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DLPC3420: Controller not booting, DLP Technology Boot Diagnostic Tool shows no issues

Part Number: DLPC3420

Tool/software:

Hi, my controller keeps HOST_IRQ held high and I am unable to communicate with it over I2c.

However, the board, when flashed with the boot diagnostics tool, shows no issues (with serial communication over HOST_IRQ).  I am able to complete the initialisation and the program returns boot successful.
There is communication on both SPI lanes, and the PMIC boots properly with all voltages stable (1v1, 1v8, VOFS, VRST, VRST) and correct for the active 1 state.  DLPC_RESET is at 2.4v and DLPC_PARKZ is stable at 1.8v.

Any assisstance would be appreciated.

Thanks.