run_on_visionfive2.md

How to run on Visionfive 2

Pre-requirement:

1. Build VIMIX (see build_instructions), make sure PLATFORM in MakefileArch.mk is set to visionfive2.
2. Connect the Visionfive 2 board to UART.
3. Start a UART terminal on the host PC (e.g. picocom)

Hardware Setup

Connect a UART-to-USB adapter to the 40 pin GPIO header: When looking at the board in "portrait mode" with the USB/Ethernet/HDMI ports on the left, the GPIO header is on the top right.

LEFT	RIGTH
3.3V	5V
I2C SDA	5V
I2C SCL	GND	To GND on UART
GPIO 55	UART TX	To RX on UART
GND	UART RX	To TX on UART
GPIO 42	GPIO 38
14 more pins	14 more pins

See https://wiki.52pi.com/index.php?title=ER-0043 for more details.

Console Emulator

Start a console emulator:

minicom -D /dev/ttyUSB0 -b 115200

or:

picocom -b 115200 -r -l /dev/ttyUSB0

To upload data via UART use picocom:

picocom -b 115200 -r -l /dev/ttyUSB0 --send-cmd "lrzsz-sx --ymodem"

Loading VIMIX

Boot the Visionfive 2 board and stop the default boot sequence. The commands below are U-Boot commands to load the VIMIX binary.

The memory starts at 0x40000000, the firmware is also mapped here. The usable memory (and where the kernel gets mapped to) starts at 0x40200000. Before bootelf loads the kernel to that address, the elf file has to be loaded into some higher memory location. 0x50000000 works fine.

From UART

StarFive # loady 0x50000000

CTRL+A CTRL+S:

StarFive # ./vimix_os/build/kernel-vimix
StarFive # bootelf 0x50000000

From SD Card

Copy build/kernel-vimix to the root of the SD card. Reboot the board after inserting the SD card.

StarFive # load mmc 1 0x50000000 kernel-vimix
StarFive # bootelf 0x50000000

U-Boot commands can be concatenated:

load mmc 1 0x50000000 kernel-vimix && bootelf 0x50000000

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