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ColdFire: Fix M5253EVB dram bring up issue 

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>
This commit is contained in:
TsiChung Liew 2008-08-06 14:11:36 -05:00 committed by John Rigby
parent 855efd04e4
commit d361307e73
1 changed files with 9 additions and 4 deletions
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13
board/freescale/m5253evbe/m5253evbe.c
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@ -36,8 +36,6 @@ int checkboard(void)
phys_size_t initdram(int board_type)
{
int i;
/*
* Check to see if the SDRAM has already been initialized
* by a run control tool
@ -50,21 +48,27 @@ phys_size_t initdram(int board_type)
/* Initialize DRAM Control Register: DCR */
mbar_writeShort(MCFSIM_DCR, (0x8400 | RC));
asm("nop");
mbar_writeLong(MCFSIM_DACR0, 0x00003224);
mbar_writeLong(MCFSIM_DACR0, 0x00002320);
asm("nop");
/* Initialize DMR0 */
dramsize = ((CFG_SDRAM_SIZE << 20) - 1) & 0xFFFC0000;
mbar_writeLong(MCFSIM_DMR0, dramsize | 1);
asm("nop");
mbar_writeLong(MCFSIM_DACR0, 0x0000322c);
mbar_writeLong(MCFSIM_DACR0, 0x00002328);
asm("nop");
/* Write to this block to initiate precharge */
*(u32 *) (CFG_SDRAM_BASE) = 0xa5a5a5a5;
asm("nop");
/* Set RE bit in DACR */
mbar_writeLong(MCFSIM_DACR0,
mbar_readLong(MCFSIM_DACR0) | 0x8000);
asm("nop");
/* Wait for at least 8 auto refresh cycles to occur */
udelay(500);
@ -72,6 +76,7 @@ phys_size_t initdram(int board_type)
/* Finish the configuration by issuing the MRS */
mbar_writeLong(MCFSIM_DACR0,
mbar_readLong(MCFSIM_DACR0) | 0x0040);
asm("nop");
*(u32 *) (CFG_SDRAM_BASE + 0x800) = 0xa5a5a5a5;
}