[U-Boot] MinnowBoard Max uboot

[Beaman, Thomas]

Hi Simon,

I have just picked up u-boot-2015.07-rc2 with your support for multiple CPUs on the minnowboard max. I can see using the uboot cpu list command that both CPUs now show up.  But the kernel does not see 2 CPUs in /proc/cpuinfo. If I boot the same kernel using an EFI BIOS I do see 2 CPUs in /proc/cpuinfo. Is there some uboot to kernel hand off I do not have configured properly ? I am not sure how the number of CPUs gets transferred from the boot to the kernel. 

Thanks for any input you may have.
Tom

=> cpu list
  0: cpu at 0              Intel(R) Atom(TM) CPU  E3825  @ 1.33GHz
  1: cpu at 1              Intel(R) Atom(TM) CPU  E3825  @ 1.33GHz
 
## minnow max when booted from uboot 2015-07.rc2
root at atom_230:~# cat /proc/cpuinfo | grep processor
processor       : 0

## minnow max when booted from BIOS
root at atom_230:~# cat /proc/cpuinfo | grep processor
processor       : 0
processor       : 1



-----Original Message-----
From: sjg at google.com [mailto:sjg at google.com] On Behalf Of Simon Glass
Sent: Tuesday, March 10, 2015 1:21 PM
To: Beaman, Thomas
Cc: u-boot at lists.denx.de; Bin Meng; gabriel huau
Subject: Re: MinnowBoard Max uboot

Hi Tom,

On 10 March 2015 at 05:24, Beaman, Thomas <Thomas.Beaman at xerox.com> wrote:
> Hi Simon,
>
> Do you know what will be the timeframe of when someone may be able to 
> look at this in more detail. I will be able to help test any updates 
> if needed
>

I will take a look once I have things lined up for the next release, likely mid April.

Regards,
Simon

> Thanks,
> Tom
>
> -----Original Message-----
> From: sjg at google.com [mailto:sjg at google.com] On Behalf Of Simon Glass
> Sent: Monday, March 09, 2015 11:49 AM
> To: Beaman, Thomas
> Cc: u-boot at lists.denx.de; Bin Meng; gabriel huau
> Subject: Re: MinnowBoard Max uboot
>
> +Bin and Gabriel
>
> Hi Tom,
>
> On 9 March 2015 at 08:08, Beaman, Thomas <Thomas.Beaman at xerox.com> wrote:
>>
>>
>> Hi Simon,
>>
>>
>>
>> I see you have put support for the MinnowBoard Max in the u-boot mainline.
>> Thanks this is a very useful addition.  I have been able to follow 
>> your readme and build a working bare metal uboot. Using the built 
>> uboot I can load and bring up a Linux Kernel.
>>
>>
>>
>> What I noticed from the running kernel is that only one of the two 
>> cores on the E3825 is running. In the power PC uboots I usually see a 
>> section for the multiple cores in the .dts file. My questions is how 
>> do I get both CPUs running on this board. Is it a uboot .dts file 
>> setup that will enable this, or is something in the kernel start up that does this.
>>
>>
>>
>> As a test I boot the same kernel using the EFI BIOS on the minnow 
>> board and both CPUs are running.
>>
>>
>>
>> Any suggestions or comments you have would be welcomed.
>>
>>
>
> My guess is that the LAPIC CPU start-up is missing. It isn't 100% clear what the FSP does and does not do, but perhaps it does not do that.
>
> I did make something of a start on this with ivybridge but it isn't complete, and it seems to be needed here.
>
> Regards,
> Simon