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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/Makefile
parentddf7355a73f2e01bd8eec4b939d8749ac22ff574 (diff)
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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/Makefile')
-rw-r--r--lib/Makefile13
1 files changed, 12 insertions, 1 deletions
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