From 1a56fcea9f47ce9184f4dafd3e856de2d85d47cd Mon Sep 17 00:00:00 2001 From: Tang Yuantian Date: Mon, 20 Apr 2015 11:16:56 +0800 Subject: [PATCH] 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 Reviewed-by: York Sun --- board/freescale/common/mpc85xx_sleep.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/board/freescale/common/mpc85xx_sleep.c b/board/freescale/common/mpc85xx_sleep.c index 9e4132c64e..e9cbd515a1 100644 --- a/board/freescale/common/mpc85xx_sleep.c +++ b/board/freescale/common/mpc85xx_sleep.c @@ -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(); } -- 2.39.5