How to tell the cape-manager to load BB-BONE-LCD4-01 in a slot without using an eeprom

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1

Dear All,

I hope that anybody can explain what is happening here.

On my fresly installed BBBI * I have attached a LCD CAPE 4.3" cape (have changed the adres)
I have edited /boot/uEnv.txt en have uncommented : dtb=am335x-boneblack-emmc-overlay.dtb .
After reboot the LCD was working as expected, and the cape manager slots gives:

root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots 0: PF---- -1 1: PF---- -1 2: P---L- 0 4D 4.3 LCD CAPE- 4DCAPE-43T ,00A1,4D SYSTEMS ,BB-BONE-LCD4-01 3: PF---- -1 root@beaglebone:~#

Powering Down the BBBI, removing the LCD and rebooting, gives empty slots ( also as expected ).

I would now like to enable the cape without using the eeprom (to test I have not placed the LCD board on the BBBI).

`

root@beaglebone:~# echo BB-BONE-LCD4-01 > /sys/devices/platform/bone_capemgr/slots
-bash: echo: write error: No such file or directory
root@beaglebone:~#

`

If I check with dmesg it seems that it the cape manager has tried to do something:

`

beaglebone:~# dmesg | grep bone_capemgr

[ 2.326191] bone_capemgr bone_capemgr: Baseboard: ‘A335BNLT,EIA0,4816BBBK37B2’
[ 2.326226] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
[ 2.365381] bone_capemgr bone_capemgr: slot #0: No cape found
[ 2.409373] bone_capemgr bone_capemgr: slot #1: No cape found
[ 2.453370] bone_capemgr bone_capemgr: slot #2: No cape found
[ 2.497369] bone_capemgr bone_capemgr: slot #3: No cape found
[ 2.503266] bone_capemgr bone_capemgr: initialized OK.
[ 51.567215] bone_capemgr bone_capemgr: part_number ‘BB-BONE-LCD4-01’, version ‘N/A’
[ 51.567258] bone_capemgr bone_capemgr: slot #4: override
[ 51.572738] bone_capemgr bone_capemgr: Using override eeprom data at slot 4
[ 51.572760] bone_capemgr bone_capemgr: slot #4: ‘Override Board Name,00A0,Override Manuf,BB-BONE-LCD4-01’
root@beaglebone:~#

`

When I the slots, the BB-BONE-LCD4-01 does not show up

`
root@beaglebone:~# slots
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
root@beaglebone:~#

`

Is there anyone who has got an clue why this is not working I would expect that on slot 4 the BB-BONE-LCD4-01 would be?

As a final test I have tested BB-UART1 but this seems to work with no problem at all

`

root@beaglebone:~# echo BB-UART1 > /sys/devices/platform/bone_capemgr/slots
root@beaglebone:~# slots
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
4: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-UART1
root@beaglebone:~#

`

So what is the difference between using the BB-BONE-LCD4-01 and the BB-UART1 ?

Best regards,
Carl

2

next time you see this, just type:

dmesg | tail

and you'll see what actually happened..

Regards,

3

Hello Robert,

Thank you for your reply, I have repeated this test, with “dmesg | tail” (see below and complete dmesg as attachment).

With no capes attached* I echo echo BB-BONE-LCD4-01 to the slots, this does not work as I would expect, then I echo BB-UART1 to the slots and this seems to work.

Unfortunately I still do not understand why the echo of BB-UART1 is ok and works and the echo of BB-BONE-LCD4-01 reacts differently and does not appear in the slots.

Do you understand what the difference is, why can’t I load the BB-BONE-LCD4-01 with the echo command?

`

Debian GNU/Linux 8

BeagleBoard.org Debian Image 2017-01-08

Support/FAQ: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian

default username:password is [debian:temppwd]

Last login: Sat May 21 22:31:48 2016 from 10.0.0.209
root@beaglebone:~# echo BB-BONE-LCD4-01 > /sys/devices/platform/bone_capemgr/slots
-bash: echo: write error: No such file or directory
root@beaglebone:~# dmesg | tail
[ 20.666392] net eth0: initialized cpsw ale version 1.4
[ 20.666402] net eth0: ALE Table size 1024
[ 20.669077] net eth0: phy found : id is : 0x7c0f1
[ 20.688124] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 23.682395] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 23.682517] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 53.311854] bone_capemgr bone_capemgr: part_number ‘BB-BONE-LCD4-01’, version ‘N/A’
[ 53.311897] bone_capemgr bone_capemgr: slot #4: override
[ 53.317405] bone_capemgr bone_capemgr: Using override eeprom data at slot 4
[ 53.317427] bone_capemgr bone_capemgr: slot #4: ‘Override Board Name,00A0,Override Manuf,BB-BONE-LCD4-01’
root@beaglebone:~# echo BB-UART1 > /sys/devices/platform/bone_capemgr/slots
root@beaglebone:~# dmesg | tail
[ 53.311854] bone_capemgr bone_capemgr: part_number ‘BB-BONE-LCD4-01’, version ‘N/A’
[ 53.311897] bone_capemgr bone_capemgr: slot #4: override
[ 53.317405] bone_capemgr bone_capemgr: Using override eeprom data at slot 4
[ 53.317427] bone_capemgr bone_capemgr: slot #4: ‘Override Board Name,00A0,Override Manuf,BB-BONE-LCD4-01’
[ 65.408052] bone_capemgr bone_capemgr: part_number ‘BB-UART1’, version ‘N/A’
[ 65.408096] bone_capemgr bone_capemgr: slot #5: override
[ 65.413576] bone_capemgr bone_capemgr: Using override eeprom data at slot 5
[ 65.413596] bone_capemgr bone_capemgr: slot #5: ‘Override Board Name,00A0,Override Manuf,BB-UART1’
[ 65.439573] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 184, base_baud = 3000000) is a 8250
[ 65.440268] bone_capemgr bone_capemgr: slot #5: dtbo ‘BB-UART1-00A0.dtbo’ loaded; overlay id #0
root@beaglebone:~# slots
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
5: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-UART1
root@beaglebone:~#

`

Best regards,
Carl

*and in /boot/uEnv.txt I still have uncommented: dtb=am335x-boneblack-emmc-overlay.dtb

CompleteDmesg-20-1-2017.txt (22.1 KB)