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TMS570LS3137: About confirmation method of "HET 5 A Boot Time Software Test of Function Using I / O Loopback"

Part Number: TMS570LS3137

About confirmation method of "HET 5 A Boot Time Software Test of Function Using I / O Loopback"

Is it necessary to use microcode when performing HET Loopback?
Or can you satisfy Loopback by using HETDOUT?