[U-Boot] [PATCH 1/4 v2] common/console.c: Drop sandbox special-case console code

[U-Boot] [PATCH 1/4 v2] common/console.c: Drop sandbox special-case console code

[Stefan Roese]

As done in commit da229e4e [sandbox: Drop special-case sandbox console code],
this patch drops the sandbox special-case code in vprintf() that was
missed by Simon at that time.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
---
v2:
- new patch

 common/console.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/common/console.c b/common/console.c
index ace206c..6fd7a10 100644
--- a/common/console.c
+++ b/common/console.c
@@ -559,11 +559,6 @@ int vprintf(const char *fmt, va_list args)
 	uint i;
 	char printbuffer[CONFIG_SYS_PBSIZE];
 
-#if defined(CONFIG_PRE_CONSOLE_BUFFER) && !defined(CONFIG_SANDBOX)
-	if (!gd->have_console)
-		return 0;
-#endif
-
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-- 
2.6.3

[U-Boot] [PATCH 2/4 v2] common/console.c: Small coding style cleanup

[Stefan Roese]

Change some comments to match the U-Boot coding style rules.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
---
v2:
- new patch

 common/console.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/common/console.c b/common/console.c
index 6fd7a10..cf86b76 100644
--- a/common/console.c
+++ b/common/console.c
@@ -543,7 +543,8 @@ int printf(const char *fmt, ...)
 
 	va_start(args, fmt);
 
-	/* For this to work, printbuffer must be larger than
+	/*
+	 * For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
@@ -559,7 +560,8 @@ int vprintf(const char *fmt, va_list args)
 	uint i;
 	char printbuffer[CONFIG_SYS_PBSIZE];
 
-	/* For this to work, printbuffer must be larger than
+	/*
+	 * For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-- 
2.6.3

[U-Boot] [PATCH 3/4 v2] lib/tiny-printf.c: Add tiny printf function for space limited environments

[Stefan Roese]

This patch adds a small printf() version that supports all basic formats.
Its intented to be used in U-Boot SPL versions on platforms with very
limited internal RAM sizes.

To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
will result in the SPL using this tiny function and the main U-Boot
still using the full-blown printf() function.

This code was copied from:
http://www.sparetimelabs.com/printfrevisited
With mostly only coding style related changes so that its checkpatch
clean.

The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
(Marvell AXP) SPL:

Without this patch:
  58963   18536    1928   79427   13643 ./spl/u-boot-spl

With this patch:
  56542   18536    1956   77034   12cea ./spl/u-boot-spl

Note:
To make it possible to compile tiny-printf.c instead of vsprintf.c when
CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
moved from common/console.c into vsprintf.c in this patch.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
---
v2:
- Patch split-up into multiple patches
- Added comment about supported formats in Kconfig

 common/console.c  |  36 ---------------
 lib/Kconfig       |  10 +++++
 lib/Makefile      |   7 ++-
 lib/tiny-printf.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/vsprintf.c    |  36 +++++++++++++++
 5 files changed, 182 insertions(+), 37 deletions(-)
 create mode 100644 lib/tiny-printf.c

diff --git a/common/console.c b/common/console.c
index cf86b76..2bfd59f 100644
--- a/common/console.c
+++ b/common/console.c
@@ -535,42 +535,6 @@ void puts(const char *s)
 	}
 }
 
-int printf(const char *fmt, ...)
-{
-	va_list args;
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	va_start(args, fmt);
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-	va_end(args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
-int vprintf(const char *fmt, va_list args)
-{
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
 /* test if ctrl-c was pressed */
 static int ctrlc_disabled = 0;	/* see disable_ctrl() */
 static int ctrlc_was_pressed = 0;
diff --git a/lib/Kconfig b/lib/Kconfig
index 30e84ed..9d580e4 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -36,6 +36,16 @@ config SYS_VSNPRINTF
 	  Thumb-2, about 420 bytes). Enable this option for safety when
 	  using sprintf() with data you do not control.
 
