diff options
| 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/include | |
| parent | a63d9652757605ec5f7104addc5d38bf10ba8671 (diff) | |
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/include')
| -rw-r--r-- | arch/powerpc/include/asm/config_mpc85xx.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h index 981d639796..f1da82eba0 100644 --- a/arch/powerpc/include/asm/config_mpc85xx.h +++ b/arch/powerpc/include/asm/config_mpc85xx.h @@ -313,6 +313,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P2041) #define CONFIG_MAX_CPUS 4 @@ -331,6 +332,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P3041) #define CONFIG_MAX_CPUS 4 @@ -349,6 +351,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P3060) #define CONFIG_MAX_CPUS 8 @@ -364,6 +367,7 @@ #define CONFIG_SYS_FSL_PCIE_COMPAT "fsl,qoriq-pcie-v2.2" #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 #define CONFIG_SYS_FSL_ERRATUM_DDR_A003 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P4040) #define CONFIG_MAX_CPUS 4 @@ -374,6 +378,7 @@ #define CONFIG_SYS_FSL_TBCLK_DIV 16 #define CONFIG_SYS_FSL_PCIE_COMPAT "fsl,p4080-pcie" #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P4080) #define CONFIG_MAX_CPUS 8 @@ -402,6 +407,7 @@ #define CONFIG_SYS_P4080_ERRATUM_SERDES9 #define CONFIG_SYS_P4080_ERRATUM_SERDES_A001 #define CONFIG_SYS_P4080_ERRATUM_SERDES_A005 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 /* P5010 is single core version of P5020 */ #elif defined(CONFIG_PPC_P5010) |