Miyoo(Bittboy)

Introduction

You might ask why do you need to port Linux OS into Miyoo(Bittboy) handheld because stock firmware seems running pretty well ? Since stock firmware is Melis OS that is close-source for Allwinner SoC, the performance is not good as I expected (not you) and it is not easy to port game and emulator to this OS because we cannot get more information from google unless reversing (it is not easy as you think). Of course, it also lacks toolchain to port app and emulator. So, if I can port Linux OS into this tiny device, I think it will be more powerful. Besides, we can also port more games and emulators into this device if it is Linux OS. Now, I finish most of tasks and it is time to share to all of you, enjoy !

Component	Description
CPU	Allwinner F1C500S
RAM	32MB
Screen	2.4" IPS 320x240(LH240Q36)
Slot	MicroSD
Gamepad	DPad, 4 Buttons, Start, Select, Menu
USB	Client
Battery	3.7V 600mA
Dimension	68mm x 100mm x 15mm
Weight	80g

How to build Linux OS for Miyoo(Bittboy)

prepare environment

Debian 9 (x64)
download all of sources in release page

configure toolchain

extract toolchain.7z into /opt/miyoo
export command
- export PATH=$PATH:/opt/miyoo/bin

build uboot

boot from spi flash
- ARCH=arm CROSS_COMPILE=arm-linux- make licheepi_nano_spiflash_defconfig && ARCH=arm CROSS_COMPILE=arm-linux- make
boot from sdcard
- ARCH=arm CROSS_COMPILE=arm-linux- make licheepi_nano_defconfig && ARCH=arm CROSS_COMPILE=arm-linux- make

build kernel (sdcard 4bits)

vim arch/arm/boot/dts/suniv-f1c500s-miyoo.dts +55
- bus-width = <4>;
ARCH=arm CROSS_COMPILE=arm-linux- make miyoo_defconfig && ARCH=arm CROSS_COMPILE=arm-linux- make zImage modules dtbs

build kernel (sdcard 1bit)

vim arch/arm/boot/dts/suniv-f1c500s-miyoo.dts +55
- bus-width = <1>;
ARCH=arm CROSS_COMPILE=arm-linux- make miyoo_defconfig && ARCH=arm CROSS_COMPILE=arm-linux- make zImage modules dtbs

build boot.scr

mkimage -C none -A arm -T script -d boot.cmd boot.scr

prepare sdcard (>= 4GB)

partition 1: 32MB FAT32 (boot.scr, dtb and zImage)
partition 2: 256MB EXT4 (rootfs)
partition 3: 256MB SWAP
partition 4: FAT32 (GMenu2X, config files and emulators)

flash uboot:

boot from spi flash
- short spi pin1 and pin2
- connect USB to PC
- found device:
  - usb 4-1.2.4.4: New USB device found, idVendor=1f3a, idProduct=efe8
- release spi pin1 and pin2
- flash command:
  - $ sudo sunxi-fel -p spiflash-write 0 u-boot-sunxi-with-spl.bin
boot from SDCard
- $ sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8

flash kernel

copy boot.scr into partition 1
copy zImage into partition 1
copy suniv-f1c500s-miyoo.dtb into partition 1
copy r61520fb.ko into kernel folder in partition 2
copy daemon into kernel folder in partition 2

ray-zyh/miyoo