1. CRTM 和 SRTM的不同点。

A power-on reset creates an environment in which the platform is in a known initial
state, with the main CPU running code from some well-defined initial location. Since
that code has exclusive control of the platform at that time, it may make measurements 
of the platform from firmware. From these initial measurements, a chain of trust may 
be established. Because this chain of trust is created once when the platform is reset,
no change of the initial trust state is possible, so it is called a static RTM (S-RTM).

An alternative method of initializing the platform is available on some processor 
architectures. It lets the CPU act as the CRTM and apply protections to portions of memory
it measures. This process lets a new chain of trust start without rebooting the platform. 
Because the RTM may be re-established dynamically, this method is called dynamic RTM (D-RTM).
Both S-RTM and D-RTM may take a system in an unknown state and return it to a known state.
The D-RTM has the advantage of not requiring the system to be rebooted.

这是从TPM文档中摘出的一句话。大体意思是SRTM是静态的，每次要建立可信链必须重启，而CRTM是动态的，可以不reboot重建可信链