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board/riscv64: add README for the VisionFive2 board

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
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Joachim Wiberg
2024-08-08 13:35:27 +02:00
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board/riscv64/visionfive2/README.md
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Starfive VisionFive2
====================
The [VisionFive2][1] is a low-cost RISC-V 64-bit based platform, powered
by the Starfive JH7110 processor.
Infix runs from either SD card or eMMC, this guide only covers SD card.
How to Build
------------
```
$ make visionfive2_defconfig
$ make
```
Once the build has finished you will have `output/images/sdcard.img`
which you can flash to an SD card.
```
$ sudo dd if=output/images/sdcard.img of=/dev/mmcblk0 bs=1M status=progress oflag=direct
```
> **WARNING:** ensure `/dev/mmcblk0` really is the correct device for
> your SD card, and not used by the system!
Bootstrap Mode
--------------
Ensure the correct [bootstrap mode][3] for booting from SD card. From
factory the board is preset to start from QSPI flash, which also has a
U-Boot that tries to load a Linux system from SD card, or fail-over to
load from the network.
| **Mode** | **`RGPIO_1`** | **`RGPIO_0`** |
|----------|---------------|---------------|
| QSPI NOR | 0 (L) | 0 (L) |
| SD card | 0 (L) | 1 (H) |
| eMMC | 1 (H) | 0 (L) |
| UART | 1 (H) | 1 (H) |
> **Note:** the DIP switches are flipped 180° so don't get confused by
> the socket's `ON` label. Look at the L and H markings on the board!
Booting the Board
-----------------
1. Connect a TTL UART cable to pin 6 (GND), 8 (TX) and 10 (RX)
2. Insert your SD card
3. Power-up the board using an USB-C cable
You need a *stable power source*! If you get the following on the
console at power on, try to power cycle the device again:
```
dwmci_s: Response Timeout.
dwmci_s: Response Timeout.
BOOT fail,Error is 0xffffffff
```
[1]: https://doc-en.rvspace.org/Doc_Center/visionfive_2.html
[2]: https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/recovering_bootloader%20-%20vf2.html
[3]: https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/boot_mode_settings.html