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ARM: bcm283x: Define configs for RaspberryPi 4

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Define two target configs for Raspberry Pi 4 (32 and 64bit) and the
corresponding BCM2838* configs.

Be aware of the current limitation in firmware which requires an
explicit configuration to force the arm in 64bit mode when the
respective target is used.

Signed-off-by: Andrei Gherzan <andrei@balena.io>
[mb: rename BCM2838 -> BCM2711]
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
This commit is contained in:
Andrei Gherzan 2019-07-24 15:39:06 +01:00 committed by Matthias Brugger
parent 1cfac5204c
commit c6bcf05fcd
1 changed files with 62 additions and 0 deletions
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62
arch/arm/mach-bcm283x/Kconfig
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@ -26,6 +26,23 @@ config BCM2837_64B
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
@ -127,6 +144,50 @@ config TARGET_RPI_3
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
@ -145,5 +206,6 @@ config BCM283x_BASE
hex
default "0x20000000" if BCM2835
default "0x3f000000" if BCM2836 || BCM2837
default "0xfe000000" if BCM2711
endmenu