A telephonic interview was scheduled first. After that they called me onsite for a F2F interview.

C and OS basics are mandatory. Computer architecture course from good university is a big plus. Work requires knowledge of ARM architecture and RTOS.

Task queuing in RTOS

Priority Inversion, how to avoid in RTOS

Interrupt handling and managing as top half and bottom half in RTOS

Concept of tasklets

Count no of set bits in a 32 bit no. You can't run the loop blindly for 32 times. it has to be dynamic

Reverse a string. Don't use a temporary variable for swapping

What are processes carried out in background if a file is opened by user

Concepts of IOCTL, system calls and handlers.

Function Pointers. Why they are useful in handlers.