+config USE_TINY_PRINTF
+	bool "Enable tiny printf() version"
+	help
+	  This option enables a tiny, stripped down printf version.
+	  This should only be used in space limited environments,
+	  like SPL versions with hard memory limits. This version
+	  reduces the code size by about 2.5KiB on armv7.
+
+	  The supported format specifiers are %c, %s, %u/%d and %x.
+
 config REGEX
 	bool "Enable regular expression support"
 	default y if NET
diff --git a/lib/Makefile b/lib/Makefile
index 3eecefa..54b6555 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -79,7 +79,12 @@ obj-y += string.o
 obj-y += time.o
 obj-$(CONFIG_TRACE) += trace.o
 obj-$(CONFIG_LIB_UUID) += uuid.o
-obj-y += vsprintf.o
 obj-$(CONFIG_LIB_RAND) += rand.o
 
+ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_USE_TINY_PRINTF),yy)
+obj-y += tiny-printf.o
+else
+obj-y += vsprintf.o
+endif
+
 subdir-ccflags-$(CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED) += -O2
diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
new file mode 100644
index 0000000..d743a36
--- /dev/null
+++ b/lib/tiny-printf.c
@@ -0,0 +1,130 @@
+/*
+ * Tiny printf version for SPL
+ *
+ * Copied from:
+ * http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
+ *
+ * Copyright (C) 2004,2008  Kustaa Nyholm
+ *
+ * SPDX-License-Identifier:	LGPL-2.1+
+ */
+
+#include <common.h>
+#include <stdarg.h>
+#include <serial.h>
+
+static char *bf;
+static char buf[12];
+static unsigned int num;
+static char uc;
+static char zs;
+
+static void out(char c)
+{
+	*bf++ = c;
+}
+
+static void out_dgt(char dgt)
+{
+	out(dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10));
+	zs = 1;
+}
+
+static void div_out(unsigned int div)
+{
+	unsigned char dgt = 0;
+
+	num &= 0xffff; /* just for testing the code with 32 bit ints */
+	while (num >= div) {
+		num -= div;
+		dgt++;
+	}
+
+	if (zs || dgt > 0)
+		out_dgt(dgt);
+}
+
+int printf(const char *fmt, ...)
+{
+	va_list va;
+	char ch;
+	char *p;
+
+	va_start(va, fmt);
+
+	while ((ch = *(fmt++))) {
+		if (ch != '%') {
+			putc(ch);
+		} else {
+			char lz = 0;
+			char w = 0;
+
+			ch = *(fmt++);
+			if (ch == '0') {
+				ch = *(fmt++);
+				lz = 1;
+			}
+
+			if (ch >= '0' && ch <= '9') {
+				w = 0;
+				while (ch >= '0' && ch <= '9') {
+					w = (((w << 2) + w) << 1) + ch - '0';
+					ch = *fmt++;
+				}
+			}
+			bf = buf;
+			p = bf;
+			zs = 0;
+
+			switch (ch) {
+			case 0:
+				goto abort;
+			case 'u':
+			case 'd':
+				num = va_arg(va, unsigned int);
+				if (ch == 'd' && (int)num < 0) {
+					num = -(int)num;
+					out('-');
+				}
+				div_out(10000);
+				div_out(1000);
+				div_out(100);
+				div_out(10);
+				out_dgt(num);
+				break;
+			case 'x':
+			case 'X':
+				uc = ch == 'X';
+				num = va_arg(va, unsigned int);
+				div_out(0x1000);
+				div_out(0x100);
+				div_out(0x10);
+				out_dgt(num);
+				break;
+			case 'c':
+				out((char)(va_arg(va, int)));
+				break;
+			case 's':
+				p = va_arg(va, char*);
+				break;
+			case '%':
+				out('%');
+			default:
+				break;
+			}
+
+			*bf = 0;
+			bf = p;
+			while (*bf++ && w > 0)
+				w--;
+			while (w-- > 0)
+				putc(lz ? '0' : ' ');
+			while ((ch = *p++))
+				putc(ch);
+		}
+	}
+
+abort:
+	va_end(va);
+	return 0;
+}
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 4c82837..dd8380b 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -861,6 +861,42 @@ int sprintf(char *buf, const char *fmt, ...)
 	return i;
 }
 
