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DRA712: how to shutdown DSP

Part Number: DRA712

Hi, expert:

My customer use DRA712 for configurable digital cluster application. The A15 core runs QNX 6.6.

Customer checked the vdda_dsp_iva power rail, it shows about >200mA current. As there is no DSP in DRA712, we want to totally shut down the DSP power, to minimize the power current on vdda_dsp_iva.

Please kindly guide us on how to shut down DSP power.

Many thanks.

  • Hi Peter,

    The programming of the PMIC is done in the QNX BSP, as part of the IPL code.  Reference src/hardware/ipl/init_voltages.c, function do_scale_vcore().

    In terms of suggested file to modify, customer should be directed to src/hardware/ipl/boards/dra71x/arm/evm.le.v7/board.c, function init_core_voltages() where the calls to do_scale_vcore() are made

    Once code is modified the IPL should be rebuilt and transferred to target.

    Note, also recommend searching through the BSP for other references to DSP, and removing where applicable.

    Regards,

    kb