diff options
author | wdenk <wdenk> | 2004-01-29 09:22:58 +0000 |
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committer | wdenk <wdenk> | 2004-01-29 09:22:58 +0000 |
commit | 6876609446980c3055bbd32c195a63330e21d8e6 (patch) | |
tree | b01a5dcb24de0cc0a020b142986eb64287f39422 /doc/README.MPC866 | |
parent | c178d3da6f1ac765cd880530a0672540b415a01c (diff) |
* Implement adaptive SDRAM timing configuration based on actual CPU
clock frequency for INCA-IP; fix problem with board hanging when
switching from 150MHz to 100MHz
* Add PCMCIA CS support for BMS2003 board
Diffstat (limited to 'doc/README.MPC866')
-rw-r--r-- | doc/README.MPC866 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/doc/README.MPC866 b/doc/README.MPC866 new file mode 100644 index 0000000000..1464a408ca --- /dev/null +++ b/doc/README.MPC866 @@ -0,0 +1,19 @@ +The current implementation allows the user to specify the desired CPU +clock value, in MHz, via an environment variable "cpuclk". + +Three compile-time constants are used: + + CFG_866_OSCCLK - input quartz clock + CFG_866_CPUCLK_MIN - minimum allowed CPU clock + CFG_866_CPUCLK_MAX - maximum allowed CPU clock + CFG_866_CPUCLK_DEFAULT - default CPU clock value + +If the "cpuclk" environment variable value is within the CPUCLK_MIN / +CPUCLK_MAX limits, the specified value is used. Otherwise, the +default CPU clock value is set. + +Please note that for now the new clock-handling code has been enabled +for the TQM866M board only, even though it should be pretty much +common for other MPC859 / MPC866 based boards also. Our intention +here was to move in small steps and not to break the existing code +for other boards. |