+int printf(const char *fmt, ...)
+{
+	va_list args;
+	uint i;
+	char printbuffer[CONFIG_SYS_PBSIZE];
+
+	va_start(args, fmt);
+
+	/*
+	 * For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
+	va_end(args);
+
+	/* Print the string */
+	puts(printbuffer);
+	return i;
+}
+
+int vprintf(const char *fmt, va_list args)
+{
+	uint i;
+	char printbuffer[CONFIG_SYS_PBSIZE];
+
+	/*
+	 * For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
+
+	/* Print the string */
+	puts(printbuffer);
+	return i;
+}
+
 static void panic_finish(void) __attribute__ ((noreturn));
 
 static void panic_finish(void)
-- 
2.6.3

[U-Boot] [PATCH 4/4 v2] lib/tiny-printf.c: Support numbers bigger than 0xffff and misc updates

[Stefan Roese]

With this patch now, the tiny printf() function also supports numbers
bigger than 0xffff. Additionally the code is simplified a bit and
some static variables are moved to function parameters. Also the
upper case hex variable output support is removed, as its not really
needed in this simple printf version. And removing it reduces the
complexity and the code size again a bit.

Here the new numbers, again on the db-mv784mp-gp (Armada XP):

Without this patch:
  56542   18536    1956   77034   12cea ./spl/u-boot-spl

With this patch:
  56446   18536    1936   76918   12c76 ./spl/u-boot-spl

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
---
v2:
- new patch

 lib/tiny-printf.c | 32 ++++++++++++--------------------
 1 file changed, 12 insertions(+), 20 deletions(-)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index d743a36..6766a8f 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -14,9 +14,6 @@
 #include <serial.h>
 
 static char *bf;
-static char buf[12];
-static unsigned int num;
-static char uc;
 static char zs;
 
 static void out(char c)
@@ -26,17 +23,16 @@ static void out(char c)
 
 static void out_dgt(char dgt)
 {
-	out(dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10));
+	out(dgt + (dgt < 10 ? '0' : 'a' - 10));
 	zs = 1;
 }
 
-static void div_out(unsigned int div)
+static void div_out(unsigned int *num, unsigned int div)
 {
 	unsigned char dgt = 0;
 
-	num &= 0xffff; /* just for testing the code with 32 bit ints */
-	while (num >= div) {
-		num -= div;
+	while (*num >= div) {
+		*num -= div;
 		dgt++;
 	}
 
@@ -49,6 +45,9 @@ int printf(const char *fmt, ...)
 	va_list va;
 	char ch;
 	char *p;
+	unsigned int num;
+	char buf[12];
+	unsigned int div;
 
 	va_start(va, fmt);
 
@@ -68,7 +67,7 @@ int printf(const char *fmt, ...)
 			if (ch >= '0' && ch <= '9') {
 				w = 0;
 				while (ch >= '0' && ch <= '9') {
-					w = (((w << 2) + w) << 1) + ch - '0';
+					w = (w * 10) + ch - '0';
 					ch = *fmt++;
 				}
 			}
@@ -86,20 +85,13 @@ int printf(const char *fmt, ...)
 					num = -(int)num;
 					out('-');
 				}
-				div_out(10000);
-				div_out(1000);
-				div_out(100);
-				div_out(10);
-				out_dgt(num);
+				for (div = 1000000000; div; div /= 10)
+					div_out(&num, div);
 				break;
 			case 'x':
-			case 'X':
-				uc = ch == 'X';
 				num = va_arg(va, unsigned int);
-				div_out(0x1000);
-				div_out(0x100);
-				div_out(0x10);
-				out_dgt(num);
+				for (div = 0x10000000; div; div /= 0x10)
+					div_out(&num, div);
 				break;
 			case 'c':
 				out((char)(va_arg(va, int)));
-- 
2.6.3

[U-Boot] [PATCH 1/4 v2] common/console.c: Drop sandbox special-case console code

[Simon Glass]

