This is normal for the first few cycles; it takes several cycles for the 
reference clock to “sync in”.  It should eventually start working.

This is why there’s a patch in the unofficial patchset to suppress the fprintf 
error when using the usermode library.

From: Mohsen Alizadeh Noghani
Sent: Friday, 26 October 2018 19:16
To: [email protected]
Subject: [etherlab-users] Failed to get reference clock time: Input/output error

Hello everyone.
When I call ecrt_master_reference_clock_time -right after 
ecrt_master_sync_slave_clocks()- in my userspace code, I get the following 
error every cycle.
Failed to get reference clock time: Input/output error.
I'm using stable-1.5 branch.
Has anyone been able to resolve this issue?
Best,
Mohsen

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