union-minui/cores

Adding additional cores

In the makefile: first add core name to the list of CORES. By default, this will git clone https://github.com/libretro/<core_name> but you can override the repo path by setting <core_name>_REPO. You can select a specific commit by setting <core_name>_HASH. If the resulting lib name doesn't match the <core_name> you can specify the actual name by setting <core_name>_CORE. Additional flags required to build the core can be added by setting <core_name>_FLAGS. If the core does not use a makefile named Makefile you can specify a custom makefil by setting <core_name>_MAKEFILE. If building takes place in a subfolder you can specify that by setting <core_name>_BUILD_PATH.

In the patches directory: create a patch file that adds an RG35XX target to the makefile. To do this I run make clone-<core_name> then seach the makefile for MIYOO and add a new else ifeq ($(platform), rg35xx) condition. I'll find a comparable device to base this addition on (either the Miyoo Mini or a Dingux device). The architecture flags should be something like -marm -mtune=cortex-a9 -mfpu=neon-fp16 -mfloat-abi=hard -march=armv7-a. I usually enable -fPIC -flto as well. Then I'll try manually building the core. If the build succeeds and runs on the device I'll create the patch with git and name it <core_name>.patch. Then I delete the core folder and run make <core_name> and confirm the build succeeds and runs on the device.

In the skeleton/EXTRAS/Emus/rg35xx/ directory I create a new pak for the emulator and add it to the bundle step of MinUI's makefile. I also create the requisite Bios, Roms, and Saves folders and document the addition in the extras readme.

Fin