felucca-bsp
Copyright (C) 2026 Leo Kuroshita (@kurogedelic), Hügelton Instruments

This project was written against the public documentation and headers of the JieLi AC79 AIoT
SDK (Apache-2.0, JieLi Technology), and follows the register sequences of its flash, USB and
debug drivers. No SDK source is intended to be included. The SDK files needed to build a
firmware package (uboot.boot, cfg_tool.bin, eq_cfg_hw.bin) are not distributed here.

chip/ota.c speaks the SysEx update protocol of the M-VAVE updater and reads the JieLi update
package header. No vendor code is intended to be included.

Switching the divide-by-zero trap off in chip/fm1_irq.h follows a fix proposed by Steve Pinkham
(spinkham) for Felucca (pull request 111). The code and the comment here are written independently.

chip/usb.c comes from Felucca, where it is GPL-3.0-only. The device driver retains Leo Kuroshita's
copyright; Kerem Kilic adapted the include path and added the BSP host integration. Here it is
MPL-2.0: its MIDI clock and transport sync is keremimo's (Felucca commit 019e2ad), licensed under MPL-2.0 by
agreement: https://github.com/hugelton/felucca-bsp/pull/3

The second core (chip/fm1_cpu1.h, chip/fm1_cpu1.S, chip/fm1_cpu1_stop.h, its fault path in chip/fm1_irq.h and
chip/fm1_vec.S) comes from Melodee (https://github.com/keremimo/melodee, GPL-3.0-only there) by Kerem Kilic
(keremimo), licensed under MPL-2.0 by agreement: https://github.com/hugelton/felucca-bsp/issues/5. Its safe hold
adapts Felucca 1.6.1's fm1_cpu1_halt (https://github.com/hugelton/Felucca/pull/247). The units whose second core
misreads shared RAM were measured by Jangada's maintainer (zednaked, https://github.com/zednaked/jangada,
charlesvestal/fm1-x0x#10); those measurements are credited, no code of Jangada's is included.

The history of these files comes from Felucca (https://github.com/hugelton/Felucca), where
they were first published under GPL-3.0-only by the same copyright holder. Each commit
message names the Felucca commit it was taken from. Releases of Felucca that already
contain these files stay under GPL-3.0-only.

Unofficial. Not affiliated with or endorsed by M-VAVE or JieLi.

USB MIDI host (chip/usb_host.c, chip/usb_host_desc.h, the host additions in chip/fm1_usb.h,
and tests/usb_host_test.c): Copyright (C) 2026 Adrien Tibi (Recursive Field Instruments,
recursivefieldinstruments) and Kerem Kilic (Ellic Studio, keremimo). Ported from
https://github.com/keremimo/melodee at e9eab97a5bd93c7e2f38bca7aae5006e59f21148, specifically:
- 0d705bf43a74dd53f244cfacf3eea2bd0b978289: Adrien's enumeration, hub handling, input,
  PHY setup, descriptor parser and SIE/bus tests.
- 198c8fd4383a19fa8d53f8db988babfffe366b2e: Adrien's input-toggle and retry fixes.
- b4380f9474e18d1437f33ad84459c86a8458e815: Kerem's MIDI output, endpoint validation, ACK ownership and recovery tests.
- eb57309540ee5a9f92e9b5188ac3ace478fa34db: Kerem's disconnect debounce.
- 44a311a57b957ca088027d4045f289665ba26b20: Kerem's idle probe/hub connection-change fixes
  and regression tests, backported after the initial source snapshot.
Adrien agreed to MPL licensing for his contributions in response to the MPL request:
https://github.com/keremimo/melodee/pull/75#issuecomment-6384184014
Kerem licenses his contributions to this port under MPL-2.0 as well. The original
Melodee copies remain GPL-3.0-only. chip/usb.c retains Felucca's device code, with new
MPL-2.0 integration by Kerem Kilic. The host's register sequences follow the public
AC79 SDK; no SDK implementation source is copied into this port.