Cyril Plisko wrote:
On 11/14/06, Dan Mick <[EMAIL PROTECTED]> wrote:
>> Cyril, what happens when you enabled this BAR - presumably it needs
>> resources allocated to it?
>
> Yes, I need to map this BAR. If that is what you mean by allocating
> resources
well, "map this BAR" is ambiguous. Physical memory space needs to be
Hm, by "map this BAR" I mean that I want ddi_regs_map_setup() call to
succeed.
Is it less ambiguous now ?
Yes, but the problem is that's a multi-step process. First, the BAR has to
be programmed with the base address of the physical region allocated for
it; then, ddi_regs_map_setup() assigns a virtual address to that physical
address. The latter is what most people mean by "mapping", but it's not
going to happen without the first stage happening, which involves global
resource allocation.
(and, apparently, on this device, before all *that*, some device-specific
register must be written to even make the BAR appear.)
or other OSes, I bet.
I lack a relevant experience to say that for other OSes.
Would, say, Linux have similar problems with such a device ?
If I knew for certain, I wouldn't say "I bet", but, "I bet".
The only thought that comes to mind is a device-specific hack in the
generic allocation routines.
I am willing to invest some time into hacking this, what would be the
place to start looking at (from your experience) ? pci_autoconfig ?
yes; that's the global PCI enumerator and resource allocator.
when my laptop boots it spits the following message to /var/adm/messages.
Nov 14 08:54:54 zulu pci_autoconfig: [ID 771164 kern.info] NOTICE:
reprogram pci device [0/2/1] (pci1014,582)
Does it mean that similar hacks are already exist in pci_autoconfig ?
No, that's just assigning address space to BARs that are present but not
written to non-zero (physical) base addresses. This is one step further,
in that the BAR doesn't even appear to be present until device-specific
code runs.
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