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annotate doc/Target-boot-control @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents f19d12f5756f
children b0b6966fa62e
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1 There is a new feature in loadtools (fc-loadtool & friends) and rvinterf as of
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2 fc-host-tools-r12, actually functional as of fc-host-tools-r14: target boot
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3 control. In a typical development environment where FC host tools run on a
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4 general-purpose PC or laptop and communicate with various Calypso targets via
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5 general-purpose serial or USB-serial ports, adapters and cables, there is
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6 generally no way for the host computer running FC host tools to directly command
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7 the Calypso target to power on and/or reboot - instead such control must be
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8 performed "out of band" by the operator pressing the PWON or RESET button on
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9 the target device; some targets may even require complex battery manipulations.
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10 However, there may be more elaborate (less casual) setups where FC host tools
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11 run on a special kind of host system which does have some means to directly
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12 control power and reset to an associated Calypso target:
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13
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14 * Our new FreeCalypso DUART28 adapter available as of 2020-09 has an optional
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15 provision (requires additional wire connections and a custom patch to Linux
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16 kernel ftdi_sio driver) for controlling Calypso target board PWON and RESET
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17 with otherwise unused secondary channel RTS and DTR outputs - see the new
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18 DUART28-boot-control article for the details.
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19
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20 * The Mother has a plan to produce another custom FT2232D-based adapter called
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21 FC-UJA, standing for FreeCalypso UART+JTAG Adapter. This FC-UJA will be a
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22 special FT2232D adapter whose Channel A will operate in MPSSE mode, connecting
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23 to the Calypso target's JTAG and nTESTRESET signals, whereas Channel B will
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24 act as a standard UART, i.e., a ttyUSB device. This FC-UJA needs to be built
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25 as a prerequisite before embarking on the ambitious HSMBP (Handset Motherboard
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26 Prototype) project, as the special adapter will be required for working with
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27 the HSMBP in development. When FC-UJA becomes a reality, FC host tools
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28 running on a development host with this adapter will need to be given the
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29 ability to issue nTESTRESET pulses to the target through the adapter's
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30 MPSSE+GPIO channel; this nTESTRESET pulse will cause the Calypso target to
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31 deep-reset, power on and boot.
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32
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33 * FC host tools (particularly fc-loadtool) may run on the application processor
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34 of a smartphone such as Openmoko GTA02. In such environments the AP will have
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35 special ad hoc control signals (typically GPIOs) to the modem, at the minimum
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36 controlling the modem's PWON line. OM GTA02 added an overriding control of
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37 overall power to the modem; other designs may reasonably add control of the
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38 modem's RESET line.
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39
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40 * There may be special commercial applications in which one or more Calypso
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41 modems are subservient to a control processor that acts similarly to the AP
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42 of a smartphone, with that control processor not only communicating with its
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43 slave modems via UARTs, but also controlling their power and reset.
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44
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45 Where does the desire for target boot control in loadtools and rvinterf come
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46 from? Consider the conventional usage model where no target boot control
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47 exists: you first run fc-loadtool or fc-iram or fc-xram or rvinterf on your
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48 target /dev/ttyXXX, then press the PWON or RESET button on the target. Now
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49 suppose that the finger-actuated button has been replaced with some magic
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50 command that can be executed on the host system to produce the same effect -
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51 now what? If the usage model stays the same, then you have to first run your
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52 fc-loadtool or fc-iram or fc-xram or rvinterf command same as before, then as
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53 it sits there waiting for the target to boot, you have to open another terminal
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54 window, get another ssh session into the system or whatever, and run the magic
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55 command that replaces the manual button press. Very cumbersome, hence the
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56 desire for a better way.
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57
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58 Support for target boot control in FC host tools consists of a new -P option
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59 implemented in all of loadtools programs and in rvinterf, as well as a special
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60 configuration file which needs to be manually created if external boot control
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61 commands are to be used. There are two target boot control models, built-in
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62 and external:
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63
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64 * Built-in target boot control integrated into FC host tools themselves is
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65 currently available only for the DTR/RTS pulsing method implemented on our
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66 DUART28 adapter: -Pdtr means pulse DTR and -Prts means pulse RTS. Please
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67 refer to the DUART28-boot-control article for the details.
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68
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69 * In the other case of external boot control commands, there exist one or more
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70 "magic commands": a magic command is any shell command (anything that can be
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71 passed to /bin/sh -c) whose execution causes a connected Calypso target device
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72 to power on and boot. Naturally these commands will be very specific to your
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73 custom system; they are NOT part of FC host tools!
