[SeaBIOS] [PATCHv6 00/16] boot order specification

Peter Stuge peter at stuge.se
Sun Nov 28 20:11:45 CET 2010

Peter Stuge wrote:
> Specifying boot device using PCI BDF is a great example of using
> common structured data. That BDF exists both in machine and firmware
> data models.

Gleb Natapov wrote:
> Bus numbers are assigned by a guest. Qemu knows nothing about them,
> so it specify device path by topology.

Quite. By BDF I of course mean topology. ;)

The BDF itself is not much better than a BBS concept, since only the
firmware knows the details.

But the topology is common, even if bus number differs between
machine and firmware.

How is the topology structured? I'm not sure that firmware can use a
"slot" number. Device number on the bus works, is that what you mean?


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