Colibri imx8qxp: Missing kernel boot module

[Daniel Wagner2 <Daniel.Wagner2@xxxxxxxxxxxxxxxxxx>]

Hello xen-users,

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.

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?

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)?

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.pdf
[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_latest_
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,

Daniel

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