[PATCH v4 12/13] ARM64 / ACPI: if we chose to boot from acpi then disable FDT

Hanjun Guo hanjun.guo at linaro.org
Thu Jun 26 20:49:35 PDT 2014

From: Graeme Gregory <graeme.gregory at linaro.org>

If the early boot methods of acpi are happy that we have valid ACPI
tables and acpi=off has not been passed. Then do not unflat devicetree
effectively disabling further hardware probing from DT.

Signed-off-by: Graeme Gregory <graeme.gregory at linaro.org>
 arch/arm64/kernel/setup.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 9dedb0b..487fd1f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -394,7 +394,8 @@ void __init setup_arch(char **cmdline_p)
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();

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