Honored ContributorIn SOPCBuilder, there's a choice of the clock frequency for NIOSII Processor component.
And in the uclinux, I believe there are also alternate option locates in the .c file. I don't know how to change the cpu working frequency of uclinux? cat /proc/cpuinfo there's only half of the highest freq of cpu.
Honored ContributorDo you want to dynamically change the CPU frequency ?
That is an interesting issue. (Especially for implementing a power saving mode.) I don't suppose this is provided by the NIOS SOPC module. But I suppose the clock for the CPU can be taken from any source within the FPGA and thus you should be able to implement some hardware for a variable clock source module using HDL code (e.g. changing the divide factor of a PLL) . Same could be an Avalon bus slave. Now you would need to do a kernel driver that writes to the clock hardware and as Linux does have a Power management subsystem, if done correctly same could access your Kernel driver to do the standard (e.g. Laptop-like) clock frequency handling for power saving On the long run I do plan for something like this, too. -MichaelHonored Contributor<div class='quotetop'>QUOTE (mschnell @ Aug 14 2009, 03:05 AM) <{post_snapback}> (index.php?act=findpost&pid=23508)</div>
--- Quote Start --- Do you want to dynamically change the CPU frequency ? That is an interesting issue. (Especially for implementing a power saving mode.) I don't suppose this is provided by the NIOS SOPC module. But I suppose the clock for the CPU can be taken from any source within the FPGA and thus you should be able to implement some hardware for a variable clock source module using HDL code (e.g. changing the divide factor of a PLL) . Same could be an Avalon bus slave. Now you would need to do a kernel driver that writes to the clock hardware and as Linux does have a Power management subsystem, if done correctly same could access your Kernel driver to do the standard (e.g. Laptop-like) clock frequency handling for power saving On the long run I do plan for something like this, too. -Michael[/b] --- Quote End --- I believe it's a very interesting process to change the frequency,too. I will gather more knowledge in the following semester, and enjoy the next amazing semester in my life.
