On 10/14/2021 10:18, Joel Sherrill wrote:
On Thu, Oct 14, 2021 at 9:56 AM Kinsey Moore <kinsey.mo...@oarcorp.com> wrote:
On 10/14/2021 01:40, Chris Johns wrote:
Hi,
I have come across this define in zynqmp_slcr.h:
#define ZYNQMP_DEFAULT_PS_CLK_FREQUENCY 33333333
What if the cpu freq is changed by a user? If this value still valid?
If CPU frequency scaling is used, I believe this value remains
unchanged. This is the base clock of the processing subsystem as a whole
which includes all hard peripherals.
The CPU frequency is under the control system designer in these parts.
That's correct, this frequency could theoretically be changed by using
different parts on the board, different dividers somewhere, or probably
even forcing the PL to somehow generate the clock. This clock value has
been the same for all 3 ZynqMP boards I have on hand.
If it can be changed by a user, should it be something that can be overridden
by configuration?
Yes, but it hasn't come up yet and so allowing for an override hasn't
been a priority. This might be one of those things that is best
configured in RTEMS since it's BSP-related configuration pertaining to a
device, but would appear to be dead code/configuration since nothing
there uses it.
Kinsey
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