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==Booting from NAND flash==
{{ImportantMessage|text=The following procedure is only theoretical. Boot firmware (U-Boot and SPL) for NAND storage are not available from the DAVE Embedded Systems' mirrors.}}
With respect to the NOR flash memories, NAND devices are known to be quite challenging with regard to the reliability. This is especially true when the NAND flash is used as the boot device. Several techniques such as wear leveling and bad block management have to be implemented to achieve an acceptable reliability.
Even though the example shown here refers to an i.MX6 UltraLite board, the approach is substantially the same across all the i.MX6 family.
The test bed used in this example consists of an i.MX6 UltraLite board equipped with a 128MB 8-bit asynchronous 1-bit ECC SLC NAND memory which is connected to the EIM bus of the SoC. The boot firmware image is the U-Boot binary files (<code>desk-mx6ul-l-34.0.0_mx6uldesk_axelulite_nand_SPL</code> and <code>desk-mx6ul-l-34.0.0_mx6uldesk_axelulite_nand_u-boot.img</code>). Its size is about 44 kB and 592 kB. From the point of view of MTD partitions, the boot partition for SPL is <code>mtd0</code> is 2MB while the second stage partition <code>mtd1</code> is 6MB.
===Boot partition organization===
*The second copy of the firmware.
For more details about the bootrom e and the NAND boot process, please refer to the ''System Boot'' chapter of the Reference Manual of the specific i.MX6 Application Processor.
The following section will describe how to burn the boot partition in practice.
<pre class="workstation-terminal">
root@desk-mx6ul-axelulite:~# kobs-ng -x -v -w desk-mx6ul-l-34.0.0_mx6uldesk_axelulite_nand_SPL
MTD CONFIG:
chip_0_device_path = "/dev/mtd0"
root@desk-mx6ul-axelulite:~# flash_erase /dev/mtd1 0 0
Erasing 128 Kibyte @ 5e0000 -- 100 % complete
root@desk-mx6ul-axelulite:~# nandwrite -p /dev/mtd1 desk-mx6ul-l-34.0.0_mx6uldesk_axelulite_nand_u-boot.img
Writing data to block 0 at offset 0x0
Writing data to block 1 at offset 0x20000