• Stefan Roese's avatar
    lib/tiny-printf.c: Add tiny printf function for space limited environments · 7d9cde10
    Stefan Roese authored
    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: default avatarStefan 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>
    7d9cde10
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