TS-8150-47XX Jumpers
From embeddedTS Manuals
The TS-8150 includes a header with several jumpers and signals:
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You can read JP6 with:
echo $(($(devmem 0xd4019004 32) >> 10 & 0x1))
This will return 0 when the jumper is on, and 1 when the jumper is off.