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| author | Kumar Gala <galak@kernel.crashing.org> | 2011-11-22 06:51:15 -0600 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-11-29 08:48:05 -0600 |
| commit | 43f082bb7fc1c24b32a4abc693869c7d14d42829 (patch) | |
| tree | 93f965962cb64edbac52e2ff28125641a68a9299 /arch/powerpc/cpu/mpc85xx/release.S | |
| parent | a63d9652757605ec5f7104addc5d38bf10ba8671 (diff) | |
| download | u-boot-43f082bb7fc1c24b32a4abc693869c7d14d42829.tar.gz | |
powerpc/85xx: Add workaround for erratum CPU-A003999
Erratum A-003999: Running Floating Point instructions requires special
initialization.
Impact:
Floating point arithmetic operations may result in an incorrect value.
Workaround:
Perform a read modify write to set bit 7 to a 1 in SPR 977 before
executing any floating point arithmetic operation. This bit can be set
when setting MSR[FP], and can be cleared when clearing MSR[FP].
Alternatively, the bit can be set once at boot time, and never cleared.
There will be no performance degradation due to setting this bit.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/cpu/mpc85xx/release.S')
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/release.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S index 6678ed4118..c81e19c0e9 100644 --- a/arch/powerpc/cpu/mpc85xx/release.S +++ b/arch/powerpc/cpu/mpc85xx/release.S @@ -68,6 +68,12 @@ __secondary_start_page: mtspr SPRN_HID1,r3 #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_CPU_A003999 + mfspr r3,977 + oris r3,r3,0x0100 + mtspr 977,r3 +#endif + /* Enable branch prediction */ lis r3,BUCSR_ENABLE@h ori r3,r3,BUCSR_ENABLE@l |