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74
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75 * These magic commands may be long, and requiring the user to include each magic
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76 command in full on fc-loadtool, rvinterf etc invokation lines is undesirable.
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77 To save typing, we associate a short name (which you choose yourself as you
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78 see fit) with each magic command, and we have a configuration file (which you
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79 need to create) that defines the mapping.
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80
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81 * The argument to the new -P option is the short name to be looked up in the
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82 configuration file. (Built-in boot control names 'dtr' and 'rts' are reserved
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83 and cannot be used for external boot control commands.)
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84
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85 The configuration file needs to be created in /opt/freecalypso/bootctrl.conf;
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86 let us illustrate it with some examples.
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87
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88 Example 1: FC-UJA
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89 =================
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90
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91 When FC-UJA becomes a reality, there will be a program called fc-testreset that
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92 will locate the attached FC-UJA by its USB ID, connect to FT2232D Channel A and
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93 generate the desired reset pulse on its output. The configuration in
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94 /opt/freecalypso/bootctrl.conf may look as follows:
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95
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96 uja fc-testreset
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97
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98 This configuration associates boot control name 'uja' with shell command
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99 fc-testreset. A developer would then run fc-loadtool like this:
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100
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101 fc-loadtool -h fcfam -Puja /dev/ttyUSB0
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102
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103 if ttyUSB0 is where FC-UJA's UART channel ended up. fc-loadtool would run
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104 normally, sending beacons to /dev/ttyUSB0 and waiting for a Calypso boot ROM
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105 response, but it would also execute the fc-testreset command listed in the
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106 configuration file, and if everything is connected correctly, the resulting
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107 nTESTRESET pulse will cause the target to boot.
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108
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109 The possibility of a single host talking to multiple Calypso targets is fully
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110 supported: if you have multiple FC-UJA adapters with different USB descriptor
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111 serial numbers programmed in their EEPROMs connected to respective Calypso
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112 targets, you could have a /opt/freecalypso/bootctrl.conf setup like this:
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113
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114 uja1 fc-testreset -d serial1
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115 uja2 fc-testreset -d serial2
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116
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117 and then run fc-loadtool accordingly:
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118
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119 fc-loadtool -h fcfam -Puja1 /dev/ttyUSB3
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120 fc-loadtool -h fcfam -Puja2 /dev/ttyUSB4
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121
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122 Example 2: Openmoko GTA02
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123 =========================
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124
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125 There is a modem-power-ctrl.sh script provided in the openmoko directory of this
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126 FC host tools package; if you are going to run fc-loadtool on the application
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127 processor of your GTA02 smartphone, you should install this script in some
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128 sensible location such as /usr/local/sbin/modem-power-ctrl. Then fill in your
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129 /opt/freecalypso/bootctrl.conf file as follows:
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130
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131 lm /usr/local/sbin/modem-power-ctrl boot
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132
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133 The name 'lm' stands for "local modem"; you can then run fc-loadtool as follows:
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134
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135 fc-loadtool -h fic -Plm /dev/ttySAC0
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136
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137 Change from the past
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138 ====================
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139
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140 Back in 2013 the predecessor to our current FC host tools package was just
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141 loadtools, and we had a special configuration for building our loadtools to run
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142 on the GTA02 AP. But it worked backwards relative to our current arrangement:
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143 the current sensible arrangement is that a tool like fc-loadtool run without
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144 any special options simply operates on the specified serial port without any
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145 special magic, and if special magic is desired, it needs to be requested
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146 explicitly with the new -P option; the old loadtools-on-GTA02-AP arrangement
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147 was the opposite: you needed to specify -n to get "regular" operation, otherwise
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148 the tools would automatically operate the modem power control.
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149
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150 Now that we support many more different Calypso hardware targets than we even
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151 knew about in 2013-2014, a cleanup has been long overdue. The new arrangement
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152 as of fc-host-tools-r12 cleans up the mess in several ways:
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153
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154 * Our FC host tools package has grown so much that making special code
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155 configurations for special environments like the AP of some particular
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156 smartphone is no longer scalable; now we just have one standard FC host tools
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157 package without platform-specific hacks.
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158
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159 * Openmoko platform was certainly very special to us once, but it is not so
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160 special any more - now we just treat it the same as any other. Our target
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161 boot control mechanism has now been generalized from just OM GTA02 to any
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162 arbitrary platform with similar needs.
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163
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164 * No more reversal of the standard tool paradigm: we have standard operation by
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165 default, magic on request with an option.