Hi Charlie,
Thank you for your interest in NXP Semiconductor products and the opportunity tor serve you.
1) What kind of RTOS has been test on LPC43S67, uC/OSII,FreeRTOS, any experience to share?
I'd like to recommend you to refer the LPCOpen library which contains some RTOS demos.
LPCOpen Software for LPC43XX|NXP
2) Where to get the A70CM Host API, so I can access A70CM for security related application?
As I know, if customer want to get A70 security support, they need signed a special NDA with NXP. This need check with A70 product line. Customer can check this with the distributor and you can learn the contacting information through the link below:
Distributor Network|NXP
Have a great day,
Ping
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