Commit graph

6 commits

Author SHA1 Message Date
Michael LeMay 0dcd5e9b5a x86: Revise CFLAGS and LDFLAGS for LLVM Clang compatibility
This patch slightly revises CFLAGS and LDFLAGS to specify the
optimization and debugging options and linker script in a way that is
compatible with using Clang as the C compiler and to invoke the linker
(i.e. CC = clang and LD = clang).
2015-12-21 08:06:14 -02:00
Michael LeMay 06e25c487a galileo: Correct README.md to explain how to verify boot with UART
This patch revises README.md to mention the UART support introduced by
earlier patches in the section about verifying that Contiki is
running.  It also revises the serial console setup instructions to
focus on the more thoroughly tested option.
2015-12-21 08:06:14 -02:00
Andre Guedes c9020d95e7 x86: Build release image
This patch adds support for building release images. The main difference
between release images and default images is that the former is optimized
for size while the latter is "optimized" for debugging. To build a release
image, the BUILD_RELEASE variable should be set to 1. For instance, the
following command build a release image from the hello-world application:
$ cd examples/hello-world && make TARGET=galileo BUILD_RELEASE=1

To optimize for size we use the '-Os' option from gcc. This option also
enables the strict aliasing optimization. This generates lots of warning
messages since we use the '-Wall' option and lots of code in core/net/
break the strict-aliasing rules. Some test have shown that the strict
aliasing optimization it not taking effect in the final binary. For that
reasons, this patch manually disables the optimization. Also, the release
image is stripped.

For the sake of comparison, below follows the output from 'wc' and 'size'
for both debugging (default) and release images.

Default image:
$  wc -c hello-world.galileo
71112 hello-world.galileo
$ size hello-world.galileo
   text    data     bss     dec     hex filename
  20379    1188   12808   34375    8647 hello-world.galileo

Release image:
$ wc -c hello-world.galileo
26320 hello-world.galileo
$ size hello-world.galileo
   text    data     bss     dec     hex filename
  18146    1156   12808   32110    7d6e hello-world.galileo
2015-12-21 08:06:14 -02:00
Andre Guedes d3d2b51fa2 galileo: Initial stdio support
This patch introduces the initial support for stdio library in Galileo
platform. For now, only standard output and error are supported. Both
streams use the UART1 device.

Newlib doesn't call open() for stdin, stdout, and stderr which means
that the _write_r call is the first activity the stub will see on
those streams. For that reason, we initialize the UART1 device in
Galileo's platform main() function instead of in open() system call.
2015-12-21 08:06:14 -02:00
Andre Guedes 568f565b3d galileo: Update README.md file
This patch updates the README.md file, including information about the
current device drivers implementations as well as the Contiki APIs
supported.
2015-12-21 08:06:14 -02:00
Andre Guedes e820a8b03b galileo: Add README file
This patch adds a README file which contains general information about
the Intel Galileo board support. The file provides information about
supported features as well as instructions on how to build, run and debug
applications for this platform.
2015-12-21 08:06:14 -02:00