Debian 8.3 Write to CapeMgr slots failed: EINVAL, invalid argument

[Andrewiski]

steps to reproduce.
Using a BeagleBone Green Fresh lxqt-4gb Linux beaglebone 4.4.8-ti-r22 #1 SMP Wed Apr 27 22:23:10 UTC 2016

apt-get update
apt-get upgrade

systemctl disable cloud9.service
systemctl disable gateone.service
systemctl disable bonescript.service
systemctl disable bonescript.socket
systemctl disable bonescript-autorun.service
systemctl disable avahi-daemon.service
systemctl disable gdm.service
systemctl disable mpd.service

app.js

var boneScript;

try {
    boneScript = require('octalbonescript');
    boneScript.getPlatform(function (err, x) {
        console.log('bonescript getPlatform');
        console.log('version = ' + x.version);
        console.log('serialNumber = ' + x.serialNumber);
        console.log('dogtag = ' + x.dogtag);
    });
} catch (e) {
    console.log(e);
}

package.js

{
  "name": "test-bonescript",
  "version": "0.0.0",
    "description": "testBonescript",
    "scripts": {
    "start": "node ./app.js",
    "stop": "pkill --signal SIGINT testBoneScript"
  },
  "main": "app.js",
    "author": {
        "name": "adevries",
        "email": "adevries at digitalexample.com"
    },
    "dependencies": {
        "octalbonescript": "^1.2.0"
    }
}

npm install
sudo DEBUG=bone node app.js

bone Using Universal Cape interface +0ms bone is_ocp() = /sys/devices/platform/ocp +83ms bone find_sysfsFile(cape-universal,/sys/devices/platform/ocp,ocp:cape-universal) +20ms bone is_cape_universal() = null +8ms bone Loading Universal Cape interface... +2ms bone load_dt_sync(cape-universaln) +6ms bone onFindCapeMgr: path = /sys/devices/platform/bone_capemgr +3ms bone onReadSlots: index = -1, readAttempts = 1 +7ms bone Writing cape-universaln to /sys/devices/platform/bone_capemgr/slots +2ms { [VError: Write to CapeMgr slots failed: EINVAL, invalid argument] jse_shortmsg: 'Write to CapeMgr slots failed', jse_summary: 'Write to CapeMgr slots failed: EINVAL, invalid argument', jse_cause: { [Error: EINVAL, invalid argument] errno: -22, code: 'EINVAL', syscall: 'write' }, message: 'Write to CapeMgr slots failed: EINVAL, invalid argument' }

[Andrewiski]

a check of ‘cat /sys/devices/platform/bone_capemgr/slots’ output is 0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1

Not how no universal cape is loaded.

Console Debug from unchanged image 2016-05-01 shows error Could not find symbol 'pruss' [ 25.116787] bone_capemgr bone_capemgr: slot #4: Failed to resolve tree

Following the instructions on https://github.com/RobertCNelson/bb.org-overlays

I did a sudo /opt/scripts/tools/update_kernel.sh --lts-4_4 --bone-channel

now the 'pruss' error above is resolved and ‘cat /sys/devices/platform/bone_capemgr/slots’ output is

0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,univ-emmc

a retry of above results are

debian@beaglebone:/var/testBonescript$ sudo DEBUG=bone node app.js trying OctalboneScript bone Using Universal Cape interface +0ms bone is_ocp() = /sys/devices/platform/ocp +85ms bone find_sysfsFile(cape-universal,/sys/devices/platform/ocp,ocp:cape-universal) +18ms bone is_cape_universal() = /sys/devices/platform/ocp/ocp:cape-universal +7ms bone Loading HDMI Cape... +6ms bone load_dt_sync(cape-univ-hdmi) +4ms bone onFindCapeMgr: path = /sys/devices/platform/bone_capemgr +1ms bone onReadSlots: index = -1, readAttempts = 1 +5ms bone_capemgr bone_capemgr: slot #5: cape-univ-hdmi conflict P8.27 (#4:univ-emmc) [32;1mbone Writing cape-univ-hdmi to /sys/devices/platform/b[ 5901.954752] bone_capemgr bone_capemgr: slot #5: Failed verification one_capemgr/slots +1ms { [VError: Write to CapeMgr slots failed: EEXIST, file already exists] jse_shortmsg: 'Write to CapeMgr slots failed', jse_summary: 'Write to CapeMgr slots failed: EEXIST, file already exists', jse_cause: { [Error: EEXIST, file already exists] errno: -17, code: 'EEXIST', syscall: 'write' }, message: 'Write to CapeMgr slots failed: EEXIST, file already exists' }

So progress on that front but the next error is because it is trying to force the load of unversial when it is already loaded.

per @RobertCNelson we should check to see if unversial is already loaded instead of just loading it

https://github.com/RobertCNelson/boot-scripts/blob/master/boot/am335x_evm.sh#L321-L407

I will attempt a patch for this logic

[Andrewiski]

env check is already there to prevent autoload of cape and based on what I see with base Debian Image whcih already auto loads the universial Cape. I would think that should be the default behavior.

Anyways setting AUTO_LOAD_CAPE=0 disables the load of the already loaded cape and no more errors

sudo DEBUG=bone AUTO_LOAD_CAPE=0 node app.js

[Andrewiski]

Newer Debian images got posted today with updated Kernels so default image now works as expected but AUTO_LOAD_CAPE=0 is still needed to prevent the attempt to load an already loaded cape on the Beaglebone Green

[adityapatadia]

Let me get back to you this Saturday. I am sorry it's hard to reply and resolve issue during weekdays.

[Andrewiski]

Pull request #69 posted with both patches for i2c and universal cape autoload fixes. @adityapatadia