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! 

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