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MobiCore Daemon in Android
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Command line
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The MobiCore Daemon supports 4 command line options. It also displays them with the help option:
# ./mcDriverDaemon -h
usage: ./mcDriverDaemon [-mdsbh]
Start MobiCore Daemon
-h show this help
-b fork to background
-m IMAGE load mobicore from IMAGE to DDR
-s disable daemon scheduler(default enabled)
-d SIZE donate SIZE bytes to mobicore(disabled on most platforms)
-r DRIVER load dyamic driver
-b Forks the daemon to background
# ./mcDriverDaemon -b
Makes the daemon run in background and returns immediate control to the shell. No need to use shell forking with &
-m Loads a mobicore image to DDR
# ./mcDriverDaemon -m /data/app/mobicore.img
Loads the mobicore.img to DDR and starts executing it.
-s Disables NQ IRQ scheduler
# ./mcDriverDaemon -s
-d Sets how much RAM is donated to Mobicore in bytes
# ./mcDriverDaemon -d 1048576
If no -d is specified then the daemon donates 1Mb. The Value 0 disables RAM donation.
-r Loads dynamic driver at startup. The full path of the driver binary must be given, eg. /data/app/driver.drbin
# ./mcDriverDaemon -r /data/app/driver.drbin
Custom registry locations
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Registry fallback
In case of a Device wipe in Android the /data/app/mcRegistry folder will be deleted with all it's contents. To overcome
this the daemon supports a fallback location(eg /system/app/mcRegistry): it first tries to load the trustlet
from /data/app/mcRegistry/[uuid].tlbin and if it fails then it tries to read the trustlet from /system/app/mcRegistry/[uuid].tlb
Both paths are completely configurable for the Daemon using 2 environment variables:MC_REGISTRY_PATH and MC_REGISTRY_FALLBACK_PATH
For example if you want to use /data/app/mcRegistry as the default path and /system/app/mcRegistry as the fallback path:
$ export MC_REGISTRY_PATH=/data/app/mcRegistry
$ export MC_REGISTRY_FALLBACK_PATH=/system/app/mcRegistry
$ /data/app/mcDriverDaemon
Custom authtoken path
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The authtoken file is created at provisioning and is by default located in /data/app/mcRegistry/00000.authtoken
Because a device wipe could delete this file and make MobiCore unusable a new environment variable has been added to change the
default behaviour: MC_AUTH_TOKEN_PATH
$ export MC_AUTH_TOKEN_PATH=/efs
$ /data/app/mcDriverDaemon
This would change the location of the authtoken file to /efs