Steven Scholz steven.scholz@imc-berlin.de schreibt:
this patch switches the at91rm9200 to synchronous clock mode after initialization (it would otherwise stay in FastBus mode which is the _slowest_ clock mode).
But I thought FastBus mode is the prefered setting for ARM cpus.
Hi Steven,
FastBus is the default after reset but is not intended for normal operation.
Quote from the ARM920T Technical Reference Manual (ARM DDI 0151C): "On reset, the ARM920T is put into FastBus mode and operates using BCLK. A typical use for FastBus mode is to execute startup code while configuring a PLL under software control to produce FCLK at a higher frequency. When the PLL has stabilized and locked, you can switch the ARM920T to synchronous or asynchronous clocking using FCLK for normal operation."
Cheers Anders