> On Tuesday 06 May 2008, Simon Felix wrote:
>> The guest OS is Valhalla, my own OS.
>>
>> The problem is that the code doesn't find a single PCI device.
>
> I assume this is a 32-bit OS running in 32-bit protected mode?
>
> Kind regards,
>
> Frank
I found out what the problem was/is. When my code tries to read a byte from the
PCI configuration space, it does the following:
function readb(bus,dev,func,reg:byte):byte;
begin
outportl(PCI_ADR_REG,PCI_ENABLE or (longint(bus) shl 16) or (longint(dev) shl
11)
or (longint(func) shl 8) or longint(reg));
readb:=inportb(PCI_DATA_REG+(reg and 3));
end;
According to the PCI specs the last two bits written to the PCI_ADR_REG (0xcf8)
port must be zero. After changing the code to force the last two bits of "reg"
to zero everything worked as expected.
Simon
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