diff options
| author | TsiChung Liew <tsicliew@gmail.com> | 2010-03-10 16:14:01 -0600 |
|---|---|---|
| committer | TsiChung Liew <tsicliew@gmail.com> | 2010-03-24 11:09:15 -0500 |
| commit | 53e4290f20b5f73c95717f47f4c04ed6932ff931 (patch) | |
| tree | ba1daf034535b500a298aa53c54bf14a0b0eebf2 /board | |
| parent | ac265f7fcab1a09b9a837a34ef8b10acc101695e (diff) | |
ColdFire: M5271EVB DRAM Bring up issue
Fix proper portsize: The register for portsize is either 00b, 01b,
or 1xb. The value that previous assigned is 32d.
Fix DRAM bring up: insert asm("nop") for every DRAM register setup
Signed-off-by: TsiChung Liew <tsicliew@gmail.com>
Diffstat (limited to 'board')
| -rw-r--r-- | board/freescale/m5271evb/m5271evb.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/board/freescale/m5271evb/m5271evb.c b/board/freescale/m5271evb/m5271evb.c index 5505cc42c6..446f102e58 100644 --- a/board/freescale/m5271evb/m5271evb.c +++ b/board/freescale/m5271evb/m5271evb.c @@ -47,6 +47,7 @@ phys_size_t initdram (int board_type) { MCF_GPIO_SDRAM_SDWE | MCF_GPIO_SDRAM_SCAS | MCF_GPIO_SDRAM_SRAS | MCF_GPIO_SDRAM_SCKE | MCF_GPIO_SDRAM_SDCS_11); + asm(" nop"); /* * Check to see if the SDRAM has already been initialized @@ -55,8 +56,9 @@ phys_size_t initdram (int board_type) { if (!(mbar_readLong(MCF_SDRAMC_DACR0) & MCF_SDRAMC_DACRn_RE)) { /* Initialize DRAM Control Register: DCR */ mbar_writeShort(MCF_SDRAMC_DCR, - MCF_SDRAMC_DCR_RTIM(0x01) - | MCF_SDRAMC_DCR_RC(0x30)); + MCF_SDRAMC_DCR_RTIM(2) + | MCF_SDRAMC_DCR_RC(0x2E)); + asm(" nop"); /* * Initialize DACR0 @@ -70,15 +72,18 @@ phys_size_t initdram (int board_type) { | MCF_SDRAMC_DACRn_CASL(1) | MCF_SDRAMC_DACRn_CBM(3) | MCF_SDRAMC_DACRn_PS(0)); + asm(" nop"); /* Initialize DMR0 */ mbar_writeLong(MCF_SDRAMC_DMR0, MCF_SDRAMC_DMRn_BAM_16M | MCF_SDRAMC_DMRn_V); + asm(" nop"); /* Set IP bit in DACR */ mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) | MCF_SDRAMC_DACRn_IP); + asm(" nop"); /* Wait at least 20ns to allow banks to precharge */ for (i = 0; i < 5; i++) @@ -86,6 +91,7 @@ phys_size_t initdram (int board_type) { /* Write to this block to initiate precharge */ *(u32 *)(CONFIG_SYS_SDRAM_BASE) = 0xa5a5a5a5; + asm(" nop"); /* Set RE bit in DACR */ mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) @@ -98,6 +104,7 @@ phys_size_t initdram (int board_type) { /* Finish the configuration by issuing the MRS */ mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) | MCF_SDRAMC_DACRn_MRS); + asm(" nop"); /* * Write to the SDRAM Mode Register A0-A11 = 0x400 @@ -109,6 +116,7 @@ phys_size_t initdram (int board_type) { * Burst Length = 1 */ *(u32 *)(CONFIG_SYS_SDRAM_BASE + 0x400) = 0xa5a5a5a5; + asm(" nop"); } return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024; |