On 22.03.22 09:57, Mariusz Szafrański via coreboot wrote:
e.g. if we got from HOB info that physical stack x has preallocated PCI buses 0x20..0x2f, io form 0x2000..0x2fff, mem 0xd0000000..0xdfffffff, mem 0x10000000000...0x1ffffffffff and there are 2 root buses 0x20 and 0x28 instead of adding one domain with "physical" stack we added two domains with "virtual" stacks:
I'm still trying to learn what a "stack" comprises. I'm pretty sure most of the problems solve themselves if we map the Intel terms to standard and coreboot terms.
Would the following be a correct statement about stacks? A "stack" always has dedicated I/O port and memory ranges (that don't overlap with anything else, especially not with the ranges of other stacks) and has one or more PCI root buses.
If so, are the PCI bus numbers separate from those of other stacks? Or do all stacks share a single range of 0..255 PCI buses? In standard terms, do they share a single PCI segment group?
Nico