Hi Eunseok
available commands can be found in main.c its sources,
usage is given in attached Linux Manual p.22.
Execution file wiil be available after bulding sources or
using Demo images:
Board Support Packages (5)
i.MX28 Linux Binary Demo Files (REV L2.6.35_1.1.0)
i.MX28 Evaluation Kit|Freescale
Best regards
igor
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