Buildroot setup for Miyoo Mini

This is not ready for use yet!!

This will brick your device. You have been warned.

Current status

Does not auto boot, you will need uart to boot up
Does not launch retroarch to start, you will need to manually do that
Does not play games yet
the only way to return to stock is to have "fancy" equipment.
this has only been tested on the miyoo mini plus, if someone has a miyoo mini and wants to help, please reach out.
buttons in retroarch do not work yet by default. there's some overlay work that needs to happen
spiflash does not yet work once you're in linux - so you can't boot a rootfs off of the spiflash
brightness does not yet work
Improved power management can be had with the axp223, but not yet configured
wifi usb is always powered
better hardware controls within retroarch

Building

make -j2

(sometimes building more than 2 breaks things....)

Flashing

BE READY TO EXPERIENCE BRICKED DEVICES

There's really a few ways to do this, but if you're coming from stock miyoo stuff - you'll want to get the better uboot

after building:

cd br2miyoomini/package/upgrade_blob
./mxpgenerator_generator.sh
cp images/miyoo354_fw.img <YOUR_MMC>/miyoo354_fw.img

Booting

After you've flashed into the system, you'll be greated with a nice uboot prompt shell

if at any point the mmc card seems to be unreadable, reset the device with reset

reset

To flash new updates:

setenv SdUpgradeImage miyoo354_fw.img;sdstar

To boot into the kernel located on the spiflash

THIS DOES NOT WORK RIGHT NOW, LOOK AT THE MMC METHOD BELOW

setenv bootargs console=ttyS0,115200 clk_ignore_unused earlyprintk debug root=/dev/mtdblock4 ro rootfstype=squashfs rootwait

i2c dev 0; i2c mw 0x34 0x12.1 0x80; bootlogo 0 0 0 0 0; gpio output 4 1; setenv loadaddr 0x22000000; sf probe 0; sf read ${loadaddr} ${sf_kernel_start} ${sf_kernel_size};bootm ${loadaddr}#midrived06

To boot into the kernel located on the mmc

Only works after getting the initial flash completed, you need the custom uboot

write the sdcard.img from buildroot/output/images/sdcard.img to your sdcard
boot to uboot prompt on device
setenv bootargs console=ttyS0,115200 clk_ignore_unused earlyprintk debug root=/dev/mmcblk0p2 ro rootfstype=squashfs rootwait
i2c dev 0; i2c mw 0x34 0x12.1 0x80; bootlogo 0 0 0 0 0; gpio output 4 1; setenv loadaddr 0x22000000; fatload mmc 0:1 ${loadaddr} kernel.fit;bootm ${loadaddr}#midrived06

miyoo-oss/buildroot_miyoomini