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More comments on the whole unaligned access mess on FW 2.x. Don't even

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think about setting the alignment trap to a mode that includes warn,
that simply kills the performance because of the storm of faults the
syslog gets...
This commit is contained in:
NiLuJe
2012-10-03 16:07:03 +02:00
committed by Qingping Hou
parent 42e66cc605
commit d60504ef83
1 changed files with 3 additions and 1 deletions
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4
Makefile
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@@ -36,7 +36,9 @@ BASE_CFLAGS:=-O2 -ffast-math -pipe -fomit-frame-pointer
# Use this for debugging:
#BASE_CFLAGS:=-O0 -g
# Misc GCC tricks to ensure backward compatibility with the K2, even when using a fairly recent TC (Linaro/MG).
# NOTE: -mno-unaligned-access is needed for Linaro 4.6/4.7 and GCC 4.7 TC, or weird crap happens on FW 2.x. We unfortunately can't set it by default, since it's a new flag.
# NOTE: -mno-unaligned-access is needed for TC based on Linaro 4.6/4.7 or GCC 4.7, or weird crap happens on FW 2.x. We unfortunately can't set it by default, since it's a new flag.
# A possible workaround would be to set the alignment trap to fixup (echo 2 > /proc/cpu/alignment) in the launch script, but that's terribly ugly, and might severly nerf performance...
# That said, MG 2012.03 is still using GCC 4.6.3, so we're good ;).
ARM_BACKWARD_COMPAT_CFLAGS:=-fno-stack-protector -U_FORTIFY_SOURCE -D_GNU_SOURCE -fno-finite-math-only
ARM_BACKWARD_COMPAT_CXXFLAGS:=-fno-use-cxa-atexit
ARM_ARCH:=-march=armv6j -mtune=arm1136jf-s -mfpu=vfp -mfloat-abi=softfp -marm