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 <and...@balena.io>
Signed-off-by: Matthias Brugger <mbrug...@suse.com>
---
arch/arm/mach-bcm283x/Kconfig | 62 +++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index 8e69914a83..09a5b42bbb 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -26,6 +26,23 @@ config BCM2837_64B
select BCM2837
select ARM64
+config BCM2838
+ bool "Broadcom BCM2838 SoC support"
+ depends on ARCH_BCM283X
+
+config BCM2838_32B
+ bool "Broadcom BCM2838 SoC 32-bit support"
+ depends on ARCH_BCM283X
+ select BCM2838
+ select ARMV7_LPAE
+ select CPU_V7A
+
+config BCM2838_64B
+ bool "Broadcom BCM2838 SoC 64-bit support"
+ depends on ARCH_BCM283X
+ select BCM2838
+ 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 BCM2838-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 BCM2838_32B
+
+config TARGET_RPI_4
+ bool "Raspberry Pi 4 64-bit build"
+ help
+ Support for all BCM2838-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 BCM2838_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 BCM2838
endmenu
--
2.22.0
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