IMX8M Nano compatibility

From: "Kristiansen, Morten (INT)" <Morten.Kristiansen@Teledyne.com>
To: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: IMX8M Nano compatibility
Date: Wed, 28 Jul 2021 13:47:06 +0000	[thread overview]
Message-ID: <VI1PR04MB404687DFF801F6DFCDCF8617F3EA9@VI1PR04MB4046.eurprd04.prod.outlook.com> (raw)

Hi Everybody.

I have a boot problem on IMX8M Nano.

NXP provide a ported kernel for their evaluation board based on Linux 5.4.70. (https://source.codeaurora.org/external/imx/linux-imx, branch imx_5.4.70_2.3.0)

I managed to modify apply the ipipe-core-5.4.72-arm64-0.patch to apply to kernel. It required a few modifications for irq-imx-gpcv2.c.

The following files files was removed during the NXP port:
drivers/gpu/ipu-v3/ipu-prv.h
drivers/gpu/ipu-v3/ipu-common.c

For reference, I’ve attached my revised patch.

The end result is the kernel mostly boots fine, but about 1 out of 5 it fails with the message below. Has anybody had any luck running Xenomai on the IMX8M series?

Any help is highly appreciated. 😊

/Morten Kristiansen

[   12.672926] irq 103: nobody cared (try booting with the "irqpoll" option)
[   12.680938] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.70-2.3.2+g8c73bc625c4d #1
[   12.689246] Hardware name: NXP i.MX8MNano EVK board (DT)
[   12.695120] I-pipe domain: Linux
[   12.698889] Call trace:
[   12.702267]  dump_backtrace+0x0/0x140
[   12.706694]  show_stack+0x14/0x20
[   12.711023]  dump_stack+0xe4/0x12c
[   12.715277]  __report_bad_irq+0x48/0xd8
[   12.719873]  note_interrupt+0x2c4/0x37c
[   12.724448]  handle_irq_event_percpu+0x80/0x88
[   12.729604]  handle_irq_event+0x44/0xd0
[   12.734249]  handle_level_irq+0x90/0xe8
[   12.739058]  generic_handle_irq+0x24/0x38
[   12.743762]  __handle_domain_irq+0x60/0xb8
[   12.748789]  __ipipe_do_IRQ+0x28/0x30
[   12.753419]  __ipipe_do_sync_stage+0x198/0x1c8
[   12.758628]  ipipe_unstall_root+0x40/0x50
[   12.763370]  __do_softirq+0xa4/0x248
[   12.767896]  irq_exit+0xb8/0xd8
[   12.771730]  __handle_domain_irq+0x64/0xb8
[   12.776598]  __ipipe_do_IRQ+0x28/0x30
[   12.781055]  __ipipe_do_sync_stage+0x198/0x1c8
[   12.786295]  ipipe_unstall_root+0x40/0x50
[   12.791263]  cpuidle_enter_state+0xa4/0x330
[   12.796213]  cpuidle_enter+0x34/0x48
[   12.800673]  call_cpuidle+0x18/0x38
[   12.804939]  do_idle+0x1f0/0x288
[   12.808940]  cpu_startup_entry+0x20/0x50
[   12.813665]  rest_init+0xd4/0xe0
[   12.817842]  arch_call_rest_init+0xc/0x14
[   12.822659]  start_kernel+0x410/0x444
[   12.826855] handlers:
[   12.829882] [<00000000ab81b488>] irq_default_primary_handler threaded [<000000002543e636>] _tcpci_irq
[   12.840309] Disabling IRQ #103
[   24.092075] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[   24.098209] rcu:     0-...0: (5 ticks this GP) idle=b8e/0/0x3 softirq=80/80 fqs=2621
[   24.105801]  (detected by 2, t=5252 jiffies, g=-959, q=16)
[   24.111304] Task dump for CPU 0:
[   24.114554] swapper/0       R  running task        0     0      0 0x0000002a
[   24.121611] Call trace:
[   24.124099]  __switch_to+0x108/0x1c0
[   24.127695]  0x18

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