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The Bootlin uClibc toolchains for m68k-68xxx, riscv32-ilp32d, and xtensa-lx60 require an MMU. However, their generated Kconfig entries lack a BR2_USE_MMU dependency, allowing them to be selected for noMMU configurations. External toolchain validation then fails with: MMU support available in C library, please enable BR2_USE_MMU Add the missing BR2_USE_MMU dependencies for these architectures to prevent them from being selected for noMMU targets. Signed-off-by: Fengwei Tan <tfx2001@outlook.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>