diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 085e4a095eaaec661ae46a61dda993af3c3cb060..760ed57761749815419f59f47f1948ad5259d0d7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -349,6 +349,11 @@ and is between 256 and 4096 characters. It is defined in the file
 	blkmtd_bs=
 	blkmtd_count=
 
+	boot_delay=	Milliseconds to delay each printk during boot.
+			Values larger than 10 seconds (10000) are changed to
+			no delay (0).
+			Format: integer
+
 	bttv.card=	[HW,V4L] bttv (bt848 + bt878 based grabber cards)
 	bttv.radio=	Most important insmod options are available as
 			kernel args too.
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index e757a74b9d17e53c5bb2fdbb7816f120d849a040..8b080024bbc1fe649770c44b8df540da8ec87d39 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -148,6 +148,8 @@ static inline u64 get_jiffies_64(void)
  */
 #define MAX_JIFFY_OFFSET ((LONG_MAX >> 1)-1)
 
+extern unsigned long preset_lpj;
+
 /*
  * We want to do realistic conversions of time so we need to use the same
  * values the update wall clock code uses as the jiffies size.  This value
diff --git a/init/calibrate.c b/init/calibrate.c
index 40ff3b4048952993ed790b684800d3d36d56106b..2d3d73bd4ce13b18dcbe6d9ebd63efe1cd70c073 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -10,7 +10,7 @@
 
 #include <asm/timex.h>
 
-static unsigned long preset_lpj;
+unsigned long preset_lpj;
 static int __init lpj_setup(char *str)
 {
 	preset_lpj = simple_strtoul(str,NULL,0);
diff --git a/kernel/printk.c b/kernel/printk.c
index 8451dfc31d25b4e0e6903e84a55de230fb5363e2..b2b5c3a22a36b302da177fafae653740f7eeeddf 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -22,6 +22,8 @@
 #include <linux/tty_driver.h>
 #include <linux/console.h>
 #include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/nmi.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/interrupt.h>			/* For in_interrupt() */
@@ -162,6 +164,61 @@ static int __init log_buf_len_setup(char *str)
 
 __setup("log_buf_len=", log_buf_len_setup);
 
+#ifdef CONFIG_BOOT_PRINTK_DELAY
+
+static unsigned int boot_delay; /* msecs delay after each printk during bootup */
+static unsigned long long printk_delay_msec; /* per msec, based on boot_delay */
+
+static int __init boot_delay_setup(char *str)
+{
+	unsigned long lpj;
+	unsigned long long loops_per_msec;
+
+	lpj = preset_lpj ? preset_lpj : 1000000;	/* some guess */
+	loops_per_msec = (unsigned long long)lpj / 1000 * HZ;
+
+	get_option(&str, &boot_delay);
+	if (boot_delay > 10 * 1000)
+		boot_delay = 0;
+
+	printk_delay_msec = loops_per_msec;
+	printk(KERN_DEBUG "boot_delay: %u, preset_lpj: %ld, lpj: %lu, "
+		"HZ: %d, printk_delay_msec: %llu\n",
+		boot_delay, preset_lpj, lpj, HZ, printk_delay_msec);
+	return 1;
+}
+__setup("boot_delay=", boot_delay_setup);
+
+static void boot_delay_msec(void)
+{
+	unsigned long long k;
+	unsigned long timeout;
+
+	if (boot_delay == 0 || system_state != SYSTEM_BOOTING)
+		return;
+
+	k = (unsigned long long)printk_delay_msec * boot_delay;
+
+	timeout = jiffies + msecs_to_jiffies(boot_delay);
+	while (k) {
+		k--;
+		cpu_relax();
+		/*
+		 * use (volatile) jiffies to prevent
+		 * compiler reduction; loop termination via jiffies
+		 * is secondary and may or may not happen.
+		 */
+		if (time_after(jiffies, timeout))
+			break;
+		touch_nmi_watchdog();
+	}
+}
+#else
+static inline void boot_delay_msec(void)
+{
+}
+#endif
+
 /*
  * Commands to do_syslog:
  *
@@ -527,6 +584,8 @@ asmlinkage int vprintk(const char *fmt, va_list args)
 	static char printk_buf[1024];
 	static int log_level_unknown = 1;
 
+	boot_delay_msec();
+
 	preempt_disable();
 	if (unlikely(oops_in_progress) && printk_cpu == smp_processor_id())
 		/* If a crash is occurring during printk() on this CPU,
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 396c38b3cb69f76f90b7882d45c448170eba8044..7d16e64333025db69440fe96b46beb229749e746 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -413,6 +413,24 @@ config FORCED_INLINING
 	  become the default in the future, until then this option is there to
 	  test gcc for this.
 
+config BOOT_PRINTK_DELAY
+	bool "Delay each boot printk message by N milliseconds"
+	depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
+	help
+	  This build option allows you to read kernel boot messages
+	  by inserting a short delay after each one.  The delay is
+	  specified in milliseconds on the kernel command line,
+	  using "boot_delay=N".
+
+	  It is likely that you would also need to use "lpj=M" to preset
+	  the "loops per jiffie" value.
+	  See a previous boot log for the "lpj" value to use for your
+	  system, and then set "lpj=M" before setting "boot_delay=N".
+	  NOTE:  Using this option may adversely affect SMP systems.
+	  I.e., processors other than the first one may not boot up.
+	  BOOT_PRINTK_DELAY also may cause DETECT_SOFTLOCKUP to detect
+	  what it believes to be lockup conditions.
+
 config RCU_TORTURE_TEST
 	tristate "torture tests for RCU"
 	depends on DEBUG_KERNEL