View source for Recovering the Bootloader for STAR64 JH7710 over serial using screen

{{Under construction}}

== STAR64 serial wiring ==
Connect a USB to serial converter cable with 3.3&nbsp;V TTL levels to your STAR64 to the pins 4 (GND), 6 (TXD) and 8 (RXD).

Avoid the pins below pin 6; those are 5&nbsp;V which is enough to mess up most serial cables.

[[File:STAR64-serial-pins.jpg|400px|thumb|left|Serial pins on the STAR64 I/O connector]]

<div style="clear: both"></div>
== Recovering the Bootloader for STAR64 JH7710 over serial using screen ==
<syntaxhighlight lang="sh">
cd <path-to-directory-with-Tools>
screen -m -S star64 /dev/ttyUSB0 115200
# open a second shell
screen -S star64 -X exec \!\! sx Tools/recovery/jh7110-recovery-20230322.bin
# type 0 in the first shell
screen -S star64 -X exec \!\! sx u-boot/spl/u-boot-spl.bin.normal.out # file created with: ../Tools/spl_tool/spl_tool -c -f spl/u-boot-spl.bin
# type 2 in the first shell
screen -S star64 -X exec \!\! sx u-boot/u-boot.itb # file created with: tools/mkimage -f ../Tools/uboot_its/visionfive2-uboot-fit-image.its -A riscv -O u-boot -T firmware u-boot.itb
</syntaxhighlight>

== Backup current SPI ==
=== Using Linux ===
Execute the commands on the star64 (takes some time):
<syntaxhighlight lang="sh">
dd if=/dev/mtd0 of=/tmp/star64-factory-spl.bin
dd if=/dev/mtd1 of=/tmp/star64-factory-uboot.bin
dd if=/dev/mtd2 of=/tmp/star64-factory-data.bin
</syntaxhighlight>

Execute on you host:
<syntaxhighlight lang="sh">
rsync ${MNAME}:'/tmp/star64-factory-*' .
</syntaxhighlight>

== References ==
* [https://github.com/starfive-tech/Tools/blob/master/README.md#recovery Tools README.md about recovery]
* [https://doc-en.rvspace.org/VisionFive2/PDF/VisionFive2_QSG.pdf#page=40 VisionFive 2 Single Board Computer Quick Start Guide: 4.4. Recovering the Bootloader p. 40]
* [https://doc-en.rvspace.org/VisionFive2/PDF/VisionFive2_SDK_QSG.pdf#page=19 VisionFive 2 SDK Quick Start Guide: 7.4. Recovering the Bootloader p. 19]

[[Category:STAR64]]