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Simon Glass <sjg@chromium.org> says: Several boards use 'test -n ${var}' (unquoted) in env scripts to detect an empty variable and trigger a fallback or skip a hook. That works only because of a U-Boot 'test' quirk where calls with argc < 3 returned false; an empty variable made the expression 'test -n' (one operand) and hit that path. Commit8b0619579b("cmd: test: fix handling of single-argument form of test") aligned 'test' with POSIX so those expressions flipped to true.f7e7c55e53("cmd: test: add bug-compatibility special case for 'test -n'") restored the old behaviour for the exact 'test -n' (one arg) case, so the boards are not broken at runtime today, but the reliance on a bug-compat path isn't great. This series updates various boards to quote each affected variable so the emptiness check is explicit and does not depend on the special-case path. Each commit carries a Fixes: tag pointing at8b0619579bLink: https://lore.kernel.org/r/20260503204936.3151124-1-sjg@chromium.org