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?
You mean this https://www.xilinx.com/products/design-tools/embedded-software/sdk.html ?
You'd have to ask Xilinx for specific details of their particular offering.
That page doesn't mention what toolchain(s) is/are included - other than that the IDE is "Eclipse-based" - so not uVision. It could be GCC. That page doesn't mention Cortex-M or Keil at all
But it certainly is common that manufacturers have "special deals" for use with their products (and their products only).
eg, ST have a free Keil MDK for use with their Cortex-M0 chips, and Silicon Labs have a free full C51 for use with their 8051-based chips.