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problems with armv5tel and hdpvr

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maclaren at tulane

Jul 30, 2010, 5:48 PM

Post #1 of 2 (452 views)
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problems with armv5tel and hdpvr

I am not sure if this is the right list or not, but I have, for fun,
installed a mythbackend on a Seagte Dockstar runn ing archlinux
2.6.34.1. When I try to record from my hd-pvr I get this.

kernel BUG at arch/arm/mm/dma-mapping.c:409!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 817 [#1] PREEMPT
last sysfs file:
/sys/devices/platform/orion-ehci.0/usb1/1-1/1-1.3/1-1.3:1.0/ttyUSB0/tty/ttyUSB0/uevent
Modules linked in: pl2303 usbserial hdpvr v4l2_common videodev
v4l1_compat ipv6 mv_cesa
CPU: 0 Not tainted (2.6.34.1 #1)
PC is at __bug+0x18/0x24
LR is at __bug+0x14/0x24
pc : [<c002e6f4>] lr : [<c002e6f0>] psr: 40000013
sp : c60bdee0 ip : c60bde50 fp : c62b7ec0
r10: c6dcbf6c r9 : c60bdf54 r8 : 00000000
r7 : 000000d0 r6 : 00000002 r5 : 00002000 r4 : ffc0b000
r3 : 00000000 r2 : c60bded4 r1 : c04815fd r0 : 00000033
Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 0005317f Table: 06160000 DAC: 00000017
Process hdpvr_buffer (pid: 1379, stack limit = 0xc60bc270)
Stack: (0xc60bdee0 to 0xc60be000)
dee0: ffc0b000 c0030910 c62b5e80 c7ea0c00 ffc0b000 c02b59a0 c608e000
c608e960
df00: c05357ac ffffffff c0506000 00000002 c6dcbf00 c6dcbf14 00000000
c60bc000
df20: 00000000 c60bdf54 c6dcbf6c bf07860c 00000001 c0036cf4 c608e960
c6dcbf60
df40: c6dcbf74 c6dcbf7c c6dcbf90 c60bdf60 00000b27 c004fce8 c608e000
c608e960
df60: c608e990 c608e960 c608e990 c62b7ea0 c60bc000 c62b7ea8 bf078578
c60bdf94
df80: c6dcbf94 00000000 c6dcbf90 c004fdb4 00000000 00000000 c608e960
c005380c
dfa0: c60bdfa0 c60bdfa0 c62b7ea0 c6fefdc0 c60bdfd4 c004fc2c c62b7ea0
00000000
dfc0: 00000000 00000000 00000000 c0053494 00000000 00000000 c60bdfd8
c60bdfd8
dfe0: 00000000 00000000 00000000 00000000 00000000 c002c414 00000000
00000000
[<c002e6f4>] (__bug+0x18/0x24) from [<c0030910>]
(___dma_single_cpu_to_dev+0x40/0xa8)
[<c0030910>] (___dma_single_cpu_to_dev+0x40/0xa8) from [<c02b59a0>]
(usb_hcd_submit_urb+0x6fc/0x884)
[<c02b59a0>] (usb_hcd_submit_urb+0x6fc/0x884) from [<bf07860c>]
(hdpvr_transmit_buffers+0x94/0x2c0 [hdpvr])
[<bf07860c>] (hdpvr_transmit_buffers+0x94/0x2c0 [hdpvr]) from
[<c004fdb4>] (worker_thread+0x188/0x240)
[<c004fdb4>] (worker_thread+0x188/0x240) from [<c0053494>]
(kthread+0x78/0x80)
[<c0053494>] (kthread+0x78/0x80) from [<c002c414>]
(kernel_thread_exit+0x0/0x8)
Code: e1a01000 e59f000c eb0eadcf e3a03000 (e5833000)
---[ end trace 47eeb8d36d67070f ]---
usb 1-1.2: USB disconnect, address 4

I have downloaded the latest v4l-dvb code and compiled no problem. I
have tried compiling a kernel. Has anyone used a hd-pvr on an arm
processor. I don't have much memory left once the backend and mysql are
running but they seem to work fine. I can record and playback on a
remote frontend shows recorded on the hdhomerun.
line 409 in that file is
BUG_ON(!virt_addr_valid(kaddr) || !virt_addr_valid(kaddr + size - 1));

Not even sure how to debug this one. Any pointers/help would be
appreciated.

Thanks
James

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tylernt at gmail

Jul 30, 2010, 7:28 PM

Post #2 of 2 (440 views)
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Re: problems with armv5tel and hdpvr [In reply to]

> I am not sure if this is the right list or not, but I have, for fun,
> installed a mythbackend on a Seagte Dockstar runn ing archlinux 2.6.34.1.
> When I try to record from my hd-pvr I get this.

/thread drift
Dang, you beat me to it! I'm compiling 0.23.1 on my Arch 2.6.33
DockStar right now. Did you compile on the Dockstar itself? I'm using
distcc on the 'Star and letting my SheevaPlug do the grunt work
because the 'Star keeps running out of RAM.

> I can record and playback on a remote frontend shows recorded
> on the hdhomerun.

Sweet, I'm very glad to hear the HDHR works!

> Not even sure how to debug this one. Any pointers/help would be
> appreciated.

Where are you sending your recordings, to a USB hard drive? I see your
kernel crashed with: "last sysfs file:
/sys/devices/platform/orion-ehci.0/usb1/1-1/1-1.3/1-1.3:1.0/ttyUSB0/tty/ttyUSB0/uevent"
and "usb 1-1.2: USB disconnect, address 4" which makes me wonder if
there is too much contention for the USB bus when recording from USB
to USB. Maybe try recording to a Samba/NFS share that lives elsewhere
on the network just to see if that clears up the issue?
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