From 5d6f52671e76ca2d55d74e676ac4c38ceb14a2d3 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 4 Apr 2022 11:52:31 +0200 Subject: 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 --- arch/arm/mach-mv78xx0/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arm/mach-mv78xx0/Kconfig') diff --git a/arch/arm/mach-mv78xx0/Kconfig b/arch/arm/mach-mv78xx0/Kconfig index ea52c7fabb79..f0276f0d1102 100644 --- a/arch/arm/mach-mv78xx0/Kconfig +++ b/arch/arm/mach-mv78xx0/Kconfig @@ -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 -- cgit