I am now trying to observe the clock of the HiFive Unleashed core with an oscilloscope. I have read the datasheet (schematics) and the user manual, but there doesn’t seem to be any such port.
I have tried the following ports, but to no avail.
- CHIPLINK_TX_CLK (FMC connector)
- SPI0_SCLK (GPIO pinout)
- TCLK (JTAG connector pinout)
In addition, I also tried the following to check the operating frequency from Linux, but it did not work.
The software I am using is Keystone Enclave v1.0.0 (OpenSBI v0.8, Linux 5.7.0, Buildroot 2020.11).
Any method that involves HW modification (soldering) or checking the clock frequency from Linux is appreciated.