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ColdFire:Add mb for 5253 dram initialization

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The dram initialization sequence should be in order.
This patch add mb for the dram intialization code to make
sure the compiler do not disorder the code.

Signed-off-by: Jason Jin <Jason.jin@freescale.com>
This commit is contained in:
Jason Jin 2011-04-18 17:54:04 +08:00 committed by jason
parent f73e7d67ed
commit 6752da6b26
2 changed files with 6 additions and 0 deletions
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2
arch/m68k/include/asm/io.h
View File

@ -81,6 +81,8 @@
#define outl(val, port) out_le32((u32 *)((port)+_IO_BASE), (val))
#endif
#define mb() __asm__ __volatile__ ("" : : : "memory")
extern inline void _insb(volatile u8 * port, void *buf, int ns)
{
u8 *data = (u8 *) buf;

4
board/freescale/m5253demo/m5253demo.c
View File

@ -27,6 +27,7 @@
#include <common.h>
#include <asm/immap.h>
#include <netdev.h>
#include <asm/io.h>
int checkboard(void)
{
@ -63,10 +64,12 @@ phys_size_t initdram(int board_type)
__asm__("nop");
mbar_writeLong(MCFSIM_DACR0, 0x0000322c);
mb();
__asm__("nop");
/* Write to this block to initiate precharge */
*(u32 *) (CONFIG_SYS_SDRAM_BASE) = 0xa5a5a5a5;
mb();
__asm__("nop");
/* Set RE bit in DACR */
@ -83,6 +86,7 @@ phys_size_t initdram(int board_type)
__asm__("nop");
*(u32 *) (CONFIG_SYS_SDRAM_BASE + 0x800) = 0xa5a5a5a5;
mb();
}
return dramsize;