CoreMark Bare-metal RISC-V

Bare-metal CoreMark performance benchmark with configurable UART baud rate support.

Features

• Removed syscalls for bare-metal implementation
• Integrated sifive uart library for serial output
• Configurable UART baud rates (9600/115200/38400/57600)
• Support P2E platform

Project Structure

coremark_att/
├── coremark/               # CoreMark source code
│   ├── core_main.c        # Main benchmark logic
│   ├── core_list_join.c   # List operations
│   └── core_matrix.c      # Matrix operations
├── riscv64-baremetal/     # RISC-V bare-metal port
│   ├── include/
│   │   ├── platform.h     # Hardware platform definitions
│   │   ├── uart_config.h  # UART baud rate configuration
│   │   └── devices/uart.h # SiFive UART register definitions
│   ├── syscalls.c         # System calls and UART initialization
│   ├── kprintf.c          # Printf implementation
│   └── Makefile           # Build configuration
└── README.md

Build & Run

# Build
cd coremark/
make PORT_DIR=../riscv64-baremetal compile

# Convert to big-endian hex for P2E platform backdoor DDR
python3 hex_to_readmemh.py ./coremark/coremark.bare.riscv cm_bigendianv3.hex --big-endian --remap-to-zero

# Clean
make PORT_DIR=../riscv64-baremetal clean

P2E Platform Support

The P2E platform backdoor DDR requires big-endian hex files. e.g., Use the conversion script:

• Input: coremark.bare.riscv
• Output: cm_bigendian.hex
• flags: --big-endian --remap-to-zero

UART Baud Rate Configuration

Modify UART initialization in riscv64-baremetal/syscalls.c:

// Default (TX enable only)
REG32(uart, UART_REG_TXCTRL) = UART_TXEN;

// Configure specific baud rate (replace above line)
uart_init_9600();     // 9600 baud
uart_init_115200();   // 115200 baud  
uart_init_38400();    // 38400 baud
uart_init_57600();    // 57600 baud

Specifications

• Architecture: RISC-V 64-bit
• UART Base: 0x64000000
• Clock Frequency: 100MHz
• Optimization: -O2
• Output: coremark.bare.riscv

Program Flow

1. Initialize UART with configured baud rate
2. Output startup information
3. Execute CoreMark benchmark
4. Display performance results
5. Enter WFI (Wait For Interrupt)

Baud Rate Calculation

Divisor = Clock_Frequency / Baud_Rate
        = 100,000,000 / Baud_Rate