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

[Julien Grall <julien.grall@xxxxxxx>]

On 19/06/2019 15:33, Denis Obrezkov wrote:
> Hi,
Hi Denis,

> ср, 19 июн. 2019 г. в 14:01, Andrii Anisov <andrii.anisov@xxxxxxxxx>:
> > On 18.06.19 19:19, Julien Grall wrote:
> > > Denis (the author of the thread) is doing a GSOC to port Xen on the BeagleBoard 
> > > X15. You ended up CCed because you can provide feedback how to proceed. Not 
> > > because we wanted you to implement it...
> > OK then.
> >
> > Denis,
> >
> > Feel free to contact me in case you need clarifications about the stuff.
> thank you
> > --
> > Sincerely,
> > Andrii Anisov.
Don't forget to strip unnecessary bits of the e-mail you quote :).

> So, right now I get a bit further and it seems that CPU1 was switched
> to hyp mode:
> https://github.com/embeddedden/xen/commit/2d76ae7aacb7c0ea7312eaddb91c3eb1e1963cc9
Nice to see some progress here! :)

Just to keep record of the discussion on IRC:

	- omap5_init_secondary is the entry point to Xen and SMC #0 is called right 
after. There are nothing in r2-r12 that we care about, so there are no need to 
save/restore them. On a side note, you could not use sp because we don't know 
the value stored in it. So you may rewrite Xen (or any other modules).
        
	- From the pastebin "(XEN) Generic Timer IRQ: phys=30 hyp=26 virt=27 Freq: 0 
KHz". It looks like the register CNTFREQ is not configured correctly on the CPU. 
Looking at Linux, they have code to setup CNTFRQ (set_cntfrq) for all the CPUs 
(see realtime_counter_init in arch/arm/mach-omap2/timer.c and 
omap4_secondary_init in arch/arm/mach-omap2/omap-smp.c).
	  In the case of Xen, I think we want to call set_cntfreq in omap5_init_time() 
for the boot CPU. For the secondary CPUs, we may need to introduce a callback in 
struct platform_desc to be called during secondary startup.
Lastly, please clean-up the code and send the patch on xen-devel. I will have a 
closer look at that time. Feel free to ping me on IRC if you have any doubt how 
to proceed.
> and the output:
> https://pastebin.com/3JBw6S4K
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Missing kernel boot module?
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Could not set up DOM0 guest OS
(XEN) ****************************************

You probably haven't set up the Dom0 kernel here. Check you u-boot runes for 
this.

Cheers,

--
Julien Grall

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel