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gba_video.h

#define	REG_BG0HOFS		*((u16 *)(REG_BASE + 0x10))	// BG 0 H Offset
#define	REG_BG0VOFS		*((u16 *)(REG_BASE + 0x12))	// BG 0 V Offset
#define	REG_BG1HOFS		*((u16 *)(REG_BASE + 0x14))	// BG 1 H Offset
#define	REG_BG1VOFS		*((u16 *)(REG_BASE + 0x16))	// BG 1 V Offset
#define	REG_BG2HOFS		*((u16 *)(REG_BASE + 0x18))	// BG 2 H Offset
#define	REG_BG2VOFS		*((u16 *)(REG_BASE + 0x1a))	// BG 2 V Offset
#define	REG_BG3HOFS		*((u16 *)(REG_BASE + 0x1c))	// BG 3 H Offset
#define	REG_BG3VOFS		*((u16 *)(REG_BASE + 0x1e))	// BG 3 V Offset

#define	REG_BG2PA	*((s16 *)(REG_BASE + 0x20))
#define	REG_BG2PB	*((s16 *)(REG_BASE + 0x22))
#define	REG_BG2PC	*((s16 *)(REG_BASE + 0x24))
#define	REG_BG2PD	*((s16 *)(REG_BASE + 0x26))
#define	REG_BG2X	*((s32 *)(REG_BASE + 0x28))
#define	REG_BG2Y	*((s32 *)(REG_BASE + 0x2c))
#define	REG_BG3PA	*((s16 *)(REG_BASE + 0x30))
#define	REG_BG3PB	*((s16 *)(REG_BASE + 0x32))
#define	REG_BG3PC	*((s16 *)(REG_BASE + 0x34))
#define	REG_BG3PD	*((s16 *)(REG_BASE + 0x36))
#define	REG_BG3X	*((s32 *)(REG_BASE + 0x38))
#define	REG_BG3Y	*((s32 *)(REG_BASE + 0x3c))

These registers should be volatile.

Sound channel 3 is a programmable wave table, but is referred to in the header as a triangle channel.
Pinobatch says:
"It's because when I wrote the header that that header was based on, I had recent experience with the Nintendo Entertainment System and I started by using the wavetable channel to replicate the capability of the NES triangle channel until I realized that the GBA internal speaker's 800 Hz high pass characteristic wouldn't let the typical applications of the NES triangle wave through"

I don't know if this is being kept as a fun historical quirk, or if nobody's actually thought about it.

So one team put the tools need for this into gba-tools, but you didn't bother to add the libraries that makes the tool actually useful? You support other libraries/modules but you don't like gbfs?

Compiling with WStrict-Prototypes leads to all kinds of warnings due to parameterless function signatures/declarations in the include files not having "void" in the parameters.
This can be a problem because it prevents using WError with WStrict-Prototypes.