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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You might be interested in Precursor and the Betrusted Platform.
https://www.crowdsupply.com/sutajio-kosagi/precursor
They are trying to have an hardware platform that can be inspected and it is based on an FPGA with a RISC-V Softcore.
Its by Bunnie, and he great talks about the choices and why he made them:
Keynote: Precursor - Trustable Open Hardware for Everyday Use - Bunnie Huang (https://www.youtube.com/watch?v=Fw5FEuGRrLE)
They are also doing their own Rust Message passing OS called Xous that might be of interest.
https://github.com/betrusted-io/xous-core
I would think that the bootloader code wouldn't use any funky IP blocks - it's not some sort of driver code into which applications call, it's just a special application that runs before anything else. It has to be able to talk UART (or some other interface), check signatures, and write flash. All of these the user code can do as well.
There are many "user-space" bootloaders as well for various chips. The factory bootloader is only different in that it sits in ROM. For example, RP2040 ROM bootloader is here https://github.com/raspberrypi/pico-bootrom