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annotate loadtools/README @ 100:02ece4d8c755

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pirexplore: beginning of FFS support
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 01 Sep 2013 21:55:51 +0000
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97
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1 You are looking at the source for the FreeCalypso loadtools package. You may
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2 have downloaded it either as a separate package or as part of the larger
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3 freecalypso-sw suite.
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4
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5 The tools in this package are written to run on some Unix/Linux machine
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6 (normally a PC/Linux desktop or laptop) that acts as a host for operating on
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7 Calypso target devices. All of these tools communicate with the Calypso target
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8 through a serial port; each tool begins its operation by sending special byte
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9 sequences to this serial port which are designed to interrupt the Calypso
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10 device boot process in the ROM bootloader.
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11
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12 Three utilities are currently built as part of FreeCalypso loadtools:
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13
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14 fc-iram & fc-xram These utilities are intended for FreeCalypso developers
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15 only. They load an S-record code image into IRAM or
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16 XRAM, respectively, induce a transfer of control to the
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17 loaded code, and then drop into a serial line pass-thru
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18 mode for the operator to interact with the thus loaded
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19 target code.
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20
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21 fc-loadtool This utility is intended for both developers and end
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22 users. After establishing communication with the
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23 target, fc-loadtool drops into interactive operation.
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24 Once at the loadtool> prompt, you can peek and poke
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25 registers, and most importantly, dump (read) and load
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26 (program) the flash memory of the target device.
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27
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28 Loadagent
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29
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30 Both fc-loadtool and fc-xram work by first feeding a FreeCalypso-developed
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31 program called loadagent to the Calypso ROM bootloader; all further operations
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32 (loading code into XRAM or flash) are done via this loadagent. An S-record
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33 image of the loadagent program is required for fc-loadtool and fc-xram to work.
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34 That program is in turn built with the ARM7 toolchain.
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35
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36 If you are working with the full freecalypso-sw suite, you presumably already
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37 have the proper ARM7 toolchain built and installed. To build loadagent, simply
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38 run 'make' in the ../target-utils tree.
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39
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40 If you have downloaded a separately-packaged version of FreeCalypso loadtools,
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41 the package should have a prebuilt loadagent.srec image included, sparing
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42 non-developer users the nontrivial hurdle of having to build and install a
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43 special cross-compilation toolchain. The same loadagent binary is designed to
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44 work on all supported Calypso targets.
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45
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46 Building and installing loadtools
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47
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48 Normally the machine on which you build and install fc-loadtools would be your
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49 PC/Linux desktop or laptop, the system you would use to program or otherwise
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50 interact with Calypso phones by way of appropriate USB-to-phone cables. Just
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51 like loadagent, the host utilities you are going to build and install aren't
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52 specific to a particular target device; instead you will select the target
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53 device at run time via a command line option. Hence you can build and install
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54 the host utilities (usual 'make' and 'make install') without limiting your
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55 setup to just one target phone type.
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56
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57 However, if your intended target device is an Openmoko GTA02 (or GTA01)
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58 smartphone, there is one additional complication: one cannot directly access
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59 the Calypso part of these phones from the outside without going through the
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60 phone's application processor first. If you would like to use fc-loadtool to
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61 read or write the GSM flash memory of your GTA0x (load a different firmware
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62 image, dump the flash file system for backup or examination, restore a previous
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63 backup etc), there are two ways to do it:
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64
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65 1. The recommended way for FreeCalypso developers is to get a special serial
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66 cable (low voltage, as in 3.3V or lower - *NOT* RS-232 levels - please don't
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67 fry your precious phone!) that would plug into the 2.5mm jack on the left
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68 side of the phone that is normally intended for a wired headset. This way
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69 you can use your regular build of fc-loadtool (and fc-iram & fc-xram) on
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70 your PC/Linux (or other) development host, no need to build anything for
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71 GTA0x AP, and all communication happens directly between your development
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72 host and the Calypso part of your target phone - not going through the AP
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73 at all. You still need working software on the GTA0x AP to do battery
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74 management, to power the Calypso block on and off, and to enable the headset
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75 jack "download" path, but it is much less burdensome than having to do the
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76 actual FreeCalypso work from the AP.
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77
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78 2. If you are an end user who simply wishes to reflash a different GSM firmware
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79 image, it can be done from inside the phone (from the AP) without having to
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80 acquire special hardware (as in the cable described above). However, the
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81 trade-off is that in return for saving on the special hardware, you have to
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82 do more work on the software. You will have to use a cross-compiler
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83 targeting the ARM/Linux AP environment (*not* the ARM7 cross-compiler used
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84 for the GSM firmware itself!) to build fc-loadtools to run on the GTA0x AP.
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85
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86 Building loadtools for GTA0x AP
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87
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88 If you've decided to build loadtools for the GTA0x AP, you'll need to make the
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89 following modifications to the Makefile:
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90
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91 * Change the CC= line to point to the appropriate cross-compiler (which you'll
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92 need to provide yourself);
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93
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94 * Change the CFLAGS= line: add the right options to target the ARM920T core in
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95 the GTA0x AP (e.g., -march=armv4t -mtune=arm920t), and add -DGTA0x_AP_BUILD
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96 to enable some code that makes sense only when running on the GTA0x AP.
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97
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98 * Change EXTRA_OBJ= to EXTRA_OBJ=gtapower.o, i.e., add gtapower.c (compiling
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99 into gtapower.o) to the build.
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100
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101 See gta-ap-build.sed for an example.
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102
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103 Running fc-loadtool
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104
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105 Once you've got loadtools built and installed, you can run fc-loadtool
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106 as follows:
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107
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108 To operate on a Pirelli DP-L10 that appears as /dev/ttyUSB0:
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109
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110 fc-loadtool -h pirelli /dev/ttyUSB0
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111
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112 To operate on the Calypso block of a GTA02, accessing it from an external
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113 PC/Linux host via a USB-to-headset-jack serial cable that appears as
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114 /dev/ttyUSB0:
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115
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116 fc-loadtool -h gta02 /dev/ttyUSB0
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117
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118 To operate on the Calypso block of a GTA02, running fc-loadtool from inside the
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119 phone, i.e., from the AP of the same GTA02:
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120
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121 fc-loadtool -h gta02 /dev/ttySAC0