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authorStefan Roese <sr@denx.de>2015-11-23 07:00:22 +0100
committerTom Rini <trini@konsulko.com>2015-11-23 10:56:07 -0500
commit7d9cde1031040a4931d6e12da7d9767b7e1d85d4 (patch)
tree902ccb2b9d0212a5f1b4a98eee1dd4b7b4f34d98 /lib/Kconfig
parentddf7355a73f2e01bd8eec4b939d8749ac22ff574 (diff)
lib/tiny-printf.c: Add tiny printf function for space limited environments
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>
Diffstat (limited to 'lib/Kconfig')
-rw-r--r--lib/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 30e84ed315..9d580e4115 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