"David Hendricks" <[EMAIL PROTECTED]> writes: > I know you guys aren't AMD tech support, I was hoping someone could help > me figure this problem out. In section 3.3.8 (page 35) of their BIOS and > Kernel developers guide ( > http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF > > ), they have a 32-bit UnitID register. The example given lists the lowest > four bits as follows: > 3-2: CPU1 Unit ID > 1-2: CPU0 Unit ID > > Ok, so you could give CPU1, CPU2, and CPU3 a unique ID with two binary > digits, but I thought we were supposed to be able to have eight (or more?) > CPUs? > > Is there something obvious I'm missing? The context. The unitid referred to are all internal to the cpu.
On current cpu implementations only CP0 is present so it is a little confusing. > Is the CPU Unit ID the same as the NodeID, or different? Different. > Do these CPU Unit IDs even have to be unique for each CPU? Yes. > I was thinking perhaps the CPU1 Unit ID is used only by a noncoherant > device attached via Hypertransport link to what it thinks is CPU1 to > differentiate the CPU it's attached to from CPU0. If this is true, is it > necessary since the bootstrap processor, CPU0, is the only one with access > to its northbridge and memory controller at this point? > > Sorry if all this is complete and utter nonsense, I'm just a very curious > newbie. There is a lot integrated into an opteron and it takes some serious looking to really see what is going on. Eric _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
