No write operation on ddr

I wrote a C program, and I ran this C program in a simulation environment, generating a waveform file. The function of this C program is to perform calculations on a number and then write it back. However, in the simulation waveform, I did not observe the execution of the write operation on the AXI port of the DDR. I tried many other C programs and observed the same behavior. Moreover, when a large amount of data is written back to the DDR in the program (for example, 32,768 int data), partial data writing back (but not all data) can be observed on the AXI port of the DDR. I wonder what is going on.

Additionally, can this CPU be used as a bare-metal CPU?

Start by reproducing the reported C program in the simulation environment and inspect the AXI DDR waveform for a small write and for 32,768 int writes. Compare the observed transactions with the expected write behavior, then document the cause of missing or partial writes and whether this CPU supports bare-metal use.