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==Restoring U-Boot on SPI NOR flash==
This article describes how to restore U-Boot on SPI NOR flash in case it gets corrupted or it is deleted accidentally.
===Instructions===
First of all, create a bootable microSD card as described [[DESK-XZ7-L/DeploymentDevelopment/Standalone_bootCreating_and_building_the_Petalinux_project#Program_boot_images_into_SD_cardPetalinux_build |here]].
Then, boot the board with the microSD card and stop the automatic boot process of U-Boot in order to access the console.
<pre class="workstation-terminal">
U-Boot 2021.01-desk-xz7-l-1.0.01 (Oct Jan 12 2021 2024 - 0910:2844:42 15 +0000)
CPU: Zynq 7z0207z030
Silicon: v3.1
Model: Bora
DRAM: ECC disabled 1 GiB
Flash: 0 Bytes
Out: serial@e0001000
Err: serial@e0001000
SF: Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiB
SF: Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiB
SOM ConfigID#: 00000004
SOM UniqueID#: 2a0e92c4:03193a4b
CB ConfigID#: ffffffff
CB UniqueID#: ffffffff:ffffffff
SF: Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiB
Warning: MAC addr not found in SPI NOR at block 8
Net:
ZYNQ GEM: e000b000, mdio bus e000b000, phyaddr -17, interface rgmii-id Warning: ethernet@e000b000 (eth0) using random MAC address - 72:2c:e1:44:08:28
eth0: ethernet@e000b000
Hit any key ENTER within 2 seconds to stop autoboot: 0
Zynq>
</pre>
====Programming U-Boot SPI NOR flash from ethernetuSD====* Initialize and format QSPINOR memory <pre class="workstation-terminal">Zynq> sf probeProperly define the ethernet configuration parameterSF:Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiBZynq> sf erase 0 0x1000000SF: 16777216 bytes @ 0x0 Erased: OK</pre> * Install <code>BOOT.BIN</code> on QSPINOR memory
<pre class="workstation-terminal">
Zynq> setenv ipaddr 192fatload mmc 0:1 $kernel_addr_r BOOT.168BIN7033004 bytes read in 406 ms (16.0.905 MiB/s)Zynq> setenv serverip 192.168.sf write $kernel_addr_r 0x0 $filesizedevice 0.23offset 0x0, size 0x6b50acSF: 7033004 bytes @ 0x0 Written: OK
</pre>
* download via TFTP the Install <code>BOOTimage.BINub</code> binary image. Then, burn them in NOR flash on QSPINOR memory:
<pre class="workstation-terminal">
Zynq> mw $kernel_addr_r 0x0 $filesizeZynq> fatload mmc 0:1 $kernel_addr_r image.ub4868556 bytes read in 287 ms (16.2 MiB/s)Zynq> sf write $kernel_addr_r 0x700000 $filesizedevice 0 offset 0x700000, size 0x4a49ccSF: 4868556 bytes @ 0x700000 Written: OK</pre> * Install <code>boot.scr</code> on QSPINOR memory <pre class="workstation-terminal">Zynq> mw $kernel_addr_r 0x0 $filesizeZynq> fatload mmc 0:1 $kernel_addr_r boot.scr2709 bytes read in 14 ms (188.5 KiB/s)Zynq> sf write $kernel_addr_r 0xFC0000 $filesizedevice 0 offset 0xfc0000, size 0xa95SF: 2709 bytes @ 0xfc0000 Written: OK</pre> ====Programming SPI NOR flash from ethernet====* Initialize and format QSPINOR memory <pre class="workstation-terminal">Zynq> sf probeSF: Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiBZynq> sf erase 0 0x1000000SF: 16777216 bytes @ 0x0 Erased: OK</pre> * Properly define the ethernet configuration parameter:<pre class="workstation-terminal">Zynq> setenv boot_addr_r 0x1000000ipaddr 192.168.0.89Zynq> setenv serverip 192.168.0.99</pre> * download via TFTP the <code>BOOT.BIN</code> binary image and write <code>BOOT.BIN</code> on QSPINOR memory<pre class="workstation-terminal">Zynq> tftpboot ${boot_addr_r} kernel_addr_r desk-xz7-l/BOOTdesk-xz7-l-1.0.1_borax_BOOT.BIN
Using ethernet@e000b000 device
TFTP from server 192.168.0.2399; our IP address is 192.168.0.9089Filename 'desk-xz7-l/BOOTdesk-xz7-l-1.0.1_borax_BOOT.BIN'.ERROR: reserving fdt memory region failed (addr=3e000000 size=1000000)Load address: 0x10000000x2000000Loading: #T ################################################################... ################################################################# ... ################################################################# 1######### 444.7 MiB3 KiB/s
done
Bytes transferred = 22149396 7033004 (151f914 6b50ac hex)Zynq> sf write $kernel_addr_r 0x0 $filesizedevice 0 offset 0x0, size 0x6b50acSF: 7033004 bytes @ 0x0 Written: OK</pre>
* download via TFTP the <code>image.ub</code> binary image and write <code>image.ub</code> on QSPINOR memory
<pre class="workstation-terminal">
Zynq> mw $kernel_addr_r 0x0 $filesize
Zynq> tftpboot $kernel_addr_r desk-xz7-l/desk-xz7-l-1.0.1_borax_image.ub
Using ethernet@e000b000 device
TFTP from server 192.168.0.99; our IP address is 192.168.0.89
Filename 'desk-xz7-l/desk-xz7-l-1.0.1_borax_image.ub'.
Load address: 0x2000000
Loading: #T ################################################################
#################################################################
...
#################################################################
#########################################
394.5 KiB/s
done
Bytes transferred = 4868556 (4a49cc hex)
Zynq> sf write $kernel_addr_r 0x700000 $filesize
device 0 offset 0x700000, size 0x4a49cc
SF: 4868556 bytes @ 0x700000 Written: OK
</pre>
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