FreeCalypso > hg > freecalypso-citrine

annotate doc/Compiling @ 26:51e1a3b213a3

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started re-adding documentation
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Jun 2016 07:01:34 +0000
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Mychaela Falconia <falcon@freecalypso.org>
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1 Building and installing the ARM7 toolchain
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2 ==========================================
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3
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4 Before you can compile Citrine, you first need to build and install the
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5 necessary toolchain targeting ARM7, the CPU core in the Calypso. The current
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6 "official" GNU ARM toolchain for FreeCalypso consists of binutils-2.21.1,
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7 gcc-4.5.4 and newlib-2.0.0 with a specific set of patches and build
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8 configuration options. All of the necessary bits can be downloaded here:
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9
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10 ftp://ftp.freecalypso.org/pub/GSM/FreeCalypso/toolchain/
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11
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12 Please note: the toolchain that is prescribed for FreeCalypso as above is
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13 *believed* to be equivalent to the one used by OsmocomBB, but there are no
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14 guarantees. Use any other toolchain at your own risk.
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15
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16 Compiling FreeCalypso Citrine firmware
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17 ======================================
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18
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19 Citrine firmware can be built in many different configurations, hence there is
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20 no singular build for it. The configuration choices consist of:
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21
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22 * Which target device the firmware should be built for: the target device
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23 selection is made at compile time; do not attempt to take a firmware image
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24 built for one target device and flash or fc-xram it into another!
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25
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26 * What functionality is to be included. As the FreeCalypso firmware subproject
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27 moves forward, we gradually add chunks of functionality, slowly approaching
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28 what each target device is ultimately capable of. However, each time we add
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29 a new piece of functionality, the ability to build a firmware image that works
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30 like before, without the newly added functionality, still remains. Each
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31 feature to be included needs to be explicitly selected.
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32
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33 * Miscellaneous configuration: which Calypso UART should be used for what,
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34 should the firmware use a real FFS (flash file system) in flash or a fake one
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35 in RAM, etc.
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36
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37 The GSM firmware build configuration is set by way of an editable text file
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38 named build.conf; the configuration and build procedure is as follows:
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39
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40 1. Look at the available repertoire of standard configurations in the configs
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41 directory and choose which one you would like to use, either as-is or as a
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42 basis for your own;
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43
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44 2. Copy the configuration you selected to build.conf in the top level directory
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45 of the source tree;
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46
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47 3. Optionally edit it to taste - the configuration language is Bourne shell;
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48
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49 4. Run 'make' in the top level directory.
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50
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51 Depending on the configuration, either a flashable or a RAM-loadable image will
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52 be built by default. A flashable image will appear in finlink/flashImage.bin;
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53 these images are meant to be programmed with fc-loadtool's flash program-bin
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54 command; the starting flash address at which the image needs to be programmed
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55 depends on the target device - see target-specific notes. A RAM-loadable image
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56 will appear in finlink/ramImage.srec; these images are meant to be loaded and
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57 run with the fc-xram utility.
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58
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59 It is possible to build either a flashable or a RAM-loadable image, or both,
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60 without changing build.conf: run 'make flashImage' or 'make ramImage' as
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61 desired. (The compilation of each module from source into a .o and all
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62 intermediate linking steps are agnostic to whether a flashImage or a ramImage
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63 is being built, only the very final link step differs.) Any otherwise working
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64 configuration can be built into a flashImage, even if it makes no logical sense
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65 to do so, but the ability to build a ramImage for a given configuration depends
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66 on the code image size (which in turn depends on the selected feature set) and
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67 the amount of RAM available on the target in question: most Calypso GSM devices
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68 have small RAM, enough to satisfy a GSM firmware's data space requirements, but
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69 not enough to hold the entire firmware code in RAM as well. Please see target-
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70 specific notes for more details.