BB-SPIDEV0 is automagically configured

[Andrey Somov]

Hi all,
my SPI0 is configured  and it works (the device which is connected to SPI0 functions properly)
Unfortunately, I do not understand how it is configured and I cannot ask the author.

Can you please give me a hint where I can find the configuration ?

root@beaglebone:~# uname -a
Linux beaglebone 3.8.13-bone70 #1 SMP Fri Jan 23 02:15:42 UTC 2015 armv7l GNU/Linux

1) The overlay looks good:
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-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPIDEV0

2) dmesg does not not say why BB-SPIDEV0 is loaded:

[  177.147378] bone-capemgr bone_capemgr.9: part_number 'BB-SPIDEV0', version 'N/A'
[  177.150423] bone-capemgr bone_capemgr.9: slot #7: generic override
[  177.150483] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 7
[  177.150533] bone-capemgr bone_capemgr.9: slot #7: 'Override Board Name,00A0,Override Manuf,BB-SPIDEV0'
[  177.150781] bone-capemgr bone_capemgr.9: slot #7: Requesting part number/version based 'BB-SPIDEV0-00A0.dtbo
[  177.150828] bone-capemgr bone_capemgr.9: slot #7: Requesting firmware 'BB-SPIDEV0-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
[  177.150898] bone-capemgr bone_capemgr.9: slot #7: dtbo 'BB-SPIDEV0-00A0.dtbo' loaded; converting to live tree
[  177.154033] bone-capemgr bone_capemgr.9: slot #7: #2 overlays

3) /boot/uEnv.txt does NOT have any changes (everything is commented out)

4) /etc/default/capemgr does not contain SPI:

# Default settings for capemgr. This file is sourced by /bin/sh from
# /etc/init.d/capemgr.sh

# Options to pass to capemgr
CAPE=

5) /etc/init.d/capemgr.sh does not have hard-coded BB-SPIDEV0

6) I decompile am335x-boneblack.dtb but there is no BB-SPIDEV0:

dtc -O dts -o ~/am335x-boneblack.dts -I dtb /boot/dtbs/3.8.13-bone70/am335x-boneblack.dtb

root@beaglebone:~# grep part-number ~/am335x-boneblack.dts | sed 's/^\s\+//'
part-number = "BB-BONE-GEIGER";
part-number = "BB-BONE-NIXIE";
part-number = "BB-BONE-TFT-01";
part-number = "BB-BONE-RTC-01";
part-number = "BB-BONE-HEXY-01";
part-number = "BB-BONE-MRF24J40";
part-number = "BB-BONE-RS232-01";
part-number = "BB-BONE-GPS-01";
part-number = "BB-BONE-EMMC-2G";
part-number = "BB-BONELT-HDMI";
part-number = "BB-BONELT-HDMIN";
part-number = "BB-BONE-DVID-01";
part-number = "BB-BONE-EMMC-2G";
part-number = "BB-BONE-GEIGER";
part-number = "BB-BONE-LCD3-01";
part-number = "BB-BONE-WTHR-01";
part-number = "BB-BONELT-HDMI";
part-number = "BB-BONE-NIXIE";
part-number = "BB-BONE-TFT-01";
part-number = "BB-BONE-RTC-01";
part-number = "BB-BONE-HEXY-01";
part-number = "BB-BONE-MRF24J40";
part-number = "BB-BONE-EXPTEST";
part-number = "BB-BONE-RS232-01";
part-number = "BB-BONE-GPS-01";
part-number = "BB-BONELT-HDMIN";
part-number = "2191";
part-number = "BB-BONE-LOGIBONE";

Why BB-SPIDEV0  is loaded ?

Cheers,
Andrey

[Robert Nelson]

 cat /proc/cmdline

Regards,

--

Robert Nelson
https://rcn-ee.com/

[Andrey Somov]

Well, I still do not get how BB-SPIDEV0 is configured:

root@beaglebone:~# cat /proc/cmdline
console=ttyO0,115200n8 root=UUID=6ba432c0-fb8d-4d56-862d-bb29f5c790d3 ro rootfstype=ext4 rootwait fixrtc quiet init=/lib/systemd/systemd

I searched the whole file system and could not find a text file with BB-SPIDEV0.

Can it be a compiled library which was installed ?

Cheers,
Andrey