title: Raspberry 5 baremetal detect board
keywords:raspi5,asm,c,kernel,arm64

# Raspberry 5 baremetal detect board

Baremetal code snippet on how to detect what raspi board you are running on

```c
int  get_raspi_board()
{
    unsigned int reg;
    int ret=0;

    /* read the system register */
#if __aarch64__
    asm volatile ("mrs %x0, midr_el1" : "=r" (reg));
#else
    asm volatile ("mrc p15,0,%0,c0,c0,0" : "=r" (reg));
#endif

    /* get the PartNum, detect board and MMIO base address */
    switch ((reg >> 4) & 0xFFF) {
        case 0xB76: 
        	ret=1;
        	break;
        case 0xC07: 
        	ret=2;
        	break;
        case 0xD03: 
        	ret=3; 
        	break;
        case 0xD08: 
        	ret=4; 
        	break;
        case 0xD0B:
        	ret=5;
        default: 
        	break;
    }
    return ret;
}

```

## Links

[1] https://wiki.osdev.org/Detecting_Raspberry_Pi_Board  
[2] [/writeup/raspberry5_baremetal_helloworld.md](/writeup/raspberry5_baremetal_helloworld.md)  
[3] https://github.com/DSERIOUSGUY/HobOS/blob/main/mmio.c