ARM: rework endianess selection

Choosing big-endian vs little-endian kernels in Kconfig has not worked correctly since the introduction of CONFIG_ARCH_MULTIPLATFORM a long time ago. The problems is that CONFIG_BIG_ENDIAN depends on ARCH_SUPPORTS_BIG_ENDIAN, which can set by any one platform in the config, but would actually have to be supported by all of them. This was mostly ok for ARMv6/ARMv7 builds, since these are BE8 and tend to just work aside from problems in nonportable device drivers. For ARMv4/v5 machines, CONFIG_BIG_ENDIAN and CONFIG_ARCH_MULTIPLATFORM were never set together, so this was disabled on all those machines except for IXP4xx. As IXP4xx can now become part of ARCH_MULTIPLATFORM, it seems better to formalize this logic: all ARMv4/v5 platforms get an explicit dependency on being either big-endian (ixp4xx) or little-endian (the rest). We may want to fix ixp4xx in the future to support both, but it does not work in LE mode at the moment. For the ARMv6/v7 platforms, there are two ways this could be handled a) allow both modes only for platforms selecting 'ARCH_SUPPORTS_BIG_ENDIAN' today, but only LE mode for the others, given that these were added intentionally at some point. b) allow both modes everwhere, given that it was already possible to build that way by e.g. selecting ARCH_VIRT, and that the list is not an accurate reflection of which platforms may or may not work. Out of these, I picked b) because it seemed slighly more logical to me. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2026-08-13 14:19:53 -07:00 · 2022-04-08 17:20:54 +02:00
parent a3102fafdc
commit 5d6f52671e
34 changed files with 54 additions and 33 deletions
@@ -349,6 +349,7 @@ config ARCH_MULTIPLATFORM

 config ARCH_FOOTBRIDGE
 	bool "FootBridge"
+	depends on CPU_LITTLE_ENDIAN
 	select CPU_SA110
 	select FOOTBRIDGE
 	select NEED_MACH_MEMORY_H
@@ -358,7 +359,7 @@ config ARCH_FOOTBRIDGE

 config ARCH_IXP4XX
 	bool "IXP4xx-based"
-	select ARCH_SUPPORTS_BIG_ENDIAN
+	depends on CPU_BIG_ENDIAN
 	select ARM_PATCH_PHYS_VIRT
 	select CPU_XSCALE
 	select GPIO_IXP4XX
@@ -374,6 +375,7 @@ config ARCH_IXP4XX

 config ARCH_PXA
 	bool "PXA2xx/PXA3xx-based"
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_MTD_XIP
 	select ARM_CPU_SUSPEND if PM
 	select AUTO_ZRELADDR
@@ -393,6 +395,7 @@ config ARCH_PXA
 config ARCH_RPC
 	bool "RiscPC"
 	depends on !CC_IS_CLANG && GCC_VERSION < 90100 && GCC_VERSION >= 60000
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_ACORN
 	select ARCH_MAY_HAVE_PC_FDC
 	select ARCH_SPARSEMEM_ENABLE
@@ -411,6 +414,7 @@ config ARCH_RPC

 config ARCH_SA1100
 	bool "SA1100-based"
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_MTD_XIP
 	select ARCH_SPARSEMEM_ENABLE
 	select CLKSRC_MMIO
@@ -429,6 +433,7 @@ config ARCH_SA1100

 config ARCH_OMAP1
 	bool "TI OMAP1"
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_OMAP
 	select CLKSRC_MMIO
 	select GENERIC_IRQ_CHIP
@@ -505,7 +510,6 @@ config ARCH_VIRT
 	select ARM_GIC_V3_ITS if PCI
 	select ARM_PSCI
 	select HAVE_ARM_ARCH_TIMER
-	select ARCH_SUPPORTS_BIG_ENDIAN

