litex/doc/BIOS.md

LiteX takes the philosophy of pushing as much onto the Soft CPU as possible. This means that most Gateware needs some accompanying code to initialize various settings and configurations. This specialized firmware is called the BIOS.

The BIOS generally does tasks like;

• Train any external DDR memory
• Load the user's Firmware into external memory via;
  • Communication channels like serial, tftp
  • Other storage systems like external flash.

This can make it very fast to do development as you can iterate on Firmware development quickly.