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halType is limited to the data type that are in hal: bit, float, s32, u32.
Whatever comes from ethercat will be shoe-horned into one of those.

What I see many times is the difficulty the get the xml file right both in relation to the ethercat device and in relation to the hal code.
Unfortunately, halshow et al aren't available until linuxcnc is started and it doesn't start until the xml is right.