On Tue, Feb 21, 2023 at 3:08 AM Yoshinoya <yoshinoyat...@163.com> wrote: > > Hi > Usually PciBus scan is from low bus num to high bus num. > > So, does it support scan from end bus num to start bus num? > > Thanks Hi,
What do you mean? Why do you want this? Do you want to number buses in reverse? That is technically doable (apart from probably the host bridge itself) but absolutely useless. If you mean "order of enumeration", then no. It is not possible. As PCI(e) topology works, you always start at the host bridge(s) (00:00.0) and its bus (bus 0, by definition), and then walk through whatever bridges you find. You cannot really start at any other place, unless you do some silly bruteforce method where you probe every bus for a device; and that method would not allow you to configure the buses and their BARs, as you need to. -- Pedro -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#100421): https://edk2.groups.io/g/devel/message/100421 Mute This Topic: https://groups.io/mt/97101911/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
