config BCM2835 bool "Broadcom BCM2835 SoC support" depends on ARCH_BCM283X select CPU_ARM1176 config BCM2836 bool "Broadcom BCM2836 SoC support" depends on ARCH_BCM283X select ARMV7_LPAE select CPU_V7A config BCM2837 bool "Broadcom BCM2837 SoC support" depends on ARCH_BCM283X config BCM2837_32B bool "Broadcom BCM2837 SoC 32-bit support" depends on ARCH_BCM283X select BCM2837 select ARMV7_LPAE select CPU_V7A config BCM2837_64B bool "Broadcom BCM2837 SoC 64-bit support" depends on ARCH_BCM283X select BCM2837 select ARM64 config BCM2711 bool "Broadcom BCM2711 SoC support" depends on ARCH_BCM283X config BCM2711_32B bool "Broadcom BCM2711 SoC 32-bit support" depends on ARCH_BCM283X select BCM2711 select ARMV7_LPAE select CPU_V7A config BCM2711_64B bool "Broadcom BCM2711 SoC 64-bit support" depends on ARCH_BCM283X select BCM2711 select ARM64 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 targeting the ARM1176 ISA. select BCM2835 config TARGET_RPI_0_W bool "Raspberry Pi Zero W" help Support for all ARM1176-/BCM2835-based Raspberry Pi variants, such as the RPi Zero model W. This option assumes the VideoCore firmware is configured to use the mini UART (rather than PL011) for the serial console. This is the default on the RPi Zero W. To enable the UART console, the following non-default option must be present in config.txt: enable_uart=1. This is required for U-Boot to operate correctly, even if you only care about the HDMI/usbkbd console. This option creates a build targeting the ARMv7/AArch32 ISA. select BCM2835 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 targeting the ARMv7/AArch32 ISA. select BCM2836 config TARGET_RPI_3_32B bool "Raspberry Pi 3 32-bit build" help Support for all BCM2837-based Raspberry Pi variants, such as the RPi 3 model B, in AArch32 (32-bit) mode. This option assumes the VideoCore firmware is configured to use the mini UART (rather than PL011) for the serial console. This is the default on the RPi 3. To enable the UART console, the following non- default option must be present in config.txt: enable_uart=1. This is required for U-Boot to operate correctly, even if you only care about the HDMI/usbkbd console. This option creates a build targeting the ARMv7/AArch32 ISA. select BCM2837_32B config TARGET_RPI_3 bool "Raspberry Pi 3 64-bit build" help Support for all BCM2837-based Raspberry Pi variants, such as the RPi 3 model B, in AArch64 (64-bit) mode. This option assumes the VideoCore firmware is configured to use the mini UART (rather than PL011) for the serial console. This is the default on the RPi 3. To enable the UART console, the following non- default option must be present in config.txt: enable_uart=1. This is required for U-Boot to operate correctly, even if you only care about the HDMI/usbkbd console. At the time of writing, the VC FW requires a non-default option in config.txt to request the ARM CPU boot in 64-bit mode: arm_control=0x200 The VC FW typically provides ARM "stub" code to set up the CPU and quiesce secondary SMP CPUs. This is not currently true in 64-bit mode. In order to boot U-Boot before the VC FW is enhanced, please see the commit description for the commit which added RPi3 support for a workaround. Since the instructions are temporary, they are not duplicated here. The VC FW enhancement is tracked in https://github.com/raspberrypi/firmware/issues/579. This option creates a build targeting the ARMv8/AArch64 ISA. select BCM2837_64B config TARGET_RPI_4_32B bool "Raspberry Pi 4 32-bit build" help Support for all BCM2711-based Raspberry Pi variants, such as the RPi 4 model B, in AArch32 (32-bit) mode. This option assumes the VideoCore firmware is configured to use the mini UART (rather than PL011) for the serial console. This is the default on the RPi 4. To enable the UART console, the following non- default option must be present in config.txt: enable_uart=1. This is required for U-Boot to operate correctly, even if you only care about the HDMI/usbkbd console. Due to hardware incompatibilities, this can't be used with BCM283/5/6/7. This option creates a build targeting the ARMv7/AArch32 ISA. select BCM2711_32B config TARGET_RPI_4 bool "Raspberry Pi 4 64-bit build" help Support for all BCM2711-based Raspberry Pi variants, such as the RPi 4 model B, in AArch64 (64-bit) mode. This option assumes the VideoCore firmware is configured to use the mini UART (rather than PL011) for the serial console. This is the default on the RPi 4. To enable the UART console, the following non- default option must be present in config.txt: enable_uart=1. This is required for U-Boot to operate correctly, even if you only care about the HDMI/usbkbd console. Due to hardware incompatibilities, this can't be used with BCM283/5/6/7. Also, due to a bug in firmware, switching to 64bit mode doesn't happen automatically based on the kernel's image filename. See https://github.com/raspberrypi/firmware/issues/1193 for more details. Until that is resolved, the configuration (config.txt) needs to explicitly set: arm_64bit=1. This option creates a build targeting the ARMv8/AArch64 ISA. select BCM2711_64B endchoice config SYS_BOARD default "rpi" config SYS_VENDOR default "raspberrypi" config SYS_SOC default "bcm283x" config SYS_CONFIG_NAME default "rpi" endmenu