On 16 November 2015 at 07:26, Stefan Roese <sr@denx.de> wrote:
> As done in commit da229e4e [sandbox: Drop special-case sandbox console code],
> this patch drops the sandbox special-case code in vprintf() that was
> missed by Simon at that time.
>
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> ---
> v2:
> - new patch
>
>  common/console.c | 5 -----
>  1 file changed, 5 deletions(-)

Acked-by: Simon Glass <sjg@chromium.org>

[U-Boot] [PATCH 2/4 v2] common/console.c: Small coding style cleanup

[Simon Glass]

On 16 November 2015 at 07:26, Stefan Roese <sr@denx.de> wrote:
> Change some comments to match the U-Boot coding style rules.
>
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> ---
> v2:
> - new patch
>
>  common/console.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Acked-by: Simon Glass <sjg@chromium.org>

[U-Boot] [PATCH 3/4 v2] lib/tiny-printf.c: Add tiny printf function for space limited environments

[Tom Rini]

On Mon, Nov 16, 2015 at 03:26:33PM +0100, Stefan Roese wrote:

> This patch adds a small printf() version that supports all basic formats.
> Its intented to be used in U-Boot SPL versions on platforms with very
> limited internal RAM sizes.
> 
> To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
> will result in the SPL using this tiny function and the main U-Boot
> still using the full-blown printf() function.
> 
> This code was copied from:
> http://www.sparetimelabs.com/printfrevisited
> With mostly only coding style related changes so that its checkpatch
> clean.
> 
> The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
> (Marvell AXP) SPL:
> 
> Without this patch:
>   58963   18536    1928   79427   13643 ./spl/u-boot-spl
> 
> With this patch:
>   56542   18536    1956   77034   12cea ./spl/u-boot-spl
> 
> Note:
> To make it possible to compile tiny-printf.c instead of vsprintf.c when
> CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
> moved from common/console.c into vsprintf.c in this patch.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Tom Rini <trini@konsulko.com>
> Cc: Albert Aribaud <albert.u.boot@aribaud.net>

This doesn't quite apply now, somehow and my attempt at making it apply
was either somehow wrong, or there's other problems with the series:
+(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) examples/a
pi/vsprintf.o: In function `printf':
+(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) build/../l
ib/vsprintf.c:865: multiple definition of `printf'
+(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) examples/a
pi/libgenwrap.o:build/../examples/api/libgenwrap.c:23: first defined here

And smartweb has a longer and different failure.

-- 
Tom
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[U-Boot] [PATCH 3/4 v2] lib/tiny-printf.c: Add tiny printf function for space limited environments

[Stefan Roese]

Hi Tom,

On 21.11.2015 04:27, Tom Rini wrote:
> On Mon, Nov 16, 2015 at 03:26:33PM +0100, Stefan Roese wrote:
>
>> This patch adds a small printf() version that supports all basic formats.
>> Its intented to be used in U-Boot SPL versions on platforms with very
>> limited internal RAM sizes.
>>
>> To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
>> will result in the SPL using this tiny function and the main U-Boot
>> still using the full-blown printf() function.
>>
>> This code was copied from:
>> http://www.sparetimelabs.com/printfrevisited
>> With mostly only coding style related changes so that its checkpatch
>> clean.
>>
>> The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
>> (Marvell AXP) SPL:
>>
>> Without this patch:
>>    58963   18536    1928   79427   13643 ./spl/u-boot-spl
>>
>> With this patch:
>>    56542   18536    1956   77034   12cea ./spl/u-boot-spl
>>
>> Note:
>> To make it possible to compile tiny-printf.c instead of vsprintf.c when
>> CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
>> moved from common/console.c into vsprintf.c in this patch.
>>
>> Signed-off-by: Stefan Roese <sr@denx.de>
>> Cc: Simon Glass <sjg@chromium.org>
>> Cc: Hans de Goede <hdegoede@redhat.com>
>> Cc: Tom Rini <trini@konsulko.com>
>> Cc: Albert Aribaud <albert.u.boot@aribaud.net>
>
> This doesn't quite apply now, somehow and my attempt at making it apply
> was either somehow wrong, or there's other problems with the series:
> +(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) examples/a
> pi/vsprintf.o: In function `printf':
> +(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) build/../l
> ib/vsprintf.c:865: multiple definition of `printf'
> +(PMC440,lschlv2,zynq_zc702,zynq_zed,zynq_zc706,lsxhl,zynq_picozed,zynq_zybo) examples/a
> pi/libgenwrap.o:build/../examples/api/libgenwrap.c:23: first defined here
>
> And smartweb has a longer and different failure.

