21. Assorted technical topics

21.1. The FreeBSD Booting Process

21.1.1. Loading a kernel

21.1.2. Determine the root filesystem

21.1.3. Initialize user-land things

21.1.4. Interesting combinations

21.2. PC memory utilization

21.3. DMA: What it is and how it works

21.3.1. A Sample DMA transfer

21.3.2. DMA Page Registers and 16Meg address space limitations

21.3.3. DMA Operational Modes and Settings

21.3.4. Programming the DMA

21.3.5. DMA Port Map