pcduino3B-kernel-instructions

An updated set of instructions to boot your pcduino3b with the most up to date kernel

Make PcDuino3b Kernel:

1. Create a directory to perform all your kernel making needs in, such as mkdir pcduino3 and then enter that directory with cd pcduino3.
2. Clone the repo of our ARM Kernel making script git clone https://github.com/RobertCNelson/linux-dev.git
3. Modify build_kernel.sh make_menuconfig () to the following:

make_menuconfig () {
	cd "${DIR}/KERNEL" || exit
	wget -c https://raw.githubusercontent.com/cglmrfreeman/pcduino3B-kernel-instructions/master/pcduino3_nano_config
	make ARCH=${KERNEL_ARCH} CROSS_COMPILE="${CC}" sunxi_defconfig
	make ARCH=${KERNEL_ARCH} CROSS_COMPILE="${CC}" menuconfig KCONFIG_CONFIG=pcduino3_nano_config
	if [ ! -f "${DIR}/.yakbuild" ] ; then
		cp -v .config "${DIR}/patches/defconfig"
	fi
	cd "${DIR}/" || exit
}

(This allows proper pcduino3b config settings to be applied to the kernel)

4. cd linux-dev and run ./build_kernel.sh (You may need to install lopz)
5. cd .. and clone the u-boot repo git clone https://github.com/u-boot/u-boot.git then enter the uboot directory cd u-boot.
6. Cross compile u-boot (you may need to install python38-devel, swig; change (ver) to whatever cross-compiler version was downloaded):

make CROSS_COMPILE="../linux-dev/dl/gcc-arm-(ver)-x86_64-arm-none-linux-gnueabihf/bin/arm-none-linux-gnueabihf-" Linksprite_pcDuino3_Nano_defconfig
make CROSS_COMPILE="../linux-dev/dl/gcc-arm-(ver)-x86_64-arm-none-linux-gnueabihf/bin/arm-none-linux-gnueabihf-" menuconfig
make CROSS_COMPILE="../linux-dev/dl/gcc-arm-(ver)-x86_64-arm-none-linux-gnueabihf/bin/arm-none-linux-gnueabihf-"

7. Leave the u-boot folder with cd .. and format SD card with a program you are familair with (such as gparted).

	Type	Size
Partition 1	FAT16	100 MB
Partition 2	Ext4	Remaining Space

8. Create a boot.cmd in the pcduino3 folder with the following lines:

setenv bootargs console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait panic=10 stdout=serial,vga stderr=serial,vga
load mmc 0:1 0x43000000 sun7i-a20-pcduino3-nano.dtb || load mmc 0:1 0x43000000 boot/sun7i-a20-pcduino3-nano.dtb
load mmc 0:1 0x42000000 zImage || load mmc 0:1 0x42000000 boot/zImage
bootz 0x42000000 - 0x43000000

9. Run mkimage -C none -A arm -T script -d boot.cmd boot.scr (Install u-boot-tools if you need)
10. Create "extlinux.conf" in the pcduino3 folder.

TIMEOUT 100
DEFAULT default
MENU TITLE Boot menu

LABEL default
	MENU LABEL Default
        LINUX /zImage
        FDT /sun7i-a20-pcduino3-nano.dtb
        APPEND root=/dev/mmcblk1p2

LABEL exit
	MENU LABEL Local boot script (boot.scr)
        LOCALBOOT 1

11. Extract sun7i-a20-pcduino3-nano.dtb from ""linux-dev/deploy/dbts.tar.gz" (The names of the files may differ and this is easily done in a GUI rather than the command line)
12. Write bootloader to SD card sudo dd if=./u-boot/u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8 where sdX is your SD drive. Use program such as gparted to make sure of the proper letter to use here.
13. Mount your partitions

sudo mkdir -p /media/boot/
sudo mkdir -p /media/rootfs/
sudo mount /dev/sdX1 /media/boot/
sudo mount /dev/sdX2 /media/rootfs/

Again where sdX is your SD drive.

14. Copy boot stuff (your filenames may differ):

sudo cp boot.scr /media/boot/
sudo cp extlinux.conf /media/boot/
sudo cp ./linux-dev/deploy/zImage /media/boot/
sudo cp ./dtb/location/sun7i-a20-pcduino3-nano.dtb /media/boot/

15. Download fs from linaro. Latest (working) is here:

http://releases.linaro.org/debian/images/developer-armhf/17.06/linaro-stretch-developer-20170622-41.tar.gz

16. Extract the filesystem to rootfs with sudo tar xpvf linaro-stretch-developer-20170622-41.tar.gz -C /media/rootfs/
17. Extract the "modules.tar.gz" and put the "lib" folder in "/linux-dev/deploy" (Again most easily done from a GUI).
18. Put the lib modules in the rootfs lib with sudo cp -R ./linux-dev/deploy/lib/ /media/rootfs/
19. Edit fstab with sudo nano /media/rootfs/etc/fstab and add the following lines:

/dev/mmcblk0p2  /      auto  errors=remount-ro  0  1
/dev/mmcblk0p1  /boot  auto  errors=remount-ro  0  1

20. Now edit the network interfaces with sudo nano /media/rootfs/etc/network/interfaces and add

auto lo
iface lo inet loopback
 
auto eth0
iface eth0 inet dhcp

21. Unmount your medias

sudo umount /media/boot/
sudo umount /media/rootfs/

22. DONE!

Optional

Install PiHole

1. After hooking up and ssh-ing into your pcduino3b, perform a sudo apt-get update and sudo apt-get upgrade.
2. After a sudo reboot,sudo su into root and perform the One Step Automated Install: curl -sSL https://install.pi-hole.net | bash
3. Follow the steps to install PiHole!
4. Enjoy!

Old Linksprite instructions here (Archived in case Linksprite domain goes away) : https://archive.is/K8H1Z

Minor instruction modifications and config file taken from here: https://github.com/nightseas/pcduino3_nano_a20