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authorwdenk <wdenk>2004-01-29 09:22:58 +0000
committerwdenk <wdenk>2004-01-29 09:22:58 +0000
commit6876609446980c3055bbd32c195a63330e21d8e6 (patch)
treeb01a5dcb24de0cc0a020b142986eb64287f39422 /doc
parentc178d3da6f1ac765cd880530a0672540b415a01c (diff)
* Implement adaptive SDRAM timing configuration based on actual CPULABEL_2004_01_29_1030
clock frequency for INCA-IP; fix problem with board hanging when switching from 150MHz to 100MHz * Add PCMCIA CS support for BMS2003 board
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+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.