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That is because the SoC support depending on CONFIG_ARCH_MXC gets disabled since CONFIG_ARCH_NXP is not defined while said feature depends on it. The default arm defconfig is unaffected as it defines CONFIG_ARCH_NXP=y correctly as excepted. These patches solve the crash causing my confusion: https://lore.kernel.org/all/c84e8246-8104-4409-8d95-389d61bc07af@gmail.com Denis Benato (3): ARM: imx_v4_v5_defconfig: define CONFIG_ARCH_NXP ARM: imx_v6_v7_defconfig: define CONFIG_ARCH_NXP ARM: imxrt_defconfig: define CONFIG_ARCH_NXP arch/arm/configs/imx_v4_v5_defconfig | 1 + arch/arm/configs/imx_v6_v7_defconfig | 1 + arch/arm/configs/imxrt_defconfig | 1 + 3 files changed, 3 insertions(+) -- 2.49.0