u-boot.git/tools/Makefile, branch v2017.09-rc2

MIPS: Stop building position independent code

2017-07-25T18:44:00+00:00

U-Boot has up until now built with -fpic for the MIPS architecture,
producing position independent code which uses indirection through a
global offset table, making relocation fairly straightforward as it
simply involves patching up GOT entries.

Using -fpic does however have some downsides. The biggest of these is
that generated code is bloated in various ways. For example, function
calls are indirected through the GOT & the t9 register:

  8f998064   lw     t9,-32668(gp)
  0320f809   jalr   t9

Without -fpic the call is simply:

  0f803f01   jal    be00fc04 

This is more compact & faster (due to the lack of the load & the
dependency the jump has on its result). It is also easier to read &
debug because the disassembly shows what function is being called,
rather than just an offset from gp which would then have to be looked up
in the ELF to discover the target function.

Another disadvantage of -fpic is that each function begins with a
sequence to calculate the value of the gp register, for example:

  3c1c0004   lui    gp,0x4
  279c3384   addiu  gp,gp,13188
  0399e021   addu   gp,gp,t9

Without using -fpic this sequence no longer appears at the start of each
function, reducing code size considerably.

This patch switches U-Boot from building with -fpic to building with
-fno-pic, in order to gain the benefits described above. The cost of
this is an extra step during the build process to extract relocation
data from the ELF & write it into a new .rel section in a compact
format, plus the added complexity of dealing with multiple types of
relocation rather than the single type that applied to the GOT. The
benefit is smaller, cleaner, more debuggable code. The relocate_code()
function is reimplemented in C to handle the new relocation scheme,
which also makes it easier to read & debug.

Taking maltael_defconfig as an example the size of u-boot.bin built
using the Codescape MIPS 2016.05-06 toolchain (gcc 4.9.2, binutils
2.24.90) shrinks from 254KiB to 224KiB.

Signed-off-by: Paul Burton 
Cc: Daniel Schwierzeck 
Cc: u-boot@lists.denx.de
Reviewed-by: Daniel Schwierzeck 
Tested-by: Daniel Schwierzeck

dtc: mkimage: Add the possibility to specify DTC

2017-07-22T19:36:19+00:00

FreeBSD recently switch to it's BSDL dtc. While it support most of the
features of the GPL one it still lacks the incbin directive.
Add the possibility to specify which dtc we want to use for compiling dts
and generating fit image.

Signed-off-by: Emmanuel Vadot 
Acked-by: Simon Glass

fdt: Stop building the old python libfdt module

2017-06-02T16:18:19+00:00

This is no-longer needed, so stop building it.

Signed-off-by: Simon Glass

fdt: Build the new python libfdt module

2017-06-02T16:16:47+00:00

Build the upstream python libfdt module. At present the legacy module is
still built and is the one that it used. Future work will switch this
over.

Signed-off-by: Simon Glass

fdt: Rename existing python libfdt module

2017-06-02T16:16:47+00:00

Now that this module has been accepted upstream we should stop using the
local U-Boot one. In preparation for this, rename it to indicate it is for
legacy use.

Signed-off-by: Simon Glass

fdt: Add all source files to the libfdt build

2017-06-02T16:16:47+00:00

At present only a subset of source files are build. Add the rest and
refactor this so that a source file list is available also. This will be
used in later commit.

Signed-off-by: Simon Glass

tools: allow to override python

2017-04-13T20:44:49+00:00

Not force to use python from PATH. Issue was noted when building with
Yocto, because python from the distro is always taken instead of
python-native built during Yocto process.

Signed-off-by: Stefano Babic 
CC: Simon Glass 
Reviewed-by: Simon Glass

tools: sunxi: Add spl image builder

2017-04-07T05:53:45+00:00

This program generates raw SPL images that can be flashed on the NAND with
the ECC and randomizer properly set up.

This has been copied (and tweaked to find the right headers) from the
sunxi-tools (https://github.com/linux-sunxi/sunxi-tools) upstream
repository, commit 1c3a6ca5.

Signed-off-by: Maxime Ripard 
Acked-by: Boris Brezillon 
Reviewed-by: Hans de Goede 
Reviewed-by: Jagan Teki

Pass empty CFLAGS on invocation of libfdt/setup.py

2017-03-20T22:04:43+00:00

When building u-boot tools in cross-build environment CFLAGS environment
variable set up for target is taken into an account when building code
for host. Make it empty on invocation of python.

This fixes the following build errors when cross-compiling for xtensa:

  cc1: error: unrecognized command line option "-mlongcalls"
  cc1: error: unrecognized command line option "-mauto-litpools"

Signed-off-by: Max Filippov 
Reviewed-by: Simon Glass 
Reviewed-by: Tom Rini

tools: fix cross-compiling tools when HOSTCC is overridden

2017-03-15T00:40:22+00:00

Richard reported U-Boot tools issues in OpenEmbedded/Yocto project.

OE needs to be able to change the default compiler. If we pass in
HOSTCC through the make command, it overwrites all HOSTCC instances,
including ones in tools/Makefile and tools/env/Makefile, which breaks
"make cross_tools" and "make env", respectively.

Add "override" directives to avoid overriding HOSTCC instances that
really need to point to the cross-compiler.

Signed-off-by: Masahiro Yamada 
Reported-by: Richard Purdie 
Reviewed-by: Simon Glass