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Re: [Xen-devel] [PATCH v2] xen/arm: Switch OMAP5 secondary cores into hyp mode


  • To: Julien Grall <julien.grall@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Denis Obrezkov <denisobrezkov@xxxxxxxxx>
  • Date: Wed, 17 Jul 2019 18:32:33 +0200
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  • Cc: hy-gsoc@xxxxxxxxxxxxxxx, andre.przywara@xxxxxxx, sstabellini@xxxxxxxxxx, tim@xxxxxxx, drhunter95@xxxxxxxxx
  • Delivery-date: Wed, 17 Jul 2019 16:32:44 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

Hi Julien,

> 
> I am trying to understand how this ever worked. omap5_smp_init is called
> by two sets of platforms (based on compatible):
>    - ti,dra7: there were some hacks in U-boot to avoid the SMC. If I am
> right, then I would not bother to support hacked U-boot.
>    - ti,omap5: [1] suggest that U-boot do the switch for us but it is
> not clear whether this is upstreamed. @Chen, I know you did the port a
> long time ago. Do you recall how this worked?
> 
> Linux seems to use the smc on any dra7 and omap54xx. So maybe we can use
> safely here.
> I don't understand your concerns to the full extent. What should be
investigated?

-- 
Regards, Denis Obrezkov

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