Cape Bacon & device tree issue on a BBB with 3.8.13 kernel

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1

Hello,

I would like to add a Cape Bacon on a BBB rev A6 but I can’t load & use the specific device tree for this cape.

I’m using Debian 7.9 for BBB on uSDCard.

root@beaglebone:~# uname -a

Linux beaglebone 3.8.13-bone79 #1 SMP Tue Oct 13 20:44:55 UTC 2015 armv7l GNU/Linux

I’ve disabled HDMI & eMMC to prevent any I/O conflict since Cape Bacon uses gpio4, gpio5…

My serial EEPROM on the Cape Bacon is empty (i.e. filled with 0xFF values), I don’t know why.

Slots seem to be ok.

root@beaglebone:~# cat /sys/devices/bone_capemgr.9/slots

0: 54:PF—

1: 55:PF—

2: 56:PF—

3: 57:PF—

4: ff:P-O-- Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G

5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI

6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN

7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-BACONE

The BB-BONE-BACONE-00A0.dtbo seems to be loaded

dmesg | grep cape

[ 0.000000] Kernel command line: console=tty0 console=ttyO0,115200n8 capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G root=/dev/mmcblk0p1 rootfstype=ext4 rootwait coherent_pool=1M quiet init=/lib/systemd/systemd cape_universal=enable

[ 0.875286] bone-capemgr bone_capemgr.9: Baseboard: ‘A335BNLT,00A6,4913BBBK0700’

[ 0.875326] bone-capemgr bone_capemgr.9: compatible-baseboard=ti,beaglebone-black

[ 0.875372] bone-capemgr bone_capemgr.9: Skipping disabled cape with part# BB-BONE-EMMC-2G

[ 0.875419] bone-capemgr bone_capemgr.9: Skipping disabled cape with part# BB-BONELT-HDMI

[ 0.875504] bone-capemgr bone_capemgr.9: Skipping disabled cape with part# BB-BONELT-HDMIN

[ 0.906506] bone-capemgr bone_capemgr.9: slot #0: No cape found

[ 0.943614] bone-capemgr bone_capemgr.9: slot #1: No cape found

[ 0.980722] bone-capemgr bone_capemgr.9: slot #2: No cape found

[ 1.017831] bone-capemgr bone_capemgr.9: slot #3: No cape found

[ 1.024099] bone-capemgr bone_capemgr.9: slot #4: specific override

[ 1.024137] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 4

[ 1.024164] bone-capemgr bone_capemgr.9: slot #4: ‘Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G’

[ 1.024298] bone-capemgr bone_capemgr.9: slot #5: specific override

[ 1.024329] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 5

[ 1.024354] bone-capemgr bone_capemgr.9: slot #5: ‘Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI’

[ 1.024492] bone-capemgr bone_capemgr.9: slot #6: specific override

[ 1.024522] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 6

[ 1.024547] bone-capemgr bone_capemgr.9: slot #6: ‘Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN’

[ 1.024818] bone-capemgr bone_capemgr.9: Skipping loading of disabled cape with part# BB-BONE-EMMC-2G

[ 1.024842] bone-capemgr bone_capemgr.9: Skipping loading of disabled cape with part# BB-BONELT-HDMI

[ 1.024862] bone-capemgr bone_capemgr.9: Skipping loading of disabled cape with part# BB-BONELT-HDMIN

[ 1.024880] bone-capemgr bone_capemgr.9: initialized OK.

[ 10.532360] bone-capemgr bone_capemgr.9: part_number ‘BB-BONE-BACONE’, version ‘N/A’

[ 10.532424] bone-capemgr bone_capemgr.9: slot #7: generic override

[ 10.532436] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 7

[ 10.532448] bone-capemgr bone_capemgr.9: slot #7: ‘Override Board Name,00A0,Override Manuf,BB-BONE-BACONE’

[ 10.532536] bone-capemgr bone_capemgr.9: slot #7: Requesting part number/version based 'BB-BONE-BACONE-00A0.dtbo

[ 10.532547] bone-capemgr bone_capemgr.9: slot #7: Requesting firmware ‘BB-BONE-BACONE-00A0.dtbo’ for board-name ‘Override Board Name’, version ‘00A0’

[ 10.532569] bone-capemgr bone_capemgr.9: slot #7: dtbo ‘BB-BONE-BACONE-00A0.dtbo’ loaded; converting to live tree

[ 10.532983] bone-capemgr bone_capemgr.9: slot #7: #7 overlays

[ 10.621483] bone-capemgr bone_capemgr.9: slot #7: Applied #7 overlays.

Everything looks fine but the device tree is not loaded

All suggestions are welcome !

Many thanks,
Regards

YA

2

Are you sure?

"bone-capemgr bone_capemgr.9: slot #7: Applied #7 overlays."

Looks loaded to me..

What are you expecting?

Regards,

3

Hello Robert,

Many thanks for your prompt reply.

I would like to set the gpio4 & gpio5 (normally used for eMMC) as an output but the logic level remains 0 even after echo 1 > value.

Regards,
YA

4

So what do those pins have to do with the bacon cape?

https://github.com/beagleboard/devicetree-source/blob/master/arch/arm/boot/dts/BB-BONE-BACONE-00A0.dts

Did you define them??

Regards,

5

Sorry I would like to say gpio0_5 (P9.17) and gpio0_4 (P9.18).

“P9.17”, /* shift: gpio0_5 LATCH /
“P9.18”, / shift: gpio0_4 SERIAL */

These pins remain at 0 logic level.
YA

6

gpio0_4, gpio0_5, not gpio4/gpio5 that's another bank..

should be already exported..

Regards

7

You are right, I’ve done a mess with the I/O, Cape Bacon is now up and running !

Many thanks for your help and for your amazing contribution to Linux for BBB.

Kind regards,
YA

8

Many thanks for your help and for your amazing contribution to Linux for BBB.

Maybe nitpicking, and a point that perhaps Robert does not care to toot his own horn over . . . But Robert contributes to Linux for far more than just the BBB. In the context of beagle hardware, probably 5-6 boards alone . . .Overall, I’d guess at 20-30 unique boards, but possibly more . . .

9

Hi Williams,

I totally agree with you, thanks for your comment.

Cheers,
YA