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| author | tang yuantian <Yuantian.Tang@freescale.com> | 2015-09-24 15:52:02 +0800 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2015-10-30 09:19:48 -0700 |
| commit | 0210a3698862801169e3149475174b5268602a93 (patch) | |
| tree | 0e8ab8910e41db60517dbb1fe71318a9aee7334a /board/freescale/ls1021atwr | |
| parent | 6ec9aef2cef311c57652e8d17b09eceac2cebb06 (diff) | |
| download | u-boot-imx-0210a3698862801169e3149475174b5268602a93.zip u-boot-imx-0210a3698862801169e3149475174b5268602a93.tar.gz u-boot-imx-0210a3698862801169e3149475174b5268602a93.tar.bz2 | |
arm: ls1021atwr: optimize the deep sleep latency
It will take more than 1s when wake up from deep sleep. Most of the
time is spent on outputing information. This patch reduced the deep
sleep latency by:
1. avoid outputing system informaton
2. remove flush cache after DDR restore
3. skip reloading second stage uboot binary when SD boot
Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'board/freescale/ls1021atwr')
| -rw-r--r-- | board/freescale/ls1021atwr/ls1021atwr.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c index 445ea24..4918c11 100644 --- a/board/freescale/ls1021atwr/ls1021atwr.c +++ b/board/freescale/ls1021atwr/ls1021atwr.c @@ -436,8 +436,10 @@ int board_early_init_f(void) } #if defined(CONFIG_DEEP_SLEEP) - if (is_warm_boot()) - fsl_dp_disable_console(); + if (is_warm_boot()) { + timer_init(); + dram_init(); + } #endif return 0; @@ -446,6 +448,8 @@ int board_early_init_f(void) #ifdef CONFIG_SPL_BUILD void board_init_f(ulong dummy) { + void (*second_uboot)(void); + /* Clear the BSS */ memset(__bss_start, 0, __bss_end - __bss_start); @@ -466,6 +470,17 @@ void board_init_f(ulong dummy) enable_layerscape_ns_access(); #endif + /* + * if it is woken up from deep sleep, then jump to second + * stage uboot and continue executing without recopying + * it from SD since it has already been reserved in memeory + * in last boot. + */ + if (is_warm_boot()) { + second_uboot = (void (*)(void))CONFIG_SYS_TEXT_BASE; + second_uboot(); + } + board_init_r(NULL, 0); } #endif |