helgaas <bjorn_helgaas_at_hp.com>
Date: 2002-07-24 01:22:48
>   Bjorn> 60_pci_tra.diff Add support for PCI root bridges with
>   Bjorn> non-zero translation offsets.
>
> This one handles only memory offsets.  Any particular reason for this?
> Perhaps there should be at least a check which will warn/panic if a
> non-zero I/O offset is found?

Yup, there's a reason, but it's kind of lame:  I haven't figured
out how to deal with I/O offsets yet :-)  That gets into how
I/O spaces other than the legacy 64Kb space are described in
ACPI, and how the kernel accesses them.  So handling I/O
offsets will (I think) involve more extensive changes to I/O
port addressing.

-- 
Bjorn Helgaas - bjorn_helgaas at hp.com
Linux Systems Operation R&D
Hewlett-Packard Company
Received on Tue Jul 23 08:23:28 2002

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