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Date: Sun, 23 Feb 2014 17:37:18 -0500
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From: Adam Vaughan <vaughana@umich.edu>
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Subject: Re: [Xenomai] RaspberryPi kernel 3.8 issue
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To: Gregory Dymarek <gregd72002@gmail.com>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

I haven't tried using the official Xenomai Raspberry Pi 3.8.13 patch for a
few months now because I had some issue disabling the USB FIQ and I needed
to run alternate FIQ code.  I can't remember exactly what error I was
seeing, but my stopgap solution was to fall back to 3.5.7 (detailed below).
 I believe the USB FIQ disable issue I was seeing has been fixed in more
recent RPi kernels [1], but I haven't had a chance yet to try out that
patch with the Xenomai RPi 3.8.13 kernel.  It is curious that your 3.8.13
kernel log throws the exception at the same location just after the hub
detection as in [1] and involves the same USB code.  Perhaps they're
related?

If any kernel will work and you need to get up and going now, I had the
most success with the set of 3.5.7 patches at [2] (Google translate does a
good job translating the French, but it can also change acronyms in the
text such as RTDM to TDGR).  I did, however, have occasional 3.5.7 kernel
crashes at ext4 code with two different SD cards which haven't occurred
again since moving to the 3.10.11 Raspian distro (I'm working on frontend
code right now, and it's just easier doing it with vetted binaries).  These
infrequent crashes seemed to be associated with heavy file system accesses,
but it wasn't enough of issue that I needed to find a solution right then.

[1]  https://github.com/raspberrypi/linux/issues/355
[2]
http://www.blaess.fr/christophe/2013/02/15/raspberry-pi-interruptions-gpio-avec-rtdm/


On Sun, Feb 23, 2014 at 4:27 PM, Gregory Dymarek <gregd72002@gmail.com>wrote:

> Hi,
>
>
> I compiled a fresh rpi-3.8 kernel using the following patches (from
> xenomai-2.6.3):
> - ipipe-core-3.8.13-raspberry-pre-2.patch
> - ipipe-core-3.8.13-arm-3.patch
> - ipipe-core-3.8.13-raspberry-post-2.patch
>
> All compiled well, but when booting this kernel it reports an exception.
> The entire boot log is here: http://pastebin.com/K7v44nPw
>
> I am still not very faimiliar with the architecture so I am not really able
> to sort it myself...
> Any advise please?
>
> [    1.915956] hub 1-0:1.0: 1 port detected
> [    1.923672] ------------[ cut here ]------------
> [    1.931807] WARNING: at kernel/irq/handle.c:146
> handle_irq_event_percpu+0x190/0x1b4()
> [    1.943148] irq 32 handler usb_hcd_irq+0x0/0x7c enabled interrupts
> [    1.952840] Modules linked in:
> [    1.959469] [<c00141ec>] (unwind_backtrace+0x0/0xec) from [<c00204fc>]
> (warn_slowpath_common+0x4c/0x64)
> [    1.972561] [<c00204fc>] (warn_slowpath_common+0x4c/0x64) from
> [<c0020544>] (warn_slowpath_fmt+0x30/0x40)
> [    1.985872] [<c0020544>] (warn_slowpath_fmt+0x30/0x40) from [<c0077838>]
> (handle_irq_event_percpu+0x190/0x1b4)
> [    1.999671] [<c0077838>] (handle_irq_event_percpu+0x190/0x1b4) from
> [<c00778c0>] (handle_irq_event+0x64/0x94)
> [    2.013394] [<c00778c0>] (handle_irq_event+0x64/0x94) from [<c007a6c4>]
> (handle_level_irq+0x78/0x108)
> [    2.026432] [<c007a6c4>] (handle_level_irq+0x78/0x108) from [<c0077010>]
> (generic_handle_irq+0x1c/0x30)
> [    2.039690] [<c0077010>] (generic_handle_irq+0x1c/0x30) from
> [<c000eacc>] (handle_IRQ+0x30/0x84)
> [    2.052361] [<c000eacc>] (handle_IRQ+0x30/0x84) from [<c008036c>]
> (__ipipe_do_sync_stage+0x25c/0x278)
> [    2.065548] [<c008036c>] (__ipipe_do_sync_stage+0x25c/0x278) from
> [<c00083c4>] (__ipipe_grab_irq+0x2c/0x70)
> [    2.079312] [<c00083c4>] (__ipipe_grab_irq+0x2c/0x70) from [<c0422d14>]
> (__irq_svc+0x34/0xc0)
> [    2.091773] Exception stack(0xcd82de00 to 0xcd82de48)
> [    2.100766] de00: f2980008 00000000 00000000 00000000 00000000 00000000
> cd99ec00 c05db7c4
> [    2.112995] de20: cd9ed380 c05bbfc0 c0523a7c c05db8a4 00000030 cd82de48
> c02f947c c02f8e44
> [    2.125241] de40: 60000113 ffffffff
> [    2.132818] [<c0422d14>] (__irq_svc+0x34/0xc0) from [<c02f8e44>]
> (dwc_otg_driver_probe+0x114/0x7e0)
> [    2.146103] [<c02f8e44>] (dwc_otg_driver_probe+0x114/0x7e0) from
> [<c02aa504>] (really_probe+0x60/0x1e8)
> [    2.159771] [<c02aa504>] (really_probe+0x60/0x1e8) from [<c02aa778>]
> (__driver_attach+0x98/0x9c)
> [    2.172812] [<c02aa778>] (__driver_attach+0x98/0x9c) from [<c02a8b70>]
> (bus_for_each_dev+0x60/0x94)
> [    2.186145] [<c02a8b70>] (bus_for_each_dev+0x60/0x94) from [<c02a9cb8>]
> (bus_add_driver+0xac/0x244)
> [    2.199589] [<c02a9cb8>] (bus_add_driver+0xac/0x244) from [<c02aae20>]
> (driver_register+0x78/0x140)
> [    2.213103] [<c02aae20>] (driver_register+0x78/0x140) from [<c05a0074>]
> (dwc_otg_driver_init+0x20/0xe0)
> [    2.226973] [<c05a0074>] (dwc_otg_driver_init+0x20/0xe0) from
> [<c00086e0>] (do_one_initcall+0x114/0x180)
> [    2.241020] [<c00086e0>] (do_one_initcall+0x114/0x180) from [<c058c86c>]
> (kernel_init_freeable+0xf8/0x1b8)
> [    2.255236] [<c058c86c>] (kernel_init_freeable+0xf8/0x1b8) from
> [<c041c210>] (kernel_init+0x8/0x150)
> [    2.268963] [<c041c210>] (kernel_init+0x8/0x150) from [<c000dc40>]
> (ret_from_fork+0x18/0x38)
> [    2.282034] ---[ end trace 6e968ac9df7b1cbe ]---
> [    2.291589] dwc_otg: FIQ enabled
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