sdcard.md

Prepare SD card

First make sure you save all the files currently in the card.

In this example the sdcard is /dev/mmcblk0 and the partitions are /dev/mmcblk0p1, /dev/mmcblk0p2, etc. Other common names might be TODO.

i) Make sure all partitions are unmounted

umount /dev/mmcblk0*

ii) Delete all partitions

sudo fdisk /dev/mmcblk0

Then run the commands:

• Press d until there are no more partitions (if it asks you for the partition, press return for the default)
• Press w write changes and exit

iii) Create partition

sudo fdisk /dev/mmcblk0

Then run the commands:

• o to create a new empty DOS partition table
• n to create a new partition. Select the following options:
  • p to make it a primary partition
  • the automatically assigned partition number by pressing return
  • 16384 (this gap is needed for some of the selected boards)
  • the max default size by pressing return
  • if it asks you to remove the file system signature press y
• a to make the partition bootable
• t to set the partition type:
  • type c for W95 FAT32 (LBA)
• w to write changes and exit

iv) Format partition

Format the created partition to a fat filesystem:

sudo mkfs.fat /dev/mmcblk0p1 -n boot

Remove and insert the sd card to automatically mount it. Setup an environment variable to the mount path:

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NOTE

This guide expects for the sd card mount point to be at /media/$USER/boot.

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Setup environment variables pointing to the sd card device, partition and mount point, which in our example are:

export BAO_DEMOS_SDCARD_DEV=/dev/mmcblk0
export BAO_DEMOS_SDCARD=/media/$USER/boot