使用如下patch,关闭串口打印,可以至少节省几百ms的时间。
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diff --git a/arch/arm64/configs/xxx_defconfig b/arch/arm64/configs/xxx_defconfig index c8036df..81275fa 100755
@@ -2985,6 +2985,7 @@ CONFIG_PRINTK_TIME=y CONFIG_MESSAGE_LOGLEVEL_DEFAULT=4 # CONFIG_BOOT_PRINTK_DELAY is not set # CONFIG_DYNAMIC_DEBUG is not set +CONFIG_PRINTK_NOT_OUTPUT=y # # Compile-time checks and compiler options diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 98ee2a3..e997ad7 100755
@@ -1568,7 +1568,7 @@ static void call_console_drivers(int level, if (!console_drivers) return; - +#ifdef CONFIG_PRINTK_NOT_OUTPUT for_each_console(con) { if (exclusive_console && con != exclusive_console) continue; @@ -1584,6 +1584,7 @@ static void call_console_drivers(int level, else con->write(con, text, len); } +#endif }
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