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lib/tiny-printf.c: Add tiny printf function for space limited environments

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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 commit is contained in:
Stefan Roese 2015-11-23 07:00:22 +01:00 • committed by Tom Rini
parent ddf7355a73
commit 7d9cde1031
6 changed files with 194 additions and 75 deletions
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44
examples/api/libgenwrap.c
View file

@ -16,48 +16,16 @@
#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)
{
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;
}
void putc (const char c)
void putc(const char c)
{
ub_putc(c);
}
void puts(const char *s)
{
ub_puts(s);
}
void __udelay(unsigned long usec)
{
ub_udelay(usec);