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BUILDING.md

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Building dm500-satip

Important: Building no longer possible with Ubuntu 16.04 due to upgrade from Make 3.82 to Make 4.1, and also Perl. I was able to build by downgrading these two things, but I strongly recommend using Ubuntu 14.04 (or similar).

Start by installing the necessary tools:

sudo apt-get install build-essential cramfsprogs cramfsswap file coreutils curl

Then download and extract Buildroot at this repository, so that you end with a buildroot-XXXX.XX.X directory next to the config_* files. I used version 2017.05-rc3 but other versions may work as well:

curl https://buildroot.org/downloads/buildroot-2017.05-rc3.tar.gz | tar xz

For convenience, rename buildroot-XXXX.XX.X to just buildroot:

mv buildroot-2017.05-rc3 buildroot

Then supply Buildroot with one of the configuration files, depending on which version you want to build:

cp config_buildroot buildroot/.config         # build regular version
cp config_buildroot_static buildroot/.config  # build static version

At this point, you can cd buildroot and optionally tweak the configuration by doing make menuconfig, make xconfig or whatever method you like.

Compiling

When ready for compiling, you can start building the image by doing (from inside Buildroot's directory):

LANG=C LANGUAGE=C make

The LANG=C LANGUAGE=C is not needed in theory, but we are building old code which may assume that the output of some tools is in English.

And again, because we are building very old code, we will inevitably run into some build errors. The first one I found:

  HOSTCC  scripts/unifdef
scripts/unifdef.c:209:25: error: conflicting types for ‘getline’
 static Linetype         getline(void);
                         ^
In file included from scripts/unifdef.c:70:0:
/usr/include/stdio.h:678:20: note: previous declaration of ‘getline’ was here
 extern _IO_ssize_t getline (char **__restrict __lineptr,
                    ^
make[3]: *** [scripts/unifdef] Error 1
make[2]: *** [__headers] Error 2

This is fixed by editing output/build/linux-headers-2.6.28/scripts/unifdef.c and replacing all three instances of getline with another name, say get_line. After that, issue the LANG=C LANGUAGE=C make command and the build should proceed.

Another error mentions the include/linux/socket.h and some redefinitions of struct iovec. To fix it, edit output/build/linux-headers-2.6.28/usr/include/linux/socket.h and replace the line:

#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)

with just

#if defined(__KERNEL__)

Try again and the build should proceed. If you find more errors, please open an issue on this repo.

When the build has finished, you should have your image at output/images/flash.img, ready to flash with i.e. DreamUp.