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fsl/deepsleep: avoid the DDR restore from being optimized out 

Function dp_ddr_restore is to restore the first 128-byte space
of DDR. However those codes may be optimized out by compiler
since the destination address is at 0x0. In order to avoid
compiler optimization, we restore the space from high address,
which is not at 0x0, to low address.

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
utp
Tang Yuantian 2015-04-20 11:16:56 +08:00 committed by York Sun
parent 438031e1bc
commit 1a56fcea9f
1 changed files with 4 additions and 4 deletions
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8
board/freescale/common/mpc85xx_sleep.c
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@ -43,16 +43,16 @@ void fsl_dp_disable_console(void)
*/
static void dp_ddr_restore(void)
{
volatile u64 *src, *dst;
u64 *src, *dst;
int i;
struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_MPC85xx_SCFG;
/* get the address of ddr date from SPARECR3 */
src = (u64 *)in_be32(&scfg->sparecr[2]);
dst = (u64 *)CONFIG_SYS_SDRAM_BASE;
src = (u64 *)(in_be32(&scfg->sparecr[2]) + DDR_BUFF_LEN - 8);
dst = (u64 *)(CONFIG_SYS_SDRAM_BASE + DDR_BUFF_LEN - 8);
for (i = 0; i < DDR_BUFF_LEN / 8; i++)
*dst++ = *src++;
*dst-- = *src--;
flush_dcache();
}