Ah, thanks for checking. I hope that I've now fixed all issues with
this tiny-printf implementation. v3 will follow shortly.

Thanks,
Stefan

[U-Boot] [PATCH 3/4 v3] lib/tiny-printf.c: Add tiny printf function for space limited environments

[Stefan Roese]

This patch adds a small printf() version that supports all basic formats.
Its intented to be used in U-Boot SPL versions on platforms with very
limited internal RAM sizes.

To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
will result in the SPL using this tiny function and the main U-Boot
still using the full-blown printf() function.

This code was copied from:
http://www.sparetimelabs.com/printfrevisited
With mostly only coding style related changes so that its checkpatch
clean.

The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
(Marvell AXP) SPL:

Without this patch:
  58963   18536    1928   79427   13643 ./spl/u-boot-spl

With this patch:
  56542   18536    1956   77034   12cea ./spl/u-boot-spl

Note:
To make it possible to compile tiny-printf.c instead of vsprintf.c when
CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
moved from common/console.c into vsprintf.c in this patch.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
---
v3:
- Rebased on latest master
- Only compile files when CONFIG_SPL_SERIAL_SUPPORT is enabled (in SPL case)
- Removed printf() / vprintf() from examples/api/libgenwrap.c as this code
  is now included in vsprintf.c

v2:
- Patch split-up into multiple patches
- Added comment about supported formats in Kconfig

 common/console.c          |  36 -------------
 examples/api/libgenwrap.c |  40 ++------------
 lib/Kconfig               |  10 ++++
 lib/Makefile              |  13 ++++-
 lib/tiny-printf.c         | 130 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/vsprintf.c            |  36 +++++++++++++
 6 files changed, 192 insertions(+), 73 deletions(-)
 create mode 100644 lib/tiny-printf.c

diff --git a/common/console.c b/common/console.c
index 75f84bd..bc37b6d 100644
--- a/common/console.c
+++ b/common/console.c
@@ -558,42 +558,6 @@ void puts(const char *s)
 	}
 }
 
-int printf(const char *fmt, ...)
-{
-	va_list args;
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	va_start(args, fmt);
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-	va_end(args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
-int vprintf(const char *fmt, va_list args)
-{
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
 #ifdef CONFIG_CONSOLE_RECORD
 int console_record_init(void)
 {
diff --git a/examples/api/libgenwrap.c b/examples/api/libgenwrap.c
index c1afa5b..ba51007 100644
--- a/examples/api/libgenwrap.c
+++ b/examples/api/libgenwrap.c
@@ -16,46 +16,14 @@
 
 #include "glue.h"
 
-/*
- * printf() and vprintf() are stolen from u-boot/common/console.c
- */
-int printf (const char *fmt, ...)
-{
-	va_list args;
-	uint i;
-	char printbuffer[256];
-
-	va_start (args, fmt);
-
-	/* For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vsprintf (printbuffer, fmt, args);
-	va_end (args);
-
-	/* Print the string */
-	ub_puts (printbuffer);
-	return i;
-}
-
-int vprintf (const char *fmt, va_list args)
+void putc(const char c)
 {
-	uint i;
-	char printbuffer[256];
-
-	/* For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vsprintf (printbuffer, fmt, args);
-
-	/* Print the string */
-	ub_puts (printbuffer);
-	return i;
+	ub_putc(c);
 }
 
-void putc (const char c)
+void puts(const char *s)
 {
-	ub_putc(c);
+	ub_puts(s);
 }
 
 void __udelay(unsigned long usec)
diff --git a/lib/Kconfig b/lib/Kconfig
index 30e84ed..9d580e4 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -36,6 +36,16 @@ config SYS_VSNPRINTF
 	  Thumb-2, about 420 bytes). Enable this option for safety when
 	  using sprintf() with data you do not control.
 
