Is it possible to develop ARM FPGA design start with Keil MDK Lite? FPGA design start includes 90-days trial of Keil MDK Essential. Is it really needed if the code doesn't exceed 32KB? Are there any other limitations to using Keil MDK Lite in this regard?
For building/debugging the Arm code, and if your code can work within MDK Lite restrictions, then it should be fine. The FPGA design will be done with FPGA tools as you mention.
MDK editions table is shown here.