Update:
Originally there was a "BB-SPIDEV1-00A0.dtbo" in the /lib/firmware
directory.
This file loads when enabled in the uEnv.txt.
The file is unique in the system (checked with find / )
Pin configuration of the pins if no .dtbo is loaded is 0x000027.
*Experiments:*
1. Changing the name of the original file (and in the uEnv.txt)
- The loading fails under boot.
2. Compiling the "BB-SPI1-SWP-01-00A0.dts" into a file
named "BB-SPIDEV1-00A0.dtbo" and copying it til /lib/firmware.
This file swaps the D0 and D1 pins.
- The load works, but the* pin configuration is identical with the
original file loaded, i.e. D0/D1 are not swapped*...??
3. Compiling same file into "BB-SPIDEV1-SWP-00A0.dtbo", cp to
/lib/firmware.
Removing overlay file load in uEnv.txt and loading BB-SPIDEV1-SWP
manually.
- The manual load works and *pins configuration is changed, D0/D1 are
swapped!*
Can anyone please explain this enigma??
Is there at all any down-to-earth documentation on this subject except for
all the hear-says?
Best regards
Terje Froysa
On Thursday, August 14, 2014 6:02:32 PM UTC+2, Terje Froysa wrote:
>
> Dear Forum,
>
> I have now turned the web outside-in to find an answer to this question.
> I see a lot of subjects touching the subject, but the answers and
> suggestions are mostly in the hear-say category and points in different
> directions putting me off in an endless ghost-hunt.
>
> I have been testing various overlays, some loads without problems, other
> won't load but can be manually loaded after boot.
> I can even rename an overlay that loads and it stops loading even if the
> content is identical.
> I have changed the sequence of loading proving that the file system is
> ready at the time of loading.
>
> I have tested the suggested solutions from:
> http://elinux.org/BeagleBone_Black_Enable_SPIDEV
>
> The .dtbo files does not load at boot, but can be loaded manually later.
> And working when loaded!
> The boot log gives no clue of what the problem may be.
>
>
> - Is it the content of the .dtbo?
> - Is it the name of the .dtbo file?
>
> Please advice
> Best regards
> Terje Froysa
>
> *Running system:*
>
> debian@beaglebone:~$ uname -a
> Linux beaglebone 3.8.13-bone50 #1 SMP Tue May 13 13:24:52 UTC 2014 armv7l
> GNU/Linux
> *Boot log showing BB-SPI1-SWP-01 not loading:*
> debian@beaglebone:~$ dmesg |grep BB-
> [ 0.000000] Kernel command line: console=tty0 console=ttyO0,115200n8
> capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
> capemgr.enable_partno=BB-I2C1,BB-SPI1-SWP-01
> root=UUID=5a42a22f-1771-4c44-93ef-8879c38b63d9 ro rootfstype=ext4 rootwait
> fixrtc quiet init=/lib/systemd/systemd
> [ 0.565888] bone-capemgr bone_capemgr.9: Skipping disabled cape with part#
> BB-BONELT-HDMI
> [ 0.565937] bone-capemgr bone_capemgr.9: Skipping disabled cape with part#
> BB-BONELT-HDMIN
> [ 0.714324] bone-capemgr bone_capemgr.9: slot #4:
> 'Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G'
> [ 0.714439] bone-capemgr bone_capemgr.9: slot #5:
> 'Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI'
> [ 0.714540] bone-capemgr bone_capemgr.9: slot #6:
> 'Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN'
> [ 0.714612] bone-capemgr bone_capemgr.9: enabled_partno part_number
> 'BB-I2C1', version 'N/A', prio '0'
> [ 0.714653] bone-capemgr bone_capemgr.9: slot #7: 'Override Board
> Name,00A0,Override Manuf,BB-I2C1'
> [ 0.714725] bone-capemgr bone_capemgr.9: enabled_partno part_number
> 'BB-SPI1-SWP-01', version 'N/A', prio '0'
> [ 0.714762] bone-capemgr bone_capemgr.9: slot #8: 'Override Board
> Name,00A0,Override Manuf,BB-SPI1-SWP-01'
> [ 0.714928] bone-capemgr bone_capemgr.9: Skipping loading of disabled cape
> with part# BB-BONELT-HDMI
> [ 0.714943] bone-capemgr bone_capemgr.9: Skipping loading of disabled cape
> with part# BB-BONELT-HDMIN
> [ 0.715135] bone-capemgr bone_capemgr.9: loader: before slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 0.715149] bone-capemgr bone_capemgr.9: loader: check slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 0.715228] bone-capemgr bone_capemgr.9: loader: before slot-7
> BB-I2C1:00A0 (prio 0)
> [ 0.715240] bone-capemgr bone_capemgr.9: loader: check slot-7 BB-I2C1:00A0
> (prio 0)
> [ 0.715732] bone-capemgr bone_capemgr.9: loader: check slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 0.718442] bone-capemgr bone_capemgr.9: loader: after slot-7 BB-I2C1:00A0
> (prio 0)
> [ 0.718462] bone-capemgr bone_capemgr.9: slot #7: Requesting part
> number/version based 'BB-I2C1-00A0.dtbo
> [ 0.718477] bone-capemgr bone_capemgr.9: slot #7: Requesting firmware
> 'BB-I2C1-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
> [ 0.718506] bone-capemgr bone_capemgr.9: slot #7: dtbo 'BB-I2C1-00A0.dtbo'
> loaded; converting to live tree
> [ 0.720710] bone-capemgr bone_capemgr.9: loader: before slot-8
> BB-SPI1-SWP-01:00A0 (prio 0)
> [ 0.720724] bone-capemgr bone_capemgr.9: loader: check slot-8
> BB-SPI1-SWP-01:00A0 (prio 0)
> [ 0.720740] bone-capemgr bone_capemgr.9: loader: after slot-8
> BB-SPI1-SWP-01:00A0 (prio 0)
> [ 0.720754] bone-capemgr bone_capemgr.9: slot #8: Requesting part
> number/version based 'BB-SPI1-SWP-01-00A0.dtbo
> [ 0.720770] bone-capemgr bone_capemgr.9: slot #8: Requesting firmware
> 'BB-SPI1-SWP-01-00A0.dtbo' for board-name 'Override Board Name', version
> '00A0'
> [ 0.721636] bone-capemgr bone_capemgr.9: loader: done slot-7 BB-I2C1:00A0
> (prio 0)
> [ 0.721672] bone-capemgr bone_capemgr.9: loader: check slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 1.075899] bone-capemgr bone_capemgr.9: failed to load firmware
> 'BB-SPI1-SWP-01-00A0.dtbo'
> [ 1.084703] bone-capemgr bone_capemgr.9: loader: failed to load slot-8
> BB-SPI1-SWP-01:00A0 (prio 0)
> [ 1.094196] bone-capemgr bone_capemgr.9: loader: check slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 1.094214] bone-capemgr bone_capemgr.9: loader: after slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
> [ 1.122393] bone-capemgr bone_capemgr.9: loader: done slot-4
> BB-BONE-EMMC-2G:00A0 (prio 1)
>
> *Verify overlay not loaded:*
>
> root@beaglebone:/home/debian# cat $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-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
> 6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
> 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-I2C1
>
> *Manually loading same overlay:*
> root@beaglebone:/home/debian# echo BB-SPI1-SWP-01 > $SLOTS
> root@beaglebone:/home/debian# cat $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-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
> 6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
> 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-I2C1
> 9: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPI1-SWP-01
> root@beaglebone:/home/debian# ls /dev |grep spi
> spidev1.0
>
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