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BELK provides a bootable microSD that can be used not only to quickly start the system, but also as a recovery method in case the primary boot device (eg. QSPI NOR flash) gets erased or corrupted. The following sections describe how to create a bootable SD card and how to configure the system for booting from SD.[[Restoring_U-Boot_on_SPI_NOR_flash_(BELK/BXELK)|This article]], for example, shows how to make use of such a card to restore the U-Boot image onto the NOR flash. {{ImportantMessage|text=It is worth remembering that the bootable microSD card described in this article is not configured to perform a full boot sequence, including the operating system bootstrap. The bootable microSD card delivered along with the kit is set up to do a full bootstrap sequence, instead. For more details, please refer to [[Working_with_the_Yocto_build_system#bootscript|this section]].}} ==How to create a bootable MicroSD microSD card=====BELK <= 3.0.2 / BXELK <= 1.0.1===This section describes how to create a new bootable microSD card from scratchfor '''BELK <= 3.0.2''' and '''BXELK <= 1.0.1'''.

*in the ''Boot image partitions '' section, click on ''Add '' to browse and add the following files:**FSBL in .elf format, with ''bootloader'' as partition type “bootloader”**(optional) FPGA bitstream in .bit format, with partition type “datafile”''datafile''**U-boot binary with .elf extension, with partition type “datafile”''datafile''*in the ''Output path '' section, browse and select the path where saving the <code>boot.bin </code> file*on a PC, format the microSD card creating a FAT32 partition*copy the <code>boot.bin </code> file to the microSD card FAT32 partition. ==How =BELK-4.0.0 / BXELK-2.0.0===This section describes how to configure the system create a new bootable microSD card from scratch for SD '''BELK-4.0.0''' and '''BXELK-2.0.0'''.The following components must be available:*U-boot==SPL and U-boot second stage built as described in [[Building_U-Boot_(BELK)|here]]*FPGA bitstream (optional).The S5 dip-switch procedure is the following:*on a PC, format the BORAEVB carrier board is used for configuring the boot mode. Please refer to microSD card creating a FAT32 partition*copy the following table files to select the MicroSD mode microSD card FAT32 partition:** U-boot SPL: <code>boot.bin</code>** U-boot second stage: <code>u-boot.img</code>** Fpga bitstream .bit (highlighted in greenoptional):<code>fpga.bit</code>

{{ImportantMessage| class="wikitable" border="1"! align="center" rowspan="2"|Boot mode! align="center" colspan="8"|S5 dip switch positions|-| style="text-align:center;"|1||style="text-align:center;"|2||style="text-align:center;"|3||style="text-align:center;"|4||style="text-align:center;"|5||style="text-align:center;"|6||style="text-align:center;"|7||style="text-align:center;"|8|-| style="background-color: green;"|MicroSD||style="background-color: green;"|OFF||style="background-color: green;"|ON||style="background-color: green;"|OFF||style="background-color: green;"|ON||style="background-color: green;"|ON||style="background-color: green;"|OFF||style="background-color: green;"|ON||style="background-color: green;"|OFF|-| NOR SPI||OFF||ON||OFF||ON||ON||ON||ON||OFF|-| NAND||OFF||ON||OFF||ON||ON||OFF||ON|In case the microSD card provided along with the kit is used, the Programmable Logic is automatically programmed with the [[Creating_and_building_example_Vivado_project_(BELK/BXELK)|ONexample design]] during the boot process.|}}