Created attachment 8801 [details] defconfig Selecting i486 as target architecture variant results in a kernel that's built for i686. Steps to reproduce: Build a image with the attached minimal defconfig and run `qemu-system-i386 -nographic -cpu 486 -kernel output/images/bzImage` results in `This kernel requires an i686 CPU, but only detected an i486 CPU.`.
(In reply to moelzerjens from comment #0) The buildroot kernel configure/make is called with the correct 'ARCH=i386' and uses the kernel i386_defconfig without further specification of CPU type, which defaults from the linux kernel configure (see e.g. build/linux-5.11/arch/x86/Kconfig.cpu) to M686: choice prompt "Processor family" default M686 if X86_32 default GENERIC_CPU if X86_64 For workaround specify the correct CPU either by configuring a custom linux kernel config/defconfig file (or configure by 'make linux-menuconfig')... Maybe something which can be improved in buildroot..., on the other side a very special use-case ;-)
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