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doc/Target-utils: ABB support documented
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 16 Jun 2019 05:53:04 +0000
parents aa4f70e36cbd
children 30bec872824a
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1 FreeCalypso target-utils suite
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2 ==============================
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3
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4 We have a suite of standalone programs and specialized code pieces that run on
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5 the Calypso ARM7 processor, but are not regular operational phone or modem
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6 firmware; this suite of code bits is called target-utils, maintained and
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7 distributed together with FreeCalypso host tools. The primary reason for the
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8 coupling between FC host tools and target-utils is that the target-utils suite
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9 provides the loadagent target program for fc-loadtool and fc-xram host tools,
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10 as well as compalstage code pieces needed for operating on Compal phones.
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11
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12 Most programs in the target-utils suite are meant to execute out of RAM
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13 (specifically, the Calypso chip's internal RAM or IRAM for short), loaded and
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14 run via fc-iram or fc-compalram - they are not meant to be flashed. As of this
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15 writing, the following run-from-RAM programs are available:
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16
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17 buzplayer Player for buzzer melodies, used by fc-buzplay
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18 c139explore Mot C139 hardware exploration program
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19 calversion Calypso version ID tool, primarily for the DSP ROM version
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20 helloapp Hello-world program
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21 loadagent Flash manipulation and XRAM loading agent
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22 pirexplore Pirelli DP-L10 hardware exploration program
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23 simtest Low-level exerciser for the SIM interface hardware
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24
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25 Aside from c139explore which is built as a binary to be loaded via fc-compalram
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26 (Compal's bootloader protocol), all of the above programs are built as S-record
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27 images to be loaded via fc-iram. Once loaded via the respective serial code
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28 download protocol, each of the listed programs runs interactively, listening
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29 for and executing commands given over the serial port. The specific set of
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30 available commands is different for each program as relevant to its function,
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31 but the command framework is common across the target-utils suite. The command
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32 interface is text-based, such that each program can be driven manually by a
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33 human operator once fc-iram or fc-compalram has dropped into the tty pass-thru
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34 mode, but this same text-based command interface can also be driven by other
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35 programs: fc-loadtool and fc-xram drive loadagent, and fc-buzplay drives
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36 buzplayer.
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37
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38 Code architecture and execution environment
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39 ===========================================
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40
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41 Our target-utils suite is built with the GNU toolchain (gcc+binutils), not TI's
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42 proprietary TMS470 compiler. Because all of target-utils are meant to run out
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43 of IRAM rather than flash or XRAM, we compile all code in ARM mode (not Thumb),
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44 and we build without interworking support (no -mthumb-interwork): the ARMv4T
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45 architecture implemented by the ARM7TDMI core in the Calypso does not support
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46 penalty-free ARM/Thumb interworking, thus ARM-only code without interworking
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47 support is the most efficient option for execution out of IRAM.
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48
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49 Selection of UART for communication
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50 ===================================
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51
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52 All target-utils programs are interactive, listening for text commands given
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53 over a serial port. But which UART? The Calypso chip has two UARTs, called
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54 MODEM and IrDA in the chip docs - which of the two should be used for host
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55 communication? The answer is a trick original to FreeCalypso: most of our
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56 target-utils programs that are meant to be loaded via fc-iram expect to be
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57 loaded specifically via the Calypso boot ROM and not in some other way, and
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58 they look at some of the IRAM variables left behind by the boot ROM code. The
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59 boot ROM listens on both UARTs for an interrupt-boot sequence, and once it
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60 receives that sequence on one of the UARTs, it remembers which UART it was and
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61 uses that same UART for the rest of the serial code download protocol. We read
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62 that same variable set by the boot ROM, which depends on the boot ROM version.
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63 To handle different Calypso boot ROM versions, we read the 16-bit word at 0x1FFE
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64 (the last 16 bits of the boot ROM image) where TI put the boot ROM version
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65 number, and we support boot ROM versions 0200 (Calypso C05 rev B silicon) and
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66 0300 (Calypso C035 silicon). Most target-utils programs won't work (will fail
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67 to select the UART for communication) if the boot ROM is some unsupported
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68 version or missing altogether, or if the boot ROM is there, but didn't do the
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69 loading.
