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Tetra (VL-EPC-2700) Reference Manual
KNOWN ISSUES
Hardware
Currently the VersaLogic PCIe card VL-MPEe-U2 does not work with the Tetra board
i.MX 6 SW controlled power-off is unsupported. In order to turn off the PMIC power output while
the power input to the board is still supplied, you must either hold the S2 power pushbutton in or
drive the PB_CTL_PWR# signal on the User IO connector (J13) low (with an open-drain driver)
since the input is level sensitive by default.
To get the U2 working on the EPC-2700, the Kernel config has to have PCI Messaging Signal
Interrupts disabled (CONFIG_PCI_MSI=n). When disabled, the U2 serial ports work in both RS232
or RS422/485 and the MPIOs also work.
