[PATCH v4 07/18] ARM64 / ACPI: If we chose to boot from acpi then disable FDT

Hanjun Guo hanjun.guo at linaro.org
Fri Sep 12 07:00:05 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>
Signed-off-by: Hanjun Guo <hanjun.guo 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 5b05227..5796734 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -398,7 +398,8 @@ void __init setup_arch(char **cmdline_p)
 	cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();

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