1 The current implementation allows the user to specify the desired CPU
2 clock value, in MHz, via an environment variable "cpuclk".
4 Three compile-time constants are used:
6 CFG_866_OSCCLK - input quartz clock
7 CFG_866_CPUCLK_MIN - minimum allowed CPU clock
8 CFG_866_CPUCLK_MAX - maximum allowed CPU clock
9 CFG_866_CPUCLK_DEFAULT - default CPU clock value
11 If the "cpuclk" environment variable value is within the CPUCLK_MIN /
12 CPUCLK_MAX limits, the specified value is used. Otherwise, the
13 default CPU clock value is set.
15 Please note that for now the new clock-handling code has been enabled
16 for the TQM866M board only, even though it should be pretty much
17 common for other MPC859 / MPC866 based boards also. Our intention
18 here was to move in small steps and not to break the existing code