I am developing for the RPI Pico and noticed that the definition of the SPI0 & SPI1 variables are pointers to the SPI struct. This differ to the SPI0 definition for generic boards, which is simply a struct. As a result the following code compiles with target=pico but does not compile if target is generic/wasm.

func main() {	machine.SPI1.Configure(machine.SPIConfig{	SDO: machine.GP15, // default SDO pin - TX	SCK: machine.GP14, // default sck pin	SDI: machine.GP28, // default sdi pin	Frequency: 10000000,	})	driver = max72xx.NewDevice(*machine.SPI1, machine.GP13) // Selector // compiler error if target is generic 

This is because the declaration of SPI0 is different depending which tag you use:
machine/machine_rp2040_spi.go

// SPI on the RP2040 var (	SPI0 = &_SPI0	_SPI0 = SPI{	Bus: rp.SPI0,	}	SPI1 = &_SPI1	_SPI1 = SPI{	Bus: rp.SPI1,	} ) 

machine/machine_generic_peripherals.go

var (	UART0 = hardwareUART0	UART1 = hardwareUART1	SPI0 = SPI{0}	SPI1 = SPI{1}	I2C0 = &I2C{0} ) 

It would be more consistent for rp2040 SPI to also be a struct, not a pointer. unless you know a particular reason why this is like that.
Happy to submit a change request if the change makes sense.