I'm currently working on a project where I don't need that much computational power and where I have to reduce power consumption as much as possible.
I've played around with clock rate changes for CPU, HSB, PBA and PBB during the last days.
I plan to use the following configuration:
CPU: 60MHz, HSB: 30MHz, PBA: 15MHz, PBB: 30MHz
The system runs stable with this setup when I boot via NFS.
But when booting from internal FLASH, I get JFFS2 file system errors during the boot process.
These errors occur as soon as the HSB frequency goes below the standard 70 MHz.
I suspect a FLASH timing setup problem.
Does anybody have an idea? Are there clock rate related dependencies in the FLASH or JFFS2 configuration that I have to adjust?
I use Buildroot 2.3.0 and kernel 188.8.131.52.