No write operation on ddr

[xlgforever]

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?