Experimental Physics and
Industrial Control System

Jeong Han Lee via Tech-talk <tech-talk at aps.anl.gov> · Tue, 23 Mar 2021 15:15:42 -0700

Hi Kay,

On Tue, Mar 23, 2021 at 3:03 PM Kasemir, Kay <kasemirk at ornl.gov> wrote:
>
> Hello Han,
>
> >You have to allow all other cards to be booted after your cpu is ready
> >to communicate with each other through MCH pcie. The order is
>
> > 1 MCH / 2 CPU / 3 Others
>
> I have really no idea about MRF, but on some local uTCA setup the issue is that 'other' cards in the crate need time to boot up, and if the CPU is too fast, "lspci" will show cards with no memory etc. because they were not initialize when Linux on the CPU scanned the PCI bus.
> So for us the order is definitely
>
> 1) Have all the cards boot up
> 2) Then power the CPU

Ah, you are right, Kay. The proper order is

1. MCH
2. all others
3. CPU

I forgot them since I am not working anymore with the MTCA system.
That is my blessing now.

> .. and the MCH is thus configured to delay power to the CPU.
>

Yes, you can configure them through MCH, CPU, or both. Thank you for
correcting me always!

Han

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System