Kernel Panic: NULL pointer dereference

[como...@gmx.de]

Hello,

I do have a Problem booting my BeagleBone with a custom cape on. I already double checked my layout, i did not use any pins marked with mmc1 in the pintables of the system reference manual.

It will not boot if the cape is on. If I just plug in P9-Capeheader, it does boot. If I plug in the cape when the bone is up, it works.

For my PinOut I used http://exploringbeaglebone.com/wp-content/uploads/resources/BBBP8Header.pdf  from Derek Molloy and I didn't touch any of the marked pins but those "allocated for HDMI". I suppose the Problem might be there, though I disable the HDMI in the uEnv.txt.

On P8 I use the following Pins:

11,14,15,16,17,19,31,32,33,34,35,37,38,45

Here's the dump of a Startup with the cape on:

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2016.05.27 14:28:54 =~=~=~=~=~=~=~=~=~=~=~=
@uiP#!…W%ZDŒ XFPF©U

ü

U-Boot 2015.01-00001-gb2412df (Jan 29 2015 - 15:01:06), Build: jenkins-github_Bootloader-Builder-105

       Watchdog enabled
I2C:   ready
DRAM:  512 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC

cpsw
Hit any key to stop autoboot:  1 0
gpio: pin 53 (gpio 53) value is 1
Card did not respond to voltage select!
Card did not respond to voltage select!
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
switch to partitions #0, OK
mmc1(part 0) is current device
gpio: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
Checking for: /boot.scr ...
Checking for: /boot/boot.scr ...
Checking for: /boot/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
829 bytes read in 15 ms (53.7 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt...
gpio: pin 56 (gpio 56) value is 1
Running uname_boot ...
loading /boot/vmlinuz-3.8.13-xenomai-r72 ...
5741824 bytes read in 336 ms (16.3 MiB/s)
loading /boot/dtbs/3.8.13-xenomai-r72/am335x-boneblack.dtb ...
26098 bytes read in 33 ms (771.5 KiB/s)
loading /boot/initrd.img-3.8.13-xenomai-r72 ...
2286742 bytes read in 148 ms (14.7 MiB/s)
debug: [console=ttyO0,115200n8 capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN root=UUID=cf28a3f6-fcae-4d49-9887-f565a8bfbfaf ro rootfstype=ext4 rootwait fixrtc quiet init=/lib/systemd/systemd] ...
debug: [bootz 0x82000000 0x88080000:22e496 0x88000000] ...
Kernel image @ 0x82000000 [ 0x000000 - 0x579d00 ]
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Ramdisk to 8fdd1000, end 8ffff496 ... OK
   Loading Device Tree to 8fdc7000, end 8fdd05f1 ... OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
[    0.359272] omap2_mbox_probe: platform not supported
[    0.565509] tps65217-bl tps65217-bl: no platform data provided
[    0.631529] bone-capemgr bone_capemgr.9: slot #0: No cape found
[    0.666684] bone-capemgr bone_capemgr.9: slot #1: No cape found
[    0.701838] bone-capemgr bone_capemgr.9: slot #2: No cape found
[    0.736994] bone-capemgr bone_capemgr.9: slot #3: No cape found
[    0.757699] omap_hsmmc mmc.5: of_parse_phandle_with_args of 'reset' failed
[    0.821243] pinctrl-single 44e10800.pinmux: pin 44e10854 already requested by 44e10800.pinmux; cannot claim for gpio-leds.8
[    0.835783] pinctrl-single 44e10800.pinmux: pin-21 (gpio-leds.8) status -22
[    0.844867] pinctrl-single 44e10800.pinmux: could not request pin 21 on device pinctrl-single
[    0.929572] Unable to handle kernel NULL pointer dereference at virtual address 0000006c
[    0.940154] pgd = c0004000, hw pgd = de198000
[    0.945818] [0000006c] *pgd=00000000
[    0.950483] Internal error: Oops: 5 [#1] THUMB2
[    0.956352] Modules linked in:
[    0.960314] CPU: 0    Not tainted  (3.8.13-xenomai-r72 #1)
[    0.967446] PC is at inode_sb_list_add+0x14/0x34