+config USE_TINY_PRINTF
+	bool "Enable tiny printf() version"
+	help
+	  This option enables a tiny, stripped down printf version.
+	  This should only be used in space limited environments,
+	  like SPL versions with hard memory limits. This version
+	  reduces the code size by about 2.5KiB on armv7.
+
+	  The supported format specifiers are %c, %s, %u/%d and %x.
+
 config REGEX
 	bool "Enable regular expression support"
 	default y if NET
diff --git a/lib/Makefile b/lib/Makefile
index 6c36278..1f1ff6f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -80,7 +80,18 @@ obj-y += string.o
 obj-y += time.o
 obj-$(CONFIG_TRACE) += trace.o
 obj-$(CONFIG_LIB_UUID) += uuid.o
-obj-y += vsprintf.o
 obj-$(CONFIG_LIB_RAND) += rand.o
 
+ifdef CONFIG_SPL_BUILD
+# SPL U-Boot may use full-printf, tiny-printf or none at all
+ifdef CONFIG_USE_TINY_PRINTF
+obj-$(CONFIG_SPL_SERIAL_SUPPORT) += tiny-printf.o
+else
+obj-$(CONFIG_SPL_SERIAL_SUPPORT) += vsprintf.o
+endif
+else
+# Main U-Boot always uses the full printf support
+obj-y += vsprintf.o
+endif
+
 subdir-ccflags-$(CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED) += -O2
diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
new file mode 100644
index 0000000..d743a36
--- /dev/null
+++ b/lib/tiny-printf.c
@@ -0,0 +1,130 @@
+/*
+ * Tiny printf version for SPL
+ *
+ * Copied from:
+ * http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
+ *
+ * Copyright (C) 2004,2008  Kustaa Nyholm
+ *
+ * SPDX-License-Identifier:	LGPL-2.1+
+ */
+
+#include <common.h>
+#include <stdarg.h>
+#include <serial.h>
+
+static char *bf;
+static char buf[12];
+static unsigned int num;
+static char uc;
+static char zs;
+
+static void out(char c)
+{
+	*bf++ = c;
+}
+
+static void out_dgt(char dgt)
+{
+	out(dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10));
+	zs = 1;
+}
+
+static void div_out(unsigned int div)
+{
+	unsigned char dgt = 0;
+
+	num &= 0xffff; /* just for testing the code with 32 bit ints */
+	while (num >= div) {
+		num -= div;
+		dgt++;
+	}
+
+	if (zs || dgt > 0)
+		out_dgt(dgt);
+}
+
+int printf(const char *fmt, ...)
+{
+	va_list va;
+	char ch;
+	char *p;
+
+	va_start(va, fmt);
+
+	while ((ch = *(fmt++))) {
+		if (ch != '%') {
+			putc(ch);
+		} else {
+			char lz = 0;
+			char w = 0;
+
+			ch = *(fmt++);
+			if (ch == '0') {
+				ch = *(fmt++);
+				lz = 1;
+			}
+
+			if (ch >= '0' && ch <= '9') {
+				w = 0;
+				while (ch >= '0' && ch <= '9') {
+					w = (((w << 2) + w) << 1) + ch - '0';
+					ch = *fmt++;
+				}
+			}
+			bf = buf;
+			p = bf;
+			zs = 0;
+
+			switch (ch) {
+			case 0:
+				goto abort;
+			case 'u':
+			case 'd':
+				num = va_arg(va, unsigned int);
+				if (ch == 'd' && (int)num < 0) {
+					num = -(int)num;
+					out('-');
+				}
+				div_out(10000);
+				div_out(1000);
+				div_out(100);
+				div_out(10);
+				out_dgt(num);
+				break;
+			case 'x':
+			case 'X':
+				uc = ch == 'X';
+				num = va_arg(va, unsigned int);
+				div_out(0x1000);
+				div_out(0x100);
+				div_out(0x10);
+				out_dgt(num);
+				break;
+			case 'c':
+				out((char)(va_arg(va, int)));
+				break;
+			case 's':
+				p = va_arg(va, char*);
+				break;
+			case '%':
+				out('%');
+			default:
+				break;
+			}
+
+			*bf = 0;
+			bf = p;
+			while (*bf++ && w > 0)
+				w--;
+			while (w-- > 0)
+				putc(lz ? '0' : ' ');
+			while ((ch = *p++))
+				putc(ch);
+		}
+	}
+
+abort:
+	va_end(va);
+	return 0;
+}
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 4c82837..dd8380b 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -861,6 +861,42 @@ int sprintf(char *buf, const char *fmt, ...)
 	return i;
 }
 
