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Re: IDSEL assignment
>>>>> "Wilson" == Wilson Leung <firstname.lastname@example.org> writes:
Wilson> How does a typical PC route the IDSEL pins? Does it have a dedicated IDSEL
Wilson> pin (possibly from a bridge device) for each PCI agent/slot? Or if the AD
Wilson> are used and tied to the IDSEL signals of each agent?
The former. The bridge's control IDSEL.
The host bridge has some magic to control IDSEL, the PCI/PCI bridges
generate it in response to type 1 config cycles, generating a type 0 on
the secondary bus.
The host bridge's magic depends on the CPU, etc. but Intel host bridges
use I/O port 0x0C0 or some such.
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