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70
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71 The exceptions are as follows:
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72
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73 * c139explore always uses the MODEM UART as appropriate for Mot C139;
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74
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75 * flash-boot-test (a flashable program described later in this article) always
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76 uses the IrDA UART;
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77
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78 * helloapp is built in 3 versions: helloapp-bootrom.srec, helloapp-irda.srec
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79 and helloapp-modem.srec. The first version depends on the boot ROM like
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80 other programs, the other two versions are built as fixed-IrDA or fixed-MODEM.
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81
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82 Other boot ROM and fc-iram dependencies
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83 =======================================
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84
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85 There are two other ways in which target-utils programs that are meant to be
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86 loaded via fc-iram depend on the Calypso boot ROM:
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87
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88 1) The Calypso gets its clock input from the RF section of the GSM device, and
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89 the RF block can feed either 13 MHz or 26 MHz to the Calypso - some GSM RF
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90 transceiver chips require 13 MHz (TI Clara), others require 26 MHz (TI Rita
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91 and Silabs Aero II), yet others can work with either clock (Silabs Aero+),
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92 and some use a 26 MHz crystal but have the option of feeding either 13 or
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93 26 MHz to the Calypso (Aero II). The Calypso initially boots without knowing
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94 what clock frequency it is running at, but then it needs to be told via a
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95 register setting what the input clock frequency is, so that all peripherals
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96 (both GSM-specific and general-purpose) always run at 13 MHz.
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97
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98 When the Calypso boot process is interrupted and diverted to serial code
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99 download in the boot ROM, the boot ROM code autodetects whether the CLKTCXO
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100 input runs at 13 MHz or 26 MHz (it tries both register bit settings until
521
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101 the serial '<' characters sent by the host at 19200 baud are received
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102 correctly), and if the CLKTCXO input is 26 MHz, the VCLKOUT_DIV2 bit is set
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103 in the FFFF:FD02 register. Most of our target-utils programs have no hard-
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104 coded knowledge of the 13 MHz vs. 26 MHz board hardware configuration and
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105 rely on the Calypso boot ROM to set the division control bits in the
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106 FFFF:FD02 register correctly for the autodetected clock.
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107
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108 2) The boot ROM allows the serial download host (fc-iram in our case) to
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109 configure the Calypso DPLL, allowing the ARM7 core to run at its maximum
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110 frequency of 52 MHz on Calypso C035 or 39 MHz on the older Calypso C05
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111 silicon. None of our target-utils programs do their own DPLL setup, instead
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112 they run with whatever they were booted with - therefore, in order for the
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113 IRAM programs to run at their intended fastest speed, the correct -h option
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114 needs to be given to fc-iram, selecting a hardware parameter file with the
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115 right pll-config setting.
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116
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117 Delay loop timing
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118 =================
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119
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120 There are a few places in target-utils where a delay of some specific duration
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121 needs to be inserted. In most cases the requirement is for a certain minimum
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122 delay, with more delay time being harmless except for inefficiency, but there
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123 is one case (SPCA552E chip initialization in pirexplore) where the delay
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124 requirement is strict: if the delays are too short or too long, the LCD doesn't
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125 work. In target-utils all of these delays are implemented with CPU-cycle-count
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126 delay loops that are calibrated at software design time; if the code runs out
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127 of IRAM and the ARM7 core runs at 52 MHz, the delays will be exactly as
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128 designed, otherwise they will be longer. In the case of pirexplore the strict
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129 timing requirement is satisfied by loading and running the program via fc-iram
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130 -h pirelli, resulting in the correct 52 MHz clock configuration; in all other
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131 cases running at a frequency below 52 MHz or running out of flash (the
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132 flash-boot-test special case) produces longer-than-needed delays.
528
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133
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134 Common interactive commands
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135 ===========================
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136
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137 The exact set of implemented commands is different for each target-utils
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138 program, including commands specific to each program's unique function, but the
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139 following basic commands are included in most programs:
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140
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141 abbinit Initialize ABB communication
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142 abbpage2 Unlock access to ABB register page 2
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143 abbr pg reg Read ABB register <reg> on page <pg>
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144 abbw pg reg val Write <val> into register <reg> on page <pg>
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145 dump hex-start hex-len Display a human-oriented memory dump in hex and ASCII
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146 jump addr Jump to given address with BX
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147 poweroff Execute Iota ABB soft poweroff (DEVOFF)
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148 r8 addr Read an 8-bit register or memory location
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149 r16 addr Read a 16-bit register or memory location
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150 r32 addr Read a 32-bit register or memory location
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151 w8 addr data Write an 8-bit register or memory location
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152 w16 addr data Write a 16-bit register or memory location
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153 w32 addr data Write a 32-bit register or memory location
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154
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155 For further details, please refer to the source code - if you are playing with
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156 such low-level components, you need to put on the hat of a developer rather
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157 than a mere user.
