diff options
| author | Vicente Olivert Riera <Vincent.Riera@imgtec.com> | 2016-11-09 16:16:57 +0000 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2016-11-09 21:36:34 +0100 |
| commit | 240564a6933d9300473b5ced02d2f6f2a2fa4cd9 (patch) | |
| tree | 041f93eeb38b46cceed6872a6160b88397d45988 /toolchain | |
| parent | d13b1ce707fb609e53164e1ae4281e1e3e7c84ac (diff) | |
arch/Config.in.mips: add support for XBurst cores
The Ingenic XBurst is a MIPS32R2 microprocessor.
It has a bug in the FPU that can generate incorrect results in certain
cases. The problem shows up when you have several fused madd
instructions in sequence with dependant operands.
Using the -mno-fused-madd option prevents gcc from emitting these
instructions. This patch adds changes to the toolchain wrapper to use
that option.
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'toolchain')
| -rw-r--r-- | toolchain/toolchain-wrapper.c | 3 | ||||
| -rw-r--r-- | toolchain/toolchain-wrapper.mk | 5 |
2 files changed, 8 insertions, 0 deletions
diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c index 925d01394..d59629b04 100644 --- a/toolchain/toolchain-wrapper.c +++ b/toolchain/toolchain-wrapper.c @@ -66,6 +66,9 @@ static char *predef_args[] = { #ifdef BR_OMIT_LOCK_PREFIX "-Wa,-momit-lock-prefix=yes", #endif +#ifdef BR_NO_FUSED_MADD + "-mno-fused-madd", +#endif #ifdef BR_BINFMT_FLAT "-Wl,-elf2flt", #endif diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk index e7aa5fb82..c7b50195d 100644 --- a/toolchain/toolchain-wrapper.mk +++ b/toolchain/toolchain-wrapper.mk @@ -26,6 +26,11 @@ ifeq ($(BR2_x86_x1000),y) TOOLCHAIN_WRAPPER_ARGS += -DBR_OMIT_LOCK_PREFIX endif +# Avoid FPU bug on XBurst CPUs +ifeq ($(BR2_mips_xburst),y) +TOOLCHAIN_WRAPPER_ARGS += -DBR_NO_FUSED_MADD +endif + ifeq ($(BR2_CCACHE_USE_BASEDIR),y) TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE_BASEDIR='"$(BASE_DIR)"' endif |