From patchwork Mon Oct 8 17:44:26 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot, 23/28] powerpc/mpc85xx: Add workaround for DDR erratum A004934 From: York Sun X-Patchwork-Id: 190095 X-Patchwork-Delegate: afleming@freescale.com Message-Id: <1349718271-26503-23-git-send-email-yorksun@freescale.com> To: Cc: afleming@freescale.com Date: Mon, 8 Oct 2012 10:44:26 -0700 After DDR controller is enabled, it performs a calibration for the transmit data vs DQS paths. During this calibration, the DDR controller may make an inaccurate calculation, resulting in a non-optimal tap point. Signed-off-by: York Sun --- arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++ arch/powerpc/cpu/mpc85xx/ddr-gen3.c | 3 +++ arch/powerpc/include/asm/config_mpc85xx.h | 1 + 3 files changed, 7 insertions(+) diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c index 67508ff..4b62651 100644 --- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c +++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c @@ -130,6 +130,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) #ifdef CONFIG_SYS_FSL_ERRATUM_A004510 puts("Work-around for Erratum A004510 enabled\n"); #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A_004934 + puts("Work-around for Erratum A004934 enabled\n"); +#endif return 0; } diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c index 8bed5fe..21840bf 100644 --- a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c +++ b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c @@ -140,6 +140,9 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, out_be32(&ddr->debug[i], regs->debug[i]); } } +#ifdef CONFIG_SYS_FSL_ERRATUM_A_004934 + out_be32(&ddr->debug[28], 0x00003000); +#endif #ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003474 out_be32(&ddr->debug[12], 0x00000015); diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h index 225d620..0bbbf30 100644 --- a/arch/powerpc/include/asm/config_mpc85xx.h +++ b/arch/powerpc/include/asm/config_mpc85xx.h @@ -479,6 +479,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_A004468 +#define CONFIG_SYS_FSL_ERRATUM_A_004934 #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 #elif defined(CONFIG_PPC_B4860)