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158
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159 ABB support in target-utils
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160 ===========================
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161
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162 Our target-utils suite includes code for initializing and executing SPI
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163 communication with the Iota ABB device (TWL3014 or TWL3025), Calypso's analog
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164 and power management companion chip. Only Iota ABB type is supported, not
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165 Omega/Nausica or Syren. The primary reason for having this infrastructure is
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166 to be able to perform a soft poweroff operation, i.e., to return the Calypso
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167 phone or modem to its switched-off state after flashing or various standalone
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168 debug operations, but once implemented, this same ABB SPI communication
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169 infrastructure is also used in model-specific hardware exploration utilities
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170 for functions like keypad backlight and vibrator control which are implemented
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171 via the ABB on some models, and it is used in simtest to control the part of
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172 the SIM interface that resides in the Iota ABB.
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173
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174 Aside from specialized programs like c139explore that are specific to target
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175 devices known to use the Iota ABB, most target-utils programs do not execute
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176 any ABB or SPI communication code (not even initialization) until they receive
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177 one of the ABB commands: abbinit, abbr, abbw or poweroff. This way if someone
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178 comes across a Calypso device that has a different ABB type or needs to debug a
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179 board with broken ABB communication, one can explore other functions without
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180 touching ABB commands.
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181
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182 The abb_init() function invoked by the abbinit command may be invoked multiple
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183 times: it maintains an internal flag remembering if the initialization steps
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184 have already been done or not, and repeated invokations do nothing. User-
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185 friendly abbr, abbw and poweroff commands invoke abb_init() internally, but the
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186 special abbpage2 command does not - if you are interested in exploring the
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187 undocumented register page 2, you need to execute abbinit manually first, then
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188 abbpage2, then explore with abbr and abbw.
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189
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190 poweroff operation details: VRPCAUX and VRPCDEV
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191 ===============================================
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192
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193 The abb_power_off() function invoked by the poweroff command performs the
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194 following sequence of steps:
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195
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196 * Calls abb_init() to establish ABB communication in the case that it hasn't
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197 already been done;
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198
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199 * Executes the magic writes to TAPCTRL and TAPREG registers that unlock access
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200 to register page 2 - this step is factored out into the abb_unlock_page2()
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201 function which is also accessible as the abbpage2 command;
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202
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203 * Writes 0x007 into the undocumented VRPCAUX register to clear the erratic
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204 state that will be there if we got booted via nTESTRESET rather than PWON;
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205
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206 * Flushes all UART output, i.e., waits for it to finish going out on the wire;
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207
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208 * Writes 0x001 into the VRPCDEV register, which is the actual DEVOFF command.
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209
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210 The step of writing into VRPCAUX and its prerequisite page 2 unlock steps are a
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211 recent addition as of fc-host-tools-r11; these steps have been added to fix the
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212 erratic behaviour that was occurring on TI/FC development boards (D-Sample and
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213 FCDEV3B) when fc-loadtool (or fc-iram with some specialized target-utils
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214 program) was entered via the RESET button rather than PWON, followed by the
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215 soft poweroff operation and another switch-on via PWON. For more details,
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216 please refer to the Calypso-test-reset article in the freecalypso-docs
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217 repository.
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218
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219 If you are interested in doing some experiments of your own with this
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220 undocumented quirk of the Calypso+Iota chipset and the odd behaviour it can
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221 cause, you can do the following:
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222
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223 * To see the content of the undocumented VRPCAUX register resulting from
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224 different boot modes, execute these commands:
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225
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226 abbinit
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227 abbpage2
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228 abbr 2 30
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229
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230 Our abbr and abbw commands support page 2, but if you don't issue the magic
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231 register writes encapsulated in the abbpage2 command, the Iota chip itself
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232 disallows access to page 2.
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233
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234 * To perform a DEVOFF operation without cleaning up VRPCAUX first (to see the
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235 resulting erratic behaviour with your own eyes), do it manually as follows:
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236
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237 abbw 0 30 1
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238
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239 flash-boot-test
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240 ===============
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241