Parts of DRAM, USB, and GPIO controllers at least are probably going to stay closed for the short term. The analog properties of their PHYs are per process hard blocks typically that the fabs are super into keeping locked up.
I2C and SPI are pretty trivial though, I've written HDL for both of those. SPI is literally just a shift register and an chip enable signal.
I2C and SPI are pretty trivial though, I've written HDL for both of those. SPI is literally just a shift register and an chip enable signal.