I’m not sure if this is a new change, but I just noticed that the Intel System Debugger appears to have some fresh documentation:

https://software.intel.com/node/744419

Common Debugger Tasks
* Viewing and Modifying Registers
* Execution Trace
* Debugging UEFI BIOS
* Debugging Runtime Loaded Linux* OS Kernel Modules
* Debugging System Management Mode (SMM)
* Programming a Flash Memory