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HY310 Rootfs Bootstrap Guide

Overview

The HY310 boots its rootfs from a USB stick (partition 2, ext4). The kernel uses root=/dev/sda2 rootwait hardcoded in the DTS.

Creating a Debian Rootfs

Prerequisites

sudo apt install debootstrap qemu-user-static

Bootstrap

ROOTFS=/path/to/rootfs
sudo debootstrap --arch=armhf --foreign trixie $ROOTFS http://deb.debian.org/debian
sudo cp /usr/bin/qemu-arm-static $ROOTFS/usr/bin/
sudo chroot $ROOTFS /debootstrap/debootstrap --second-stage

Configure

sudo chroot $ROOTFS bash -c '
echo hy310 > /etc/hostname
echo "root:root" | chpasswd
echo "/dev/sda2 / ext4 defaults,noatime 0 1" > /etc/fstab

# Enable serial console
systemctl enable serial-getty@ttyS0.service

# Network
apt install -y wpasupplicant openssh-server systemd-timesyncd
'

Install Kernel Modules

After building (see BUILDING.md):

sudo cp -a staging/lib/modules/6.16.7 $ROOTFS/lib/modules/
sudo chroot $ROOTFS depmod -a 6.16.7

Install WiFi Firmware

The AIC8800D80 WiFi chip requires firmware files in /lib/firmware/aic8800D80/. These must be obtained from the stock Android firmware (extracted from super.fex vendor partition) or from the AIC vendor SDK.

sudo mkdir -p $ROOTFS/lib/firmware/aic8800D80
sudo cp /path/to/aic8800d80/firmware/* $ROOTFS/lib/firmware/aic8800D80/

Flash to USB Stick

# Partition USB stick: 128MB FAT32 (boot) + rest ext4 (rootfs)
sudo fdisk /dev/sdX  # create 2 partitions
sudo mkfs.vfat -F32 -n HY310BOOT /dev/sdX1
sudo mkfs.ext4 -L HY310ROOT /dev/sdX2

# Copy rootfs
sudo mount /dev/sdX2 /mnt
sudo cp -a $ROOTFS/* /mnt/
sudo umount /mnt

# Copy boot image chunks to FAT partition
sudo mount /dev/sdX1 /mnt
sudo cp mboot32.00 mboot32.01 /mnt/
sudo umount /mnt