Riscv-nezha
This page lists details about the Sipeed Nezha .
Hardware Info
General
As report by Linux Sunxi
| Device | Note |
|---|---|
| SOC | Allwinner D1 @1.0Ghz |
| DRAM | 512MiB/1GiB/2GiB DDR3 @ 792MHz, 2× H5TQ4G63EFR |
| NAND | 256MB, MX35LF2GE4AD |
| Power | DC 5V @ 2A (via OTG or dedicated USB Type-C connector) |
| Video | HDMI (Type A - full), LVDS |
| Audio | 3.5mm headphone plug, HDMI, microphone array board connector, I2S |
| Network | WiFi 802.11 b/g/n (XRadioTech XR829), 10/100/1000Mbps Ethernet (Realtek RTL8211F) |
| Storage | µSD, SPI NAND |
| USB | 1 USB2.0 Host, 1 USB Type-C OTG |
| Other | Power LED, RGB LED, OK & FEL buttons |
| Headers | 40-pin GPIO, DEBUG |
Serial Header
The Sipeed Nezha follows the Raspberry Pi line in terms of the pins for the serial header. The serial header pins are 5V power (pin 4), ground (pin 6), TXD (pin 8), and RXD (pin 10).
The following setting can be used to connect to the Sipeed Nezha. The serial terminal shall be enabled by default.
- Speed (baud rate): 115200
- Bits: 8
- Parity: None
- Stop Bits: 1
- Flow Control: None
Software Info
By default, Nezhas ship with Debian or a Debian-like operating system called [TinaLinux] on the SD card. A version of the operating system also exists in the device's NAND memory. Embedded Xinu will not overwrite the operating system in NAND, however the SD card will need to be overwritten to boot Embedded Xinu.
Nezhas ship with a version of U-Boot preinstalled. This version of U-Boot, however, does not support network booting. We recommended network booting as it doesn't require students to write their operating system the SD cards (which can wear them out). See here for more information on TFTP in a Xinu lab.
To install an updated version of U-Boot on the SD card:
1. Get the WIP U-Boot code for the Nezha
git clone https://github.com/smaeul/u-boot -b d1-wip pushd u-boot
2. Make the configuration file
make CROSS_COMPILE=riscv64-linux-gnu- nezha_defconfig
3. Make U-Boot
make CROSS_COMPILE=riscv64-linux-gnu-
4. Write U-Boot to SD card. Note, change "x" to the drive of the SD card.
sudo dd if=nboot/boot0_sdcard_sun20iw1p1.bin of=/dev/sdX bs=8192 seek=16 sudo dd if=nboot/boot0_sdcard_sun20iw1p1.bin of=/dev/sdX bs=8192 seek=256
5. The SD card shall now have the WIP version of U-Boot. Insert the SD-card back into the Nezha.
