u-boot.git/spl, branch v2014.04-rc2

kbuild: improve Kbuild speed

2014-03-07T15:59:06+00:00

Kbuild brought about many advantages for us but a significant
performance regression was reported by Simon Glass.

After some discussions and analysis, it turned out
its main cause is in $(call cc-option,...).

Historically, U-Boot parses all config.mk
(arch/*/config.mk and board/*/config.mk)
every time descending into subdirectories.
That means cc-options are evaluated over and over again.

$(call cc-option,...) is useful but costly.
So we want to evaluate them only in ./Makefile
and spl/Makefile and export compiler flags.

This commit changes the build system as follows:

  - Modify scripts/Makefile.build to not include config.mk
    Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y,
    cppflags-y.

  - Export many variables
    Going forward, Kbuild will not parse config.mk files
    when it descends into subdirectories.
    If we want to set variables in config.mk and use them
    in subdirectories, they must be exported.

    This is the list of variables to get exported:
      PLATFORM_CPPFLAGS
      CPUDIR
      BOARDDIR
      OBJCOPYFLAGS
      LDFLAGS
      LDFLAGS_FINAL
        (used in nand_spl/board/*/*/Makefile)
      CONFIG_STANDALONE_LOAD_ADDR
        (used in examples/standalone/Makefile)
      SYM_PREFIX
        (used in examples/standalone/Makefile)
      RELFLAGS
        (used in examples/standalone/Makefile)

  - Delete CPPFLAGS
    This variable has been replaced with PLATFORM_CPPFLAGS

  - Copy gcclibdir from example/standalone/Makefile
    to arch/sparc/config.mk
    The reference in CONFIG_STANDALONE_LOAD_ADDR must be
    resolved before it is exported.

Signed-off-by: Masahiro Yamada 
Reported-by: Simon Glass 
Acked-by: Simon Glass 
Tested-by: Simon Glass  [on Sandbox]
Tested-by: Stephen Warren  [on Tegra]

kbuild: add CONFIG_ prefix to USE_PRIVATE_LIBGCC

2014-03-07T15:59:06+00:00

Before this commit, USE_PRIVATE_LIBGCC was defined in
arch-specific config.mk and referenced in
arch/$(ARCH)/lib/Makefile.

We are not happy about parsing config.mk again and again.
We have to keep the same behavior with a different way.

By adding "CONFIG_" prefix, this macro appears
in include/autoconf.mk, include/spl-autoconf.mk.
(And treating USE_PRIVATE_LIBGCC as CONFIG macro
is reasonable enough.)

Tegra SoC family defined USE_PRIVATE_LIBGCC as "yes"
in arch/arm/cpu/arm720t/tegra*/config.mk,
whereas did not define it in arch/arm/cpu/armv7/tegra*/config.mk.

It means Tegra enables PRIVATE_LIBGCC only for SPL.
We can describe the same behavior by adding

  #ifdef CONFIG_SPL_BUILD
  # define CONFIG_USE_PRIVATE_LIBGCC
  #endif

to include/configs/tegra-common.h.

Signed-off-by: Masahiro Yamada 
Cc: Tom Warren 
Cc: Simon Glass 
Acked-by: Stephen Warren

kbuild: consolidate PLATFORM_LIBS

2014-03-04T17:15:30+00:00

We had switched to Kbuild so now we can specify
PLATFORM_LIBS/PLATFORM_LIBGCC with relative path.

Signed-off-by: Masahiro Yamada 
Acked-by: Tom Rini 
Acked-by: Simon Glass 
Tested-by: Simon Glass

kbuild: refactor more IMX image rules

2014-02-25T16:01:29+00:00

This commit avoids generating ./SPL twice.
  - Fist time descending to spl/
  - Second time as a prerequisite of u-boot-with-spl.imx,
    u-boot-with-nand-spl.imx.

Signed-off-by: Masahiro Yamada

kbuild: use shorten logs for IMX images

2014-02-25T16:01:29+00:00

Signed-off-by: Masahiro Yamada

kbuild: use shorten logs for misc targets

2014-02-25T16:01:29+00:00

Signed-off-by: Masahiro Yamada

kbuild: use shorten logs for mkimage rules

2014-02-25T16:01:29+00:00

Signed-off-by: Masahiro Yamada

kbuild: use shorten logs objcopy rules

2014-02-25T16:01:29+00:00

Signed-off-by: Masahiro Yamada

kbuild: Add $(Q) when descending into subdirectories

2014-02-25T16:01:28+00:00

Signed-off-by: Masahiro Yamada 
Acked-by: Simon Glass

kbuild: rename OBJCFLAGS to OBJCOPYFLAGS

2014-02-25T16:01:28+00:00

Rename OBJCFLAGS to OBJCOPYFLAGS beforehand to use
"cmd_objcopy" in scripts/Makefile.lib in an upcoming commit.

Signed-off-by: Masahiro Yamada