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gsm-fw/L1: fix for the DSP patch corruption bug The L1 code we got from the LoCosto fw contains a feature for DSP CPU load measurement. This feature is a LoCosto-ism, i.e., not applicable to earlier DBB chips (Calypso) with their respective earlier DSP ROMs. Most of the code dealing with that feature is conditionalized as #if (DSP >= 38), but one spot was missed, and the MCU code was writing into an API word dealing with this feature. In TCS211 this DSP API word happens to be used by the DSP code patch, hence that write was corrupting the patched DSP code.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Mon, 19 Oct 2015 17:13:56 +0000
parents 4fa939eada22
children 2d986b8c0e4e
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1 There are 3 parts to the complete FreeCalypso software suite which are built
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2 independently of each other:
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3
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4 * The tools that run on a GNU/Linux PC or other host system are the most
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5 straightforward: there is a top level Makefile (named Makefile.hosttools if
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6 you looking at a development source snapshot, will be renamed to just
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7 Makefile in packaged releases of the host tools) that coordinates building
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8 and installing all of them.
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9
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10 * The gsm-fw tree, which will eventually become our main GSM firmware, needs to
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11 be built with a GNU cross-compiler toolchain for ARM7. This firmware can be
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12 built for several different target devices and with different feature
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13 configurations, hence there is no singular build for it - it's more like the
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14 Linux kernel in terms of its build configuration management.
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15
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16 * We also have a few utilities which need to be compiled to run on Calypso
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17 targets, but which are not part of gsm-fw; they are gathered in the
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18 target-utils tree. They are built with the same GNU toolchain for ARM7 as
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19 gsm-fw, but don't have any fancy configuration system.
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20
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21 Building and installing FreeCalypso host tools
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22 ==============================================
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23
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24 If you are working with a packaged FC host tools release, just run 'make', then
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25 'make install' as root. If you are working with a development source snapshot,
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26 do 'make -f Makefile.hosttools' instead.
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28 The "standard" install directories are /usr/local/bin for binaries and
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29 /usr/local/share/freecalypso for helper files. If you need to change these
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30 paths to something else, you'll need to edit a bunch of individual component
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31 Makefiles, and possibly also some source files like loadtools/defpath.c -
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32 sorry, FreeCalypso is not GNU and does not use autotools.
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33
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34 Building and installing the ARM7 toolchain
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35 ==========================================
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36
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37 The current "official" GNU ARM toolchain for FreeCalypso consists of
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38 binutils-2.21.1, gcc-4.5.4 and newlib-2.0.0 with a specific set of patches and
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39 build configuration options. Build it as follows:
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40
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41 1. Download these 3 source tarballs for the standard GNU+newlib components:
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42
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43 binutils-2.21.1a.tar.bz2
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44 gcc-core-4.5.4.tar.bz2
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45 newlib-2.0.0.tar.gz
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46
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47 2. Run the build+install.sh script in the toolchain directory. Read the
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48 comments in the script first for the usage instructions.
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49
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50 The toolchain thus built will need to be in your PATH before you can compile
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51 gsm-fw or target-utils.
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52
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53 Please note: the toolchain that is prescribed for FreeCalypso as above is
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54 *believed* to be equivalent to the one used by OsmocomBB, but there are no
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55 guarantees. Use any other toolchain at your own risk.
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56
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57 Compiling target-utils
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58 ======================
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59
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60 Running 'make' in the target-utils tree with the ARM7 toolchain present in your
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61 PATH will result in compalstage and loadagent being built; these are the two
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62 components needed in order to use FreeCalypso loadtools. Run 'make install' to
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63 install these target binaries in /usr/local/share/freecalypso, which is where
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64 loadtools will look for them.
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65
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66 Run 'make all' in target-utils to build some other components that aren't
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67 really needed.
864
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68
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69 Compiling FreeCalypso GSM firmware
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70 ==================================
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71
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72 The firmware in our gsm-fw tree can be built in many different configurations,
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73 hence there is no singular build for it. The configuration choices consist of:
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74
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75 * Which target device the firmware should be built for: the target device
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76 selection is made at compile time; do not attempt to take a firmware image
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77 built for one target device and flash or fc-xram it into another!
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78
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79 * What functionality is to be included. As the FreeCalypso firmware subproject
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80 moves forward, we gradually add chunks of functionality, slowly approaching
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81 what each target device is ultimately capable of. However, each time we add
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82 a new piece of functionality, the ability to build a firmware image that works
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83 like before, without the newly added functionality, still remains. Each
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84 feature to be included needs to be explicitly selected.
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85
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86 * Miscellaneous configuration: which Calypso UART should be used for what,
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87 should the firmware use a real FFS (flash file system) in flash or a fake one
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88 in RAM, etc.
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89
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90 The GSM firmware build configuration is set by way of an editable text file
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91 named build.conf; the configuration and build procedure is as follows:
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92
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93 1. Look at the available repertoire of standard configurations under
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94 gsm-fw/configs and choose which one you would like to use, either as-is or
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95 as a basis for your own;
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96
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97 2. Copy the configuration you selected to build.conf in the gsm-fw directory;
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98
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99 3. Optionally edit it to taste - the configuration language is Bourne shell;
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100
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101 4. Run 'make' in the gsm-fw directory.
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102
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103 Depending on the configuration, either a flashable or a RAM-loadable image will
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104 be built by default. A flashable image will appear in finlink/flashImage.bin;
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105 these images are meant to be programmed with fc-loadtool's flash program-bin
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106 command; the starting flash address at which the image needs to be programmed
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107 depends on the target device - see target-specific notes. A RAM-loadable image
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108 will appear in finlink/ramImage.srec; these images are meant to be loaded and
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109 run with the fc-xram utility.
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110
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111 It is possible to build either a flashable or a RAM-loadable image, or both,
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112 without changing build.conf: run 'make flashImage' or 'make ramImage' as
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113 desired. (The compilation of each module from source into a .o and all
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114 intermediate linking steps are agnostic to whether a flashImage or a ramImage
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115 is being built, only the very final link step differs.) Any otherwise working
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116 configuration can be built into a flashImage, even if it makes no logical sense
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117 to do so, but the ability to build a ramImage for a given configuration depends
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118 on the code image size (which in turn depends on the selected feature set) and
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119 the amount of RAM available on the target in question: most Calypso GSM devices
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120 have small RAM, enough to satisfy a GSM firmware's data space requirements, but
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121 not enough to hold the entire firmware code in RAM as well. Please see target-
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122 specific notes for more details.