Stefan Reinauer stepan@openbios.org writes:
- Liu Tao liutao@safe-mail.net [040922 04:57]:
I googled some results of amdk8 linuxbios, and seems after dev_enumerate() AMD8111 is not at bus0. So does it mean when we are running from the BIOS ROM the IO HUB must be at bus0, and when we are running in RAM the bus number doesn't matter?
Yes. So long as linux can find it. We just put it at bus 0 as convenience so we can find it easily.
Putting the hypertransport chains on their own bus is clearer reflection of reality than putting extra devices on bus 0.
I think to remember that Linux wants the IO Hub to hang off bus 0 as well. Which is why some ports reversed the probe order to achieve this. Maybe there is a more correct and generic solution to this?
As for linux so long as it can find the bus everything is good. Mostly that is a matter of putting the bus in the pirq table so linux will know about the bus.
Eric