The initial stack pointer (read from address 0x0) points above c31bootbin top . Fix: Edit the bootbin header using a hex editor. Change the first 4 bytes to a valid SRAM top address (e.g., 0x0000F000 for 60KB SRAM). Recalculate any CRC.
To understand "c31bootbin top," we must split it into its constituent parts: c31bootbin top