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| author | Stephen Warren <swarren@wwwdotorg.org> | 2016-04-01 21:14:15 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-04-11 12:44:38 -0400 |
| commit | d22a765755ba318ce162a976f51d44000a201394 (patch) | |
| tree | d259579e9edc7c8ff8f90c73dc44658c3c8a41d6 /arch | |
| parent | 7439b4399b14242e6c41b86734baa3fe31c4517f (diff) | |
| download | u-boot-d22a765755ba318ce162a976f51d44000a201394.tar.gz u-boot-d22a765755ba318ce162a976f51d44000a201394.tar.bz2 u-boot-d22a765755ba318ce162a976f51d44000a201394.zip | |
ARM: add Raspberry Pi 3 64-bit config
On all Pis so far, the VC FW provides a short stub to set up the ARM CPU
before entering the kernel (a/k/a U-Boot for us). This feature is not
currently supported by the VC FW when booting in 64-bit mode. However,
this feature will likely appear in the near future, and this U-Boot port
assumes that such a feature is in place. Without that feature, or a
temporary workaround described below, U-Boot will not boot.
Once the VC FW does provide the ARM stub, u-boot.bin built for rpi_3 can
be used drectly as kernel7.img, in the same way as any other RPi port. The
following config.txt is required:
# Fix mini UART input frequency, and setup/enable up the UART.
# Without this option, U-Boot will not boot, even if you don't care
# about the serial console. This option will always be required for
# all RPi3 use-cases, unless the PL011 UART is used, which is not
# yet supported by rpi_3* builds of U-Boot.
enable_uart=1
# Boot in AArch64 (64-bit) mode.
# It is possible that a future VC FW will remove the need for this
# option, instead auto-setting 32-/64-bit mode based on the "kernel"
# filename present on the SD card.
arm_control=0x200
Prior to the VC FW providing the ARM boot stub, you can use the following
steps to build an equivalent stub into the U-Boot binary:
git clone https://github.com/swarren/rpi-3-aarch64-demo.git \
../rpi-3-aarch64-demo
(cd ../rpi-3-aarch64-demo && ./build.sh)
Build U-Boot for rpi_3 in the usual way
cat ../rpi-3-aarch64-demo/armstub64.bin u-boot.bin > u-boot.bin.stubbed
Use u-boot.bin.stubbed as kernel7.img on the Pi SD card.
In this case, the following additional entries are required in config.txt:
# Tell the FW to load the kernel image at address 0, the reset vector.
kernel_old=1
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-bcm283x/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig index a4d291d297..a1ad1a4e0f 100644 --- a/arch/arm/mach-bcm283x/Kconfig +++ b/arch/arm/mach-bcm283x/Kconfig @@ -70,12 +70,18 @@ config TARGET_RPI_3_32B select BCM2837 select CPU_V7 +config TARGET_RPI_3 + bool "Raspberry Pi 3 64-bit build" + select ARM64 + select BCM2837 + endchoice config SYS_BOARD default "rpi" if TARGET_RPI default "rpi_2" if TARGET_RPI_2 default "rpi_3_32b" if TARGET_RPI_3_32B + default "rpi_3" if TARGET_RPI_3 config SYS_VENDOR default "raspberrypi" @@ -87,5 +93,6 @@ config SYS_CONFIG_NAME default "rpi" if TARGET_RPI default "rpi_2" if TARGET_RPI_2 default "rpi_3_32b" if TARGET_RPI_3_32B + default "rpi_3" if TARGET_RPI_3 endmenu |