u-boot-brain/arch/arm/mach-bcm283x/Kconfig

config BCM2835
	bool "Broadcom BCM2835 SoC support"
	depends on ARCH_BCM283X

config BCM2836
	bool "Broadcom BCM2836 SoC support"
	depends on ARCH_BCM283X

menu "Broadcom BCM283X family"
	depends on ARCH_BCM283X

choice
	prompt "Broadcom BCM283X board select"
	optional

config TARGET_RPI
	bool "Raspberry Pi (all BCM2835 variants)"
	help
	  Support for all ARM1176-/BCM2835-based Raspberry Pi variants, such as
	  the A, A+, B, B+, Compute Module, and Zero. This option cannot
	  support BCM2836/BCM2837-based Raspberry Pis such as the RPi 2 and
	  RPi 3 due to different peripheral address maps.

	  This option creates a build targetting the ARM1176 ISA.
	select BCM2835
	select CPU_ARM1176

config TARGET_RPI_2
	bool "Raspberry Pi 2"
	help
	  Support for all BCM2836-based Raspberry Pi variants, such as
	  the RPi 2 model B.

	  This option also supports BCM2837-based variants such as the RPi 3
	  Model B, when run in 32-bit mode, provided you have configured the
	  VideoCore firmware to select the PL011 UART for the console by:
	  a) config.txt should contain dtoverlay=pi3-miniuart-bt.
	  b) You should run the following to tell the VC FW to process DT when
	  booting, and copy u-boot.bin.img (rather than u-boot.bin) to the SD
	  card as the kernel image:

	       path/to/kernel/scripts/mkknlimg --dtok u-boot.bin u-boot.bin.img

	  This works as of firmware.git commit 046effa13ebc "firmware:
	  arm_loader: emmc clock depends on core clock See:
	  https://github.com/raspberrypi/firmware/issues/572".

	  This option creates a build targetting the ARMv7/AArch32 ISA.
	select ARMV7_LPAE
	select BCM2836
	select CPU_V7

endchoice

config SYS_BOARD
	default "rpi" if TARGET_RPI
	default "rpi_2" if TARGET_RPI_2

config SYS_VENDOR
	default "raspberrypi"

config SYS_SOC
	default "bcm283x"

config SYS_CONFIG_NAME
	default "rpi" if TARGET_RPI
	default "rpi_2" if TARGET_RPI_2

endmenu