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Standalone boot (BELK/BXELK)

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|1.0.0

|December 2016

|~~[[BELK/BXELK_software_components#BELK_3.0.1_.2F_BXELK_1~~|||2.0.0|March 2019|~~BXELK 1.0.0]]~~TBD

|DBXF4110D2R<br />EVBBX0000C0R

|

== Introduction ==

This document shows some examples related to configuring Bora/BoraX for standalone operativity.

~~This document has been written~~ We'll explain how to program and ~~tested with the software/hardware combination described~~ configure a [[Category:BoraX|BoraX]] to boot in standalone mode, without the ~~history table above~~need of a system microSD card or an NFS server. ~~However it contains general concept that can~~ Only the flash memories available on the SoM itself will be ~~adapted on any DAVE Embedded Systems' Linux platform~~used to store persistently all the software required.

~~We'll explain how to program and configure a [[Category:BoraX|BoraX]] to boot in standalone mode, without the need of a system microSD card or a NFS server, with two options:~~

* booting with NOR + NAND

** U-Boot will fetch and program PL bitstream and then fetch Linux kernel binary images (kernel + device tree) from on-board NOR flash memory, while later the OS will mount the root file system from a NAND partition.

==Use case #1==

This configuration makes use of one of the most common partitioning schemes, that is:

*The NOR flash acts as boot memory; as such, it contains

**U-Boot SPL

**U-Boot

**U-Boot redundant environment

**Linux kernel image

**Linux Device Tree Blob (DTB)

*The NAND flash contains the UBIFS root filesystem (read/write).

In essence, the bootstrap sequence looks like this:

*U-Boot fetches and programs the PL bitstream

*Then it fetches the Linux kernel binary images (kernel and DTB) from the on-board NOR flash memory

*Once started, the Linux kernel mount the root filesystem from a NAND partition.

This configuration was tested with the following testbed:

*SOM: DBXF4110D2R

*carrier board: EVBBX0000C0R

*software: [[BELK/BXELK_software_components#BELK_3.0.1_.2F_BXELK_1.0.0|BXELK 1.0.0]]

=== Program root file system in NAND flash ===

</pre>

{{ImportantMessage|text=Please note that MTD partition index may change depending of on flash device availability, flash device size, u-boot environment variables or kernel device driver load order. Always take care of looking inside <code>/proc/mtd</code> to match your specific layout}}

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Standalone boot (BELK/BXELK)

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