Kernel v5.2+ on HiKey960?

[Jerome Forissier <jerome@forissier.org>]

Hi,

Has anyone successfully run kernel v5.2 or later on a HiKey960 board?

For some reason, anything past v5.1 doesn't work for me and I could not
figure out why. The symptom is it never gets to the login prompt. The
root FS is a Buildroot-generated one, and prior to reaching the kernel
the board runs TF-A, OP-TEE, UEFI (edk2) and Grub.

I tried replacing /init with a shell, in which case I can type a command
but whatever it is (even a simple "ls"), the command hangs on exit and I
never get back to the prompt.

Then I started bisecting, that was quite painful but I found several
problematic commits. I ended up reverting the following (in this order)
to be able to boot v5.4:

1. "arm64: vdso: Substitute gettimeofday() with C implementation"
2. "arm64: vdso: Explicitly add build-id option"
3. "arm64: arch_timer: Ensure counter register reads occur with seqlock
    held"
4. "arm64: vdso: Remove stale files from old assembly implementation"

So the main thing appears to be the VDSO stuff, but if I do not also
revert the arch_timer commit I get a kernel panic:

[    4.657118] Run /init as init process
[    4.662380] Kernel panic - not syncing: Attempted to kill init!
               exitcode=0x00000004
[    4.670035] CPU: 7 PID: 1 Comm: init Not tainted 5.4.0-00003-
               g223b12c033fb #258
[    4.677338] Hardware name: HiKey960 (DT)
[    4.681253] Call trace:
[    4.683700]  dump_backtrace+0x0/0x148
[    4.687355]  show_stack+0x24/0x30
[    4.690664]  dump_stack+0xbc/0x100
[    4.694058]  panic+0x168/0x368
[    4.697105]  do_exit+0xa10/0xa28
[    4.700323]  do_group_exit+0x48/0xa8
[    4.703892]  get_signal+0xec/0x848
[    4.707287]  do_notify_resume+0x21c/0x480
[    4.711290]  work_pending+0x8/0x10
[    4.714689] SMP: stopping secondary CPUs
[    4.718607] Kernel Offset: disabled
[    4.722089] CPU features: 0x0002,21082004
[    4.726090] Memory Limit: none
[    4.729145] ---[ end Kernel panic - not syncing: Attempted to kill
               init! exitcode=0x00000004 ]---

Any idea what could be wrong with my setup?

Thanks,
-- 
Jerome

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