[U-Boot] Question regarding cpu_get_count(..)

[Christian Gmeiner]

Hi Bin

2018-04-06 9:47 GMT+02:00 Bin Meng <bmeng.cn at gmail.com>:
> Hi Christian,
>
> On Fri, Apr 6, 2018 at 2:55 PM, Christian Gmeiner
> <christian.gmeiner at gmail.com> wrote:
>> Hi
>>
>> I tried my luck on the u-boot irc channel but nobody cared so I am
>> asking this here again.
>> Does cpu_get_count(..) return the number of physical CPUs or the
>> number of logical CPUs?
>>
>> I am currently preparing a patch set which adds
>> arch/x86/cpu/queensbay/cpu.c and there I need
>> to specify a struct cpu_ops with a function called get_count(). But
>> what must I return (physical vs. logical CPU count)?
>>
>
> It's logical CPUs, say you have one physical CPU, each with
> dual-threads, so get_count() returns 2.
>

Good to know. I am looking into an issue where vxworks 7 intel gen is not able
to detect the correct amount of physical and logical CPUs (on a blob UEFI-Bios).
I compared the new platform with an older queensbay based one the there are some
discrepancies. As vx7 makes use of a handful of BIOS tables I thought I start at
the root (get_count()) and move up. So as a result of this that means that the
MP table has one "Processor Entry" per logical CPU - or? I tired to get that
information for the spec but failed.

> But Intel CrownBay already supports SMP in U-Boot. What patch are you
> working on?

I am out of office today and do not have access to my wip git rep :(
But I needed
to set some speed frequency registers.. but can tell you more on Monday.

-- 
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info