 config ARCH_AIROHA
 	bool "Airoha SoC Support"
@@ -2,6 +2,7 @@
 config MACH_ASM9260
 	bool "Alphascale ASM9260"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select CPU_ARM926T
 	select ASM9260_TIMER
 	help
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_ASPEED
 	bool "Aspeed BMC architectures"
-	depends on ARCH_MULTI_V5 || ARCH_MULTI_V6 || ARCH_MULTI_V7
+	depends on (CPU_LITTLE_ENDIAN && ARCH_MULTI_V5) || ARCH_MULTI_V6 || ARCH_MULTI_V7
 	select SRAM
 	select WATCHDOG
 	select ASPEED_WATCHDOG
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_AT91
 	bool "AT91/Microchip SoCs"
-	depends on ARCH_MULTI_V4T || ARCH_MULTI_V5 || ARCH_MULTI_V7 || ARM_SINGLE_ARMV7M
+	depends on (CPU_LITTLE_ENDIAN && (ARCH_MULTI_V4T || ARCH_MULTI_V5)) || \
+		ARCH_MULTI_V7 || ARM_SINGLE_ARMV7M
 	select ARM_CPU_SUSPEND if PM && ARCH_MULTI_V7
 	select COMMON_CLK_AT91
 	select GPIOLIB
@@ -2,6 +2,7 @@
 menuconfig ARCH_CLPS711X
 	bool "Cirrus Logic EP721x/EP731x-based"
 	depends on ARCH_MULTI_V4T
+	depends on CPU_LITTLE_ENDIAN
 	select CLPS711X_TIMER
 	select CPU_ARM720T
 	select GPIOLIB
@@ -3,6 +3,7 @@
 menuconfig ARCH_DAVINCI
 	bool "TI DaVinci"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select DAVINCI_TIMER
 	select ZONE_DMA
 	select PM_GENERIC_DOMAINS if PM
@@ -2,6 +2,7 @@
 menuconfig ARCH_EP93XX
 	bool "EP93xx-based"
 	depends on ARCH_MULTI_V4T
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_SPARSEMEM_ENABLE
 	select ARM_AMBA
 	select ARM_VIC
@@ -8,7 +8,6 @@
 menuconfig ARCH_EXYNOS
 	bool "Samsung Exynos"
 	depends on ARCH_MULTI_V7
-	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
 	select ARM_GIC
 	select EXYNOS_IRQ_COMBINER
@@ -2,6 +2,7 @@
 menuconfig ARCH_GEMINI
 	bool "Cortina Systems Gemini"
 	depends on ARCH_MULTI_V4
+	depends on CPU_LITTLE_ENDIAN
 	select ARCH_HAS_RESET_CONTROLLER
 	select ARM_AMBA
 	select ARM_APPENDED_DTB # Old Redboot bootloaders deployed
@@ -2,7 +2,6 @@
 config ARCH_HIGHBANK
 	bool "Calxeda ECX-1000/2000 (Highbank/Midway)"
 	depends on ARCH_MULTI_V7
-	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
 	select ARM_ERRATA_764369 if SMP
 	select ARM_ERRATA_775420
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config ARCH_HISI
 	bool "Hisilicon SoC Support"
-	depends on ARCH_MULTI_V7 || ARCH_MULTI_V5
+	depends on ARCH_MULTI_V7 || (ARCH_MULTI_V5 && CPU_LITTLE_ENDIAN)
 	select ARM_AMBA
 	select ARM_GIC if ARCH_MULTI_V7
 	select ARM_TIMER_SP804
@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_MXC
 	bool "Freescale i.MX family"
-	depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 || ARM_SINGLE_ARMV7M
-	select ARCH_SUPPORTS_BIG_ENDIAN
+	depends on (ARCH_MULTI_V4_V5 && CPU_LITTLE_ENDIAN) || \
+		ARCH_MULTI_V6_V7 || ARM_SINGLE_ARMV7M
 	select CLKSRC_IMX_GPT
 	select GENERIC_IRQ_CHIP
 	select GPIOLIB
@@ -2,6 +2,7 @@
 menuconfig ARCH_IOP32X
 	bool "IOP32x-based platforms"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select CPU_XSCALE
 	select GPIO_IOP
 	select GPIOLIB
@@ -8,7 +8,6 @@ config ARCH_KEYSTONE
 	select ARCH_HAS_RESET_CONTROLLER
 	select ARM_ERRATA_798181 if SMP
 	select COMMON_CLK_KEYSTONE
-	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ZONE_DMA if ARM_LPAE
 	select PINCTRL
 	select PM_GENERIC_DOMAINS if PM
@@ -3,6 +3,7 @@
 config ARCH_LPC32XX
 	bool "NXP LPC32XX"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select ARM_AMBA
 	select CLKSRC_LPC32XX
 	select CPU_ARM926T
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_MMP
 	bool "Marvell PXA168/910/MMP2/MMP3"
-	depends on ARCH_MULTI_V5 || ARCH_MULTI_V7
+	depends on (CPU_LITTLE_ENDIAN && ARCH_MULTI_V5) || ARCH_MULTI_V7
 	select GPIO_PXA
 	select GPIOLIB
 	select PINCTRL
@@ -2,6 +2,7 @@
 menuconfig ARCH_MOXART
 	bool "MOXA ART SoC"
 	depends on ARCH_MULTI_V4
+	depends on CPU_LITTLE_ENDIAN
 	select CPU_FA526
 	select ARM_DMA_MEM_BUFFERABLE
 	select FARADAY_FTINTC010
@@ -2,6 +2,7 @@
 menuconfig ARCH_MV78XX0
 	bool "Marvell MV78xx0"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select CPU_FEROCEON
 	select GPIOLIB
 	select MVEBU_MBUS
@@ -1,8 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_MVEBU
 	bool "Marvell Engineering Business Unit (MVEBU) SoCs"
-	depends on ARCH_MULTI_V7 || ARCH_MULTI_V5
-	select ARCH_SUPPORTS_BIG_ENDIAN
+	depends on ARCH_MULTI_V7 || (ARCH_MULTI_V5 && CPU_LITTLE_ENDIAN)
 	select CLKSRC_MMIO
 	select PINCTRL
 	select PLAT_ORION
@@ -16,6 +16,7 @@ config SOC_IMX28
 config ARCH_MXS
 	bool "Freescale MXS (i.MX23, i.MX28) support"
 	depends on ARCH_MULTI_V5
+	depends on CPU_LITTLE_ENDIAN
 	select GPIOLIB
 	select MXS_TIMER
 	select PINCTRL
--- a/Show More
+++ b/Show More