[Core] Add support for RISC-V builds and GD32VF103 MCU (#12508)

* Add support for RISC-V builds and GD32VF103 MCU

* Add toolchain selection in chibios.mk based on the mcu selected in
mcu_selection.mk
* Reorder and added comments to chibios.mk to have a streamlined makefile
* Add GD32VF103 mcu to possible targets for QMK.
* Add STM32 compatibility for GD32VF103 MCU, this is hacky but more efficent
  then rewriting every driver.
* Add GigaDevice DFU bootloader as flash target, please note that
  dfu-util of at least version 0.10 is needed.
* Add analog driver compatibility
* Add apa102 bitbang driver compatibility
* Add ws2812 bitbang driver compatibility
* Add eeprom in flash emulation compatibility
* Allow faster re-builds with ccache

* Add SiPeed Longan Nano to platform files

* Add SiPeed Longan Nano Onekeys

* Make quine compatible with other bootloaders

* Support builds with picolibc

* Add risc-v toolchain to arch and debian/ubuntu scripts

2 files changed, 7 insertions, 0 deletions

diff --git a/docs/compatible_microcontrollers.md b/docs/compatible_microcontrollers.md
index f4aab5f5b..39e9061c2 100644
--- a/docs/compatible_microcontrollers.md
+++ b/docs/compatible_microcontrollers.md
@@ -48,3 +48,9 @@ You can also use any ARM chip with USB that [ChibiOS](https://www.chibios.org) s
 ## Atmel ATSAM
 
 There is limited support for one of Atmel's ATSAM microcontrollers, that being the [ATSAMD51J18A](https://www.microchip.com/wwwproducts/en/ATSAMD51J18A) used by the [Massdrop keyboards](https://github.com/qmk/qmk_firmware/tree/master/keyboards/massdrop).
+
+## RISC-V
+
+### GigaDevice
+
+[ChibiOS-Contrib](https://github.com/ChibiOS/ChibiOS-Contrib) has support for the GigaDevice [GD32VF103 series](https://www.gigadevice.com/products/microcontrollers/gd32/risc-v/mainstream-line/gd32vf103-series/) microcontrollers and provides configurations for the [SiPeed Longan Nano](https://longan.sipeed.com/en/) development board that uses this microcontroller. It is largely pin and feature compatible with STM32F103 and STM32F303 microcontrollers.
\ No newline at end of file
diff --git a/docs/driver_installation_zadig.md b/docs/driver_installation_zadig.md
index 9155e56e3..003629ba9 100644
--- a/docs/driver_installation_zadig.md
+++ b/docs/driver_installation_zadig.md
@@ -93,6 +93,7 @@ The device name here is the name that appears in Zadig, and may not be what the
 |`usbasploader`|USBasp                        |`16C0:05DC`   |libusbK|
 |`apm32-dfu`   |APM32 DFU ISP Mode            |`314B:0106`   |WinUSB |
 |`stm32-dfu`   |STM32 BOOTLOADER              |`0483:DF11`   |WinUSB |
+|`gd32v-dfu`   |GD32V BOOTLOADER              |`28E9:0189`   |WinUSB |
 |`kiibohd`     |Kiibohd DFU Bootloader        |`1C11:B007`   |WinUSB |
 |`stm32duino`  |Maple 003                     |`1EAF:0003`   |WinUSB |
 |`qmk-hid`     |(keyboard name) Bootloader    |`03EB:2067`   |HidUsb |