+int printf(const char *fmt, ...)
+{
+	va_list args;
+	uint i;
+	char printbuffer[CONFIG_SYS_PBSIZE];
+
+	va_start(args, fmt);
+
+	/*
+	 * For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
+	va_end(args);
+
+	/* Print the string */
+	puts(printbuffer);
+	return i;
+}
+
+int vprintf(const char *fmt, va_list args)
+{
+	uint i;
+	char printbuffer[CONFIG_SYS_PBSIZE];
+
+	/*
+	 * For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
+
+	/* Print the string */
+	puts(printbuffer);
+	return i;
+}
+
 static void panic_finish(void) __attribute__ ((noreturn));
 
 static void panic_finish(void)
-- 
2.6.3

[U-Boot] [U-Boot, 1/4, v2] common/console.c: Drop sandbox special-case console code

[Tom Rini]

On Mon, Nov 16, 2015 at 03:26:31PM +0100, Stefan Roese wrote:

> As done in commit da229e4e [sandbox: Drop special-case sandbox console code],
> this patch drops the sandbox special-case code in vprintf() that was
> missed by Simon at that time.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> Acked-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 2/4, v2] common/console.c: Small coding style cleanup

[Tom Rini]

On Mon, Nov 16, 2015 at 03:26:32PM +0100, Stefan Roese wrote:

> Change some comments to match the U-Boot coding style rules.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> Acked-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 4/4, v2] lib/tiny-printf.c: Support numbers bigger than 0xffff and misc updates

[Tom Rini]

On Mon, Nov 16, 2015 at 03:26:34PM +0100, Stefan Roese wrote:

> With this patch now, the tiny printf() function also supports numbers
> bigger than 0xffff. Additionally the code is simplified a bit and
> some static variables are moved to function parameters. Also the
> upper case hex variable output support is removed, as its not really
> needed in this simple printf version. And removing it reduces the
> complexity and the code size again a bit.
> 
> Here the new numbers, again on the db-mv784mp-gp (Armada XP):
> 
> Without this patch:
>   56542   18536    1956   77034   12cea ./spl/u-boot-spl
> 
> With this patch:
>   56446   18536    1936   76918   12c76 ./spl/u-boot-spl
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Tom Rini <trini@konsulko.com>
> Cc: Albert Aribaud <albert.u.boot@aribaud.net>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 3/4, v3] lib/tiny-printf.c: Add tiny printf function for space limited environments

[Tom Rini]

On Mon, Nov 23, 2015 at 07:00:22AM +0100, Stefan Roese wrote:

> This patch adds a small printf() version that supports all basic formats.
> Its intented to be used in U-Boot SPL versions on platforms with very
> limited internal RAM sizes.
> 
> To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
> will result in the SPL using this tiny function and the main U-Boot
> still using the full-blown printf() function.
> 
> This code was copied from:
> http://www.sparetimelabs.com/printfrevisited
> With mostly only coding style related changes so that its checkpatch
> clean.
> 
> The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
> (Marvell AXP) SPL:
> 
> Without this patch:
>   58963   18536    1928   79427   13643 ./spl/u-boot-spl
> 
> With this patch:
>   56542   18536    1956   77034   12cea ./spl/u-boot-spl
> 
> Note:
> To make it possible to compile tiny-printf.c instead of vsprintf.c when
> CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
> moved from common/console.c into vsprintf.c in this patch.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Tom Rini <trini@konsulko.com>
> Cc: Albert Aribaud <albert.u.boot@aribaud.net>

Applied to u-boot/master, thanks!

-- 
Tom
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