No, Cortex A in an Arria10 SoC. The boot process is tedious because you have to load the FPGA before you can access the external RAM so the stage 1 bootloader has to fit 256KB code+data. Currently I'm using a multi-stage U-Boot but for simplicity and robustness I'd like to cram everything in a single stage loader.

Since I can't get u-boot to create a small enough image with all the features that I want (and also because I want to add vendor-specific customizations on top) I decided to try and rewrite a small, single purpose loader from scratch. I considered Rust but then that meant that I'd have to port or rewrite all of u-boot's code I want to reuse (especially the vendor code contributed by Altera mentioned in the previous post). So C it is.