RE: Colibri imx8qxp: Missing kernel boot module

[Peng Fan <peng.fan@xxxxxxx>]

> Subject: AW: Colibri imx8qxp: Missing kernel boot module
> 
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Xen-users <xen-users-bounces@xxxxxxxxxxxxxxxxxxxx> Im Auftrag von
> Julien
> > Grall
> > Gesendet: Freitag, 14. August 2020 21:46
> > An: Daniel Wagner2 <Daniel.Wagner2@xxxxxxxxxxxxxxxxxx>; xen-
> > users@xxxxxxxxxxxxxxxxxxxx; Peng Fan <peng.fan@xxxxxxx>
> > Betreff: Re: Colibri imx8qxp: Missing kernel boot module
> >
> > On 10/08/2020 16:32, Daniel Wagner2 wrote:
> > > Hello xen-users,
> >
> > Hello,
> >
> > > we are trying to get Xen running on a Toradex "Colibri iMX8X" module
> > > (see [1] at the bottom of this email), which features the iMX8 QXP
> prozessor.
> > > We found that NXP has a Xen reference implementation [2][3] for their
> > > MEK Module and tried to port that to the Toradex module.
> > >
> > > When booting via the bootscript [4], which is unaltered except for the
> > > "dom0fdt_file" and "xenhyper_bootargs" variables, we get the following
> > > error:
> > >
> > > [...] (See [5] for complete bootlog)
> > > (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) ****************************************
> > > (XEN)
> > > (XEN) Reboot in five seconds...
> > >
> > > For Dom0 we took the linux-toradex kernel source, ran "make xenconfig"
> > > [6], which should add Xen-support and rebuilt the Image with "make
> Image".
> > > For dom0 DTB [7] we copied the dom0 DTS NXP uses for their
> MEK-Module
> > > [8] and only adjusted the "bootargs" parameter.
> > > This Linux Image was able to run after we rebuilt and booted it without
> Xen.
> >
> > Which Device-Tree did you for boot Linux without Xen?
> 
> Used the same Device-Tree Binary that we want to use with Xen which is
> described in [7]. In [7] you can see rows 23 and 24, which include the
> Devicetree as it is supplied by Toradex.
> To boot linux with our dom0 DTB, the u-boot variable fdt_file was changed
> from fsl-imx8qxp-colibri-eval-v3.dtb to
> fsl-imx8qxp-colibri-eval-v3-dom0.dtb.


Did you use the U-Boot cmd 'xenmmcboot' or 'xennetboot'?

Regards,
Peng.

> 
> >
> > >
> > > Question 1:
> > > The xen dokumentation always states, that the Dom0- and DomU- Images
> > > have to be in zImage format, but according to [9] arm64 doesn't use
> > > zImage and [10] says the arm64/Image is equivalent to zImage.
> > > Can we assume that our arm64/Image should work, if everything else was
> > fine?
> >
> > This is a mistake in the documentation. Xen is able to load arm64/Image.
> 
> Thanks for the confirmation!
> 
> >
> > Can you give me a pointer to the documentation you are using? I will
> update it.
> >
> 
> ' where "/root/image" is a Linux zImage.'
> https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions#D
> omU
> _kernel_and_DTS
> 
> > >
> > > Question 2:
> > > Our Xen was build with imx-xen repository [11] as source via NXP's BSP
> > > according to [1] with MACHINE=imx8qxpmek.
> > > Can we use the resulting Xen Hypervisor-Image for the Toradex IMX8X
> > > Module, as it uses the same Processor (i.MX 8 QXP)?
> >
> > I am afraid this tree is not maintained by Xen Project but, IIRC, NXP. I
> have CCed
> > one person that may be able to help you.
> 
> Thanks for connecting!
> 
> > >
> > > Question 3:
> > > If the answers to Question 1 and Question 2 are yes, then what else
> > > could we be missing?
> > >
> > >
> > >
> > > [1]
> > >
> https://www.toradex.com/de/computer-on-modules/colibri-arm-family/nxp-
> > > imx-8x [2]
> > > https://www.nxp.com/docs/en/user-
> > guide/IMX_YOCTO_PROJECT_USERS_GUIDE.p
> > > df [3]
> > >
> https://www.nxp.com/docs/en/user-guide/IMX_LINUX_USERS_GUIDE.pdf
> > >
> > > Bootscript:
> > > [4] https://pastebin.com/dcj0K3Xb
> > >
> > > Complete Bootlog:
> > > [5] https://pastebin.com/eLpZvd29
> > >
> > > Xenconfig according to Xen Wiki
> > > [6]
> > >
> https://wiki.xenproject.org/wiki/Compiling_Xen_From_Source#Compiling_l
> > > atest_
> > > Linux_kernel_support
> > >
> > > fsl-imx8qxp-colibri-eval-v3-dom0.dts:
> > > [7] https://pastebin.com/f4dGCYFf
> > >
> > > fsl-imx8qxp-mek-dom0.dts:
> > > [8] https://pastebin.com/c3Ukc6mZ
> > >
> > > No arm64/zImage:
> > > [9] https://community.nxp.com/thread/482861#comment-1051436
> > >
> > > arm64/Image is equivalent to zImage:
> > > [10] http://markmail.org/message/advnw6lk5rcfyabp
> > >
> > > iMX-XEN Repo:
> > > [11]
> > >
> https://source.codeaurora.org/external/imx/imx-xen/tree/?h=imx_4.19.35
> > > _1.1.0
> > >
> > >
> > >
> > > Thank you very much for your reading this mail and helping with our
> issue!
> > >
> > > Best regards,
> >
> > Best regards,
> >
> > --
> > Julien Grall
> 
> Best regards,
> 
> Daniel Wagner