[    0.973431] LR is at inode_sb_list_add+0xd/0x34
[    0.979305] pc : [<c01088e8>]    lr : [<c01088e1>]    psr: 60000033
[    0.979305] sp : df06fec8  ip : c09c63c0  fp : 00000000
[    0.994192] r10: c087f6dc  r9 : 00000000  r8 : 00000000
[    1.000964] r7 : de99ac68  r6 : 000041ed  r5 : c08caf2c  r4 : de99aad0
[    1.009428] r3 : 00000000  r2 : 00000000  r1 : de99ab90  r0 : c08caf2c
[    1.017892] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment kernel
[    1.027594] Control: 50c5387d  Table: 9e198019  DAC: 00000015
[    1.035042] Process swapper (pid: 1, stack limit = 0xdf06e238)
[    1.042605] Stack: (0xdf06fec8 to 0xdf070000)
[    1.048253] fec0:                   00000000 de99aad0 de999e30 c0109f7b de999e30 c01d865b
[    1.058861] fee0: ac677448 00000007 de996250 de999e30 000001ed de99ac68 00000000 00000105
[    1.069470] ff00: c087f6dc c01d87d7 00000000 00000000 00000000 df06e000 c090bdc0 00000000
[    1.080078] ff20: c0864531 c01d88a1 00000000 c09d38b0 c09d38b0 c0864549 c086c750 df06e000
[    1.090685] ff40: c090bdc0 c0008737 00000007 00000007 c08bf700 c086c74c c086c750 00000007
[    1.101294] ff60: c086c730 c090bdc0 c0847171 c087f6dc 00000000 c0847643 00000007 00000007
[    1.111905] ff80: c0847171 df04e580 00000000 c0505565 00000000 00000000 00000000 00000000
[    1.122512] ffa0: 00000000 c050556b 00000000 c000ca3b 00000000 00000000 00000000 00000000
[    1.133120] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    1.143724] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[    1.154353] [<c01088e8>] (inode_sb_list_add+0x14/0x34) from [<c0109f7b>] (new_inode+0xf/0x14)
[    1.165424] [<c0109f7b>] (new_inode+0xf/0x14) from [<c01d865b>] (debugfs_mknod.part.12.constprop.14+0x17/0xd8)
[    1.178405] [<c01d865b>] (debugfs_mknod.part.12.constprop.14+0x17/0xd8) from [<c01d87d7>] (__create_file+0xbb/0x134)
[    1.192060] [<c01d87d7>] (__create_file+0xbb/0x134) from [<c01d88a1>] (debugfs_create_dir+0x15/0x18)
[    1.203925] [<c01d88a1>] (debugfs_create_dir+0x15/0x18) from [<c0864549>] (clk_debug_init+0x19/0x78)
[    1.215779] [<c0864549>] (clk_debug_init+0x19/0x78) from [<c0008737>] (do_one_initcall+0x1f/0x100)
[    1.227414] [<c0008737>] (do_one_initcall+0x1f/0x100) from [<c0847643>] (kernel_init_freeable+0xb7/0x148)
[    1.239837] [<c0847643>] (kernel_init_freeable+0xb7/0x148) from [<c050556b>] (kernel_init+0x7/0x98)
[    1.251585] [<c050556b>] (kernel_init+0x7/0x98) from [<c000ca3b>] (ret_from_fork+0x13/0x38)
[    1.262421] Code: 69e2 f104 01c0 4613 (f853) 0f6c
[    1.268682] ---[ end trace 7cf44bf14a6ec482 ]---
[    1.274742] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    1.274742]

How can i fix this issue?

Thank you very much in advance! 

[Jan Meitner]

UPDATE: Once it is started, I can reboot without a problem, as long as power is not cut.

[Chris Morgan]

Can you provide a schematic for your cape?

On Fri, May 27, 2016 at 9:59 AM, Jan Meitner <como...@gmx.de> wrote:

UPDATE: Once it is started, I can reboot without a problem, as long as power is not cut.

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[Jan Meitner]

Sorry I cannot supply the schematic.

But I can give you the function of the Pins.

As P9 is working fine, I'll give you P8:

11: Input, theres a Button attached

14: Input, LM339 attached.

15: "

16: "

17: "

19: Output

31: Input, LM339 attached
32: Input, LM339 attached

33: Input, LM339 attached

34: Output

35: Input, LM339 attached

37: Serial Device attached

38: Serial Device attached

45: Output

[Jan Meitner]

PROBLEM SOLVED:

Using the Pins 31 to 46 on P8 with external Pullups causes the BBB to change it's startupsequence! You can use them after boot is finished.