Architectures/RISC-V/Allwinner

Nezha is a SBC based on Allwinner D1. This is a placeholder page to collect all information about running Fedora on Nezha.

Simple HOWTO

Prebuild Image

we have made the prebuild Fedora Image for Allwinner D1: Fedora-riscv64-d1-developer-xfce-with-esp-Rawhide-20210723-173234.n.0-sda.raw.zst

For booting it on D1, what you need to do just:

Decompress

unzstd  Fedora-riscv64-d1-developer-xfce-with-esp-Rawhide-20210723-173234.n.0-sda.raw.zst`

Flash into a SD card (>= 16GB)

sudo dd if=Fedora-riscv64-d1-developer-xfce-with-esp-Rawhide-20210723-173234.n.0-sda.raw of=/dev/sdX status=progress

insert the SD card and power up

• default display is LCD (vertical):

• (optional) switch display to HDMI (1080p mode, vertical)

cd /sys/kernel/debug/dispdbg
echo disp0 > name; echo switch1 > command; echo 4 10 0 0 0x4 0x101 0 0 0 8 > param; echo 1 > start;

Hardware info

IP info

T-Head: XuanTie C906 RISC-V

Soc & Development boardinfo

Allwinner: D1 SoC Introduction

Sunxi: D1

Sunxi: Allwinner Nezha

Software

Original source code

Allwinner: Allwinner Customer Service Platform Portal
You need to register and login.

Or you can download then from SUNXI website

FYI: Smaeul's REPO

• SPL/BOOT0

• OpenSBI

• U-Boot

• Linux kernel

Tekkaman REPO for Fedora Image

Firmware Build order

SPL(Boot0)

boot0 or SPL (Secondary Program Loader) which the first stage after BootROM, it is responsible for initializing DRAM and loading next stage firmware from storage(Flash or SD).

Using Smaeul SPL directly.

Build binary

git clone https://github.com/smaeul/sun20i_d1_spl
pushd sun20i_d1_spl
git checkout origin/mainline
make CROSS_COMPILE=riscv64-linux-gnu- p=sun20iw1p1 mmc
popd

Flash to SD card

pushd sun20i_d1_spl
sudo dd if=nboot/boot0_sdcard_sun20iw1p1.bin of=/dev/sdX bs=512 seek=16

OpenSBI

RISC-V Open Source Supervisor Binary Interface, like arm-TF

Using Smaeul's patches, but rebase to the latest upstream OpenSBI, and fix some issue.

Tekkaman's OpenSBI REPO

Build binary

git clone https://github.com/tekkamanninja/opensbi -b allwinner_d1
pushd opensbi
CROSS_COMPILE=riscv64-linux-gnu- PLATFORM=generic FW_PIC=y make
popd

The build/platform/generic/firmware/fw_dynamic.bin will be used to make u-boot.toc1 below.

U-boot

Using Smaeul's patches, but enable more features and add some default env for auto-booting into GRUB, and also rebase to the latest upstream U-boot.

Tekkaman's U-boot REPO

Build binary

git clone https://github.com/tekkamanninja/u-boot -b allwinner_d1
pushd u-boot
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv nezha_defconfig
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv menuconfig
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv u-boot.bin u-boot.dtb
popd

The u-boot.bin and u-boot.dtb will be used to make u-boot.toc1 below.

Build u-boot.toc1

• toc1.cfg:

[opensbi]
file = fw_dynamic.bin
addr = 0x40000000
[dtb]
file = u-boot.dtb
addr = 0x44000000
[u-boot]
file = u-boot.bin
addr = 0x4a000000

• build command:

pushd u-boot
cp ${PATH_TO_TOC1_CFG}/toc1.cfg ${PATH_TO_OPENSBI}/fw_dynamic.bin .
tools/mkimage -T sunxi_toc1 -d toc1.cfg  u-boot.toc1
popd

Flash u-boot.toc1 to SD card

pushd u-boot
sudo dd if=u-boot.toc1 of=/dev/sdX bs=512 seek=32800

GRUB for RISC-V

Please reference to this page: Architectures/RISC-V/GRUB2

You can build a grubriscv64.efi by following the page above. Then put it into the /EFI/ dir of the EFI partition of SD card.

Some example files in the boot partition:

/boot/uEnv.txt

bootcmd=load mmc 0:2 0x58000000 /EFI/fedora/grubriscv64.efi; bootefi 0x58000000
bootcmd_mmc0=devnum=0; run mmc_boot

/grub.cfg

set default=0
set timeout_style=menu
set timeout=3

set debug="linux,loader,mm"
set term="vt100"

menuentry 'Fedora vmlinux-5.15.0-rc1' {
        linux /vmlinuz-5.15.0-rc1 earlyprintk=sunxi-uart,0x02500000 console=ttyS0,115200 console=tty0 loglevel=8  root=/dev/mmcblk0p4 selinux=0 rhgb LANG=en_US.UTF-8
        devicetree /sun20i-d1-nezha.dtb
	initrd /initramfs-5.15.0-rc1.img
}

Linux kernel for Nezha D1 (WIP)

Using the patches from Smaeul/Ren Guo(T-HEAD)/Allwinner Engineers, enable almost all the features for Fedora,and also rebase to the latest upstream kernel master branch.

Important reference

• Linux kernel source from T-Head
• Allwinner Engineer's REPO

WIP for Fedora

Tekkaman's Linux kernel REPO

Note: We are still working on this for Fedora Image

Checkout Source

git clone https://github.com/tekkamanninja/linux.git
pushd linux
git checkout origin/allwinner_nezha_d1_devel
popd

Config

pushd linux
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv nezha_fedora_defconfig
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv menuconfig
popd

Cross Build and install

# RISCV_ROOTFS_BOOT is the mount point of the boot partition in SD card 
# RISCV_ROOTFS_BOOT=/run/media/../boot
# RISCV_ROOTFS  is the mount point of the Fedora rootfs partition in SD card 
# RISCV_ROOTFS=/run/media/../rootfs
pushd linux
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv INSTALL_PATH=${RISCV_ROOTFS_BOOT} zinstall
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv INSTALL_MOD_PATH=${RISCV_ROOTFS} modules_install
popd

How to Build your own Fedora Remix Image

Please reference to RISC-V: Build Bootable Image