====== Questions & Answers ======

===== How to install and boot firmware from eMMC memory? =====

This same image (file ''sdcard.img'') created by the Buildroot (see [[litesom:buildroot|Quick start]]) can be installed on liteSOM eMMC memory.

Below you can find list of steps required it install and boot liteSOM from eMMC memory:

  - build firmware as described on [[litesom:buildroot|Quick start]].
  - configure liteboard boot switches to "Boot from SD card" mode (see [[litesom:boot_switches|Liteboard boot switches configuration]]),
  - boot liteboard with firmware compiled in the first step,
  - copy to USB stick ''sdcard.img'' file generated in the first step,
  - insert USB stick to the liteboard USB A socket,
  - mount USB stick,
  - copy ''sdcard.img'' file to eMMC memory (''/dev/mmcblk1''),
  - configure liteboard boot switches to "Boot from eMMC memory" mode (see [[litesom:boot_switches|Liteboard boot switches configuration]]),

<button collapse="program-eMMC">Show steps 5…7</button> 
<collapse id="program-eMMC" collapsed="true"><well>

**Step no. 5**

<code>
[  166.513081] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[  166.755810] usb-storage 1-1:1.0: USB Mass Storage device detected
[  166.773805] scsi host0: usb-storage 1-1:1.0
[  167.853525] random: crng init done
[  167.876991] scsi 0:0:0:0: Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 2
[  167.906527] sd 0:0:0:0: [sda] 8212480 512-byte logical blocks: (4.20 GB/3.92 GiB)
[  167.915863] sd 0:0:0:0: [sda] Write Protect is off
[  167.924621] sd 0:0:0:0: [sda] No Caching mode page found
[  167.930288] sd 0:0:0:0: [sda] Assuming drive cache: write through
[  167.959291]  sda: sda1
[  167.975830] sd 0:0:0:0: [sda] Attached SCSI removable disk
</code>

**Step no. 6**

<code>
# mkdir /mnt/usb
# mount /dev/sda1 /mnt/usb/
</code>

**Step no. 7**

<code>
# dd if=/mnt/usb/sdcard.img  of=/dev/mmcblk1 bs=4M
21+0 records in
21+0 records out
# sync
</code>

</well>
</collapse>