5.6 Booting Up the Board

After flashing, insert the SD card into the microSD card slot.

Connect Micro USB cable to the j10 port. In the Linux host machine, it will enumerate as /dev/ttyACM0.

Open minicom and set up the settings.

Press the Reset button on the board.

This time, the board will start to boot up. Interrupt at the U-Boot timeout to make changes to the U-Boot environment variables.

Modify the two variables as shown:

bootargs: Change the mmcblk0p2 to mmcblk1p2 by using the following command:
```
=> edit bootargs
```
Edit the response and change mmcblk0p2 to mmcblk1p2 by using the following command:
```
edit: console=ttyS0,115200 root=/dev/mmcblk1p2 rw rootwait rootfstype=ext4 atmel.pm_modes=standby,ulp1
```
bootcmd_boot: Change mmc 0:1 to mmc 1:1 by using the following command:
```
=> edit bootcmd_boot
```
Edit the response and change mmc 0:1 to mmc 1:1 by using the following command:
```
edit: fatload mmc 1:1 ${loadaddr} ${board_name}.itb; bootm ${loadaddr}#kernel_dtb${at91_overlays_config};
```
Save the environment by using the following command:
```
=> saveenv
```
The following is the reply displayed after executing the => saveenv command:
```
Saving Environment to FAT... OK boot
```
Boot the board by using the following command:
```
=> boot
```
Note: For reference, see the following image: