fsl/deepsleep: avoid the DDR restore from being optimized out
PATCH 1/1 fsl/deepsleep: avoid the DDR restore from being optimized out
From: Tang Yuantian <[email protected]>
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.
--- board/freescale/common/mpc85xx_sleep.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
board/freescale/common/mpc85xx_sleep.c +4 -4
@@ -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 (); }
Signature · 1 line
2.1.0.27.g96db324
PATCH 1/1 fsl/deepsleep: avoid the DDR restore from being optimized out
Quoted 10 lines · Yuantian.Tang at freescale.com
From: Tang Yuantian <[email protected]>
Function
dp_ddr_restoreis to restore the first 128-byte space of DDR. However those codes may be optimized out by compiler since the destination address is at0x0. In order to avoid compiler optimization, we restore the space from high address, which is not at0x0, to low address.Signed-off-by Tang Yuantian <[email protected]>---
Applied to u-boot-mpc85xx master. Awaiting upstream.
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