Re: [Xen-devel] ARMv8: New board bring up hangs in kernel start?

[Julien Grall <julien.grall@xxxxxxx>]

On 23/03/16 17:24, Dirk Behme wrote:
> Hi,
Hello Dirk,

Sorry for the late answer.

> trying to bring up Xen on a new ARMv8 64-bit Cortex A57 eval board, I
> get [1] and then its hanging there.
The logs look normal.

Do you know where the kernel get stuck? You can press CTRL-a 3 times to 
get access to the Xen console and then press:
* 0 => dump Dom0 registers
* d => dump registers

> I'd guess that it hangs due to missing timer interrupt, maybe missing
> interrupts at all?
>
> Any hints how to debug this? Or where to look?
>
> It might be possible that the board's firmware (arm-trusted-firmware
> based) doesn't configure anything correctly. Firmware is running at EL3,
> Xen at EL2. The same kernel is running fine without Xen.
>
> Using a JTAG debugger I've put breakpoints into xen/arch/arm/time.c
> timer_interrupt() & vtimer_interrupt() but these don't seem to be called
> at all (?)
They should be called if the timer is configured correctly.

> Best regards
>
> Dirk
>
> [1]
[...]

> (XEN) Checking for initrd in /chosen
> (XEN) RAM: 0000000048000000 - 000000007fffffff
> (XEN)
> (XEN) MODULE[0]: 0000000048000000 - 00000000480058a2 Device Tree
> (XEN) MODULE[1]: 0000000048200000 - 0000000048c00000 Kernel
> (XEN)
> (XEN) Command line: console=dtuart dom0_mem=512M loglvl=all
> (XEN) Placing Xen at 0x000000007fe00000-0x0000000080000000
> (XEN) Update BOOTMOD_XEN from 0000000049000000-0000000049112e01 =>
> 000000007fe00000-000000007ff12e01
> (XEN) Domain heap initialised
> (XEN) Platform: ARMv8 Cortex A57 64-bit eval board
> (XEN) Taking dtuart configuration from /chosen/stdout-path
> (XEN) Looking for dtuart at "/soc/serial@e6e88000", options ""
>   Xen 4.7-unstable
> (XEN) Xen version 4.7-unstable (dirk@build) (aarch64-poky-linux-gcc
> (Linaro GCC 4.9-2015.03) 4.9.3 20150311 (prerelease)) debug=y Mon Mar 21
> 09:15:03 CET 2016
> (XEN) Latest ChangeSet: Tue Feb 9 09:37:15 2016 +0100 git:b0a2893

I can't find this changeset in tree. Can you provide your baseline 
commit and the list of patches you applied on top?
Also have you tried a newer version of Xen?

Regards,

--
Julien Grall

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