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CC3100BOOST: Can't get sl_DevGet to work

Part Number: CC3100BOOST

Dear TI-Team,

I've already been running the SPI Test sample successfully but unfortunately I can't sl_DevGet to work properly.
I did some debugging and I can see that the actual hick-up is in sl_DevGet's 

_SlReturnVal_t ret_val = _SlDrvCmdOp((_SlCmdCtrl_t *)&_SlDeviceGetCmdCtrl, &Msg, &CmdExt);

which returns -100 (SL_API_ABORTED, obviously)

Here's some logging output after sl_start:

SimpleLink started (mode: 0)
before _SlDrvCmdOp
_SlDrvCmdOp: call _SlDrvMsgWrite
TX 21 43 34 12
TX 66 84 08 00
IRQ triggered
NwpMaskInterrupt
Interrupt is now masked
TX 3c 2b 01 00 0c 00 00 20
TX 65 87 78 56
after _SlDrvResetCmdExt

RX 7b b9 9b 57 7b b9 9b 56
RX cc 08 70 00
RX 70 00 00 00
RX 00 00 02 00
RX 18 00 58 00
RX 00 00 00 08
RX 02 00 00 00
RX 04 00 00 00
RX 00 00 00 00
RX 04 00 00 00
RX 02 00 06 2e
RX 04 00 00 00
RX 04 00 00 00
RX 00 00 00 00
RX 02 00 00 00
RX 66 66 47 f3
RX 7b b9 9b 57 //  this line repeats 27 times
exited _SlDrvMsgReadCmdCtx
after _SlDrvCmdOp: -100

As suggested in post  I switchted to powering the boost from USB