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Since commitde39dc7162
("arm: armv7-a: Compile and tune for armv7-a instead of armv5") is used -march=armv7-a option for Omap3 platforms. With directive ".arch_extension sec" it is possible for -march=armv7-a to directly use ARM SMC instruction. So enable ".arch_extension sec" in Omap3 lowlevel_init.S and replace hand assembled ".word 0xe1600071" by "SMC #1". Since commit51d0638650
("arm: omap-common: add secure smc entry") same pattern is already used in arch/arm/cpu/armv7/omap-common/lowlevel_init.S. Signed-off-by: Pali Rohár <pali@kernel.org>