BCM3390

The chipset itself uses a 1849-lead BGA package (43x43, pad size 0.4mm, pitch 0.8mm). Some intersting pins are shown below (pins are named A1 to BC43).

UARTs

Name	Address	RX pin	TX pin	Function
BCHP_UARTA	0x2040a900	AG5	AH4	ARM boot console
BCHP_UART0_PER	0x03c00640	T39	T40	CM firmware console

SPI NOR flash

Name	Address	SCLK	HOLD#	WP#	CS#	MOSI	MISO
BCHP_HIF_MSPI	0x204a3400	AE3	AD2	AC2	AC6	AE2	AD3