====== Flash QSPI firmware using U-Boot ======

How to flash the uboot, kernel and RootFS on qspi using u-boot commands

===== - Requirements =====
  * Running [[en:general_information:tftp|TFTP-Server]] with the following files:
    *  QSPI NOR image without rootf (uboot-*-qspi.img)
    *  ubi partition for QSPI NOR (root.ubi)

===== - Flash QSPI boot loader image =====

  - boot from SD-Card or eMMC and interrupt the boot process in U-Boot
  - Configure the network in uboot:
    * => setenv autoload no
    * => setenv serverip <serverip> (TFTP Server adress, e.g.: setenv serverip 192.168.100.110) 
    * => setenv ipaddr <ipaddr> (e.g.: setenv ipaddr 192.168.100.111)
    * => setenv netmask <netmask> (e.g.: setenv netmask 255.255.255.0)

  - Download boot loader image from tftp server<code>
=> tftp $loadaddr uboot-*-qspi.img 
</code>
  - Initialize QSPI<code>
=> sf probe 
</code> 
  - Write boot laoder image to QSPI<code>
=> sf update $loadaddr 0 $filesize
</code>
  - change the dip switch to boot from qspi

===== - Flash QSPI RootFS image =====
<WRAP round important 60%>
use these following commands only if the qspi has not yet been written and initialized to prevent the write counter from being overwritten
</WRAP>
  - Download RootFS image from tftp server<code>
=> tftp $loadaddr root.ubi
</code>
  - erase the qspi flash completely<code>
=> sf erase RootFS 3800000
</code>
  - write downloaded image to qspi<code>
sf write ${loadaddr} RootFS ${filesize}
</code>