Re: [Xen-users] Starting to port xen on beagleboard-x15 (GSoC 2019 project)

[Julien Grall <julien.grall@xxxxxxx>]

On 18/06/2019 11:33, Oleksandr Tyshchenko wrote:
> Hello all.
Hi,

> Sorry for the top-posting.
>
> > I have also CCed Oleksandr, who IIRC worked on a platform using the same SoC
> > (DRA7) in the past.
> Yes. I worked with DRA7 sometime ago. Unfortunately, I don't remember this 
> platform in details, but, there is a Wiki page describing how to run Xen on this 
> platform which *may* help:
> https://wiki.xenproject.org/wiki/User:Xen_intruction_setup_for_dra7xx-evm_board
> Please note, it is related to old Xen and TI GLSDK versions.
>
> Regarding secondary CPU boot.
> The special monitor API is used to enable Hyp mode. U-Boot brings secondary CPU 
> up, which, it turn, switches to Hyp mode and enters WFE until Xen wakes it up.
> Take a look at the following patch:
> https://github.com/inisider/gl_patches/blob/master/dra7xx-evm/glsdk/0007-Add-virtualization-support-for-dra7xx-evm.patch#L591
I am a bit confused. Linux is able to bring-up CPU in hyp mode with the current 
U-boot. Why would we need more changes for Xen?
Cheers,

--
Julien Grall

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