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annotate compal/boot/code-deriv @ 401:4b6b595ae0a0

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compal/boot/code-deriv: new analysis
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 14 Jan 2023 23:59:23 +0000
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children
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401
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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1 It is apparent that Compal's bootloader was genealogically derived from TI's
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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2 original FRBL (flash-resident bootloader) built into TCS211 reference fw. The
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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3 most "basic" or "pristine" version of Compal's bootloader is the one analyzed
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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4 in c123-boot.disasm, aided by symbolic information from R87.2.1.03.map; here we
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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5 shall analyze the diffs between this code and the original TCS211 version in
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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6 the ../../leo-obj/bootloader directory.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
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7
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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8 0x830: serial.obj .const section
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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9
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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10 Exact match to TCS211-20070608!
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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11
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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12 0x86c: bootloader.obj .text section
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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13
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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14 The only diffs from TCS211 are:
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Mychaela Falconia <falcon@freecalypso.org>
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15
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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16 1) The addition of these instructions (right at _INT_Bootloader_Start) to set
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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17 VCLKOUT_DIV2 bit in the FFFF:FD02 register:
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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18
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Mychaela Falconia <falcon@freecalypso.org>
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19 89c: e51f1020 ldr r1, =0xfffffd00 ; via 0x884
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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20 8a0: e1d120b2 ldrh r2, [r1, #2]
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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21 8a4: e51f002c ldr r0, =0x40 ; via 0x880
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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22 8a8: e1800002 orr r0, r0, r2
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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23 8ac: e1c100b2 strh r0, [r1, #2]
4b6b595ae0a0 compal/boot/code-deriv: new analysis
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24
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Mychaela Falconia <falcon@freecalypso.org>
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25 2) The addition of 32-bit word 0x40 to the literal at the beginning of this
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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26 .text section, before _INT_Bootloader_Start entry point.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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27
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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28 0x968: start.obj .text section
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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29
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Mychaela Falconia <falcon@freecalypso.org>
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30 Static function 0 (0x0 in reference object, 0x968 in Compal's bl) matches
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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31 exactly.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
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32
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Mychaela Falconia <falcon@freecalypso.org>
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33 Static function 1 (0x2c in reference object, 0x994 in Compal's bl) matches
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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34 exactly.
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35
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Mychaela Falconia <falcon@freecalypso.org>
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36 Static function 2 (0xe0 in reference object, 0xa48 in Compal's bl) matches
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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37 exactly.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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38
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Mychaela Falconia <falcon@freecalypso.org>
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39 Final function sta_select_application():
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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40
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Mychaela Falconia <falcon@freecalypso.org>
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41 * The beginning of the function is the same between TI and Compal versions:
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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42
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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43 - call to static function 0 (hw init)
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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44 - call to ser_initialize_serial_link()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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45 - call to con_initialize_conversion()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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46
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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47 * The remainder of the function differs fundamentally:
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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48
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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49 - TI's version calls cmd_check_application_in_flash(), followed by static
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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50 functions 1 and 2 that implement FRBL1 interrupt-boot window provision.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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51
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Mychaela Falconia <falcon@freecalypso.org>
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52 - Compal's version calls their heavily modified version of fluid_bootloader(),
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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53 which is where Compal's serial boot entry protocol is implemented, followed
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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54 by FTM_Tool_check() where the "ftmtool - (yes) - (modem)error" business
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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55 happens.
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56
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57 0xb10: boot.obj .text section
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58
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Mychaela Falconia <falcon@freecalypso.org>
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59 The dead code preamble before fluid_bootloader() function (5 32-bit ARM
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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60 instructions) is the same between TI and Compal versions.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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61
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62 The body of fluid_bootloader() is completely different, leaving only the now-
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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63 misleading function name: all FRBL2 code has been ripped out, replaced with
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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64 Compal's serial boot entry protocol.
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Mychaela Falconia <falcon@freecalypso.org>
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65
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Mychaela Falconia <falcon@freecalypso.org>
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66 The following functions from TI's original boot.c survive in Compal's version:
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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67
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Mychaela Falconia <falcon@freecalypso.org>
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68 jump()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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69 putchar()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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70 getchar()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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71 hardware_init() -- already a mostly-do-nothing in TCS211
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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72 uart_init()
4b6b595ae0a0 compal/boot/code-deriv: new analysis
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73
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Mychaela Falconia <falcon@freecalypso.org>
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74 The following functions in this module are entirely new in Compal's version:
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75
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76 SeekMsg()
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Mychaela Falconia <falcon@freecalypso.org>
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77 FTM_Tool_check()
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Mychaela Falconia <falcon@freecalypso.org>
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78 getchar_timeout()
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79 UartTimeout() -- unused!
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Mychaela Falconia <falcon@freecalypso.org>
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80 CheckFTMtoolMode()
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81 putchar__() -- unused!
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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82 getchar__() -- unused!
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83
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84 0xfb4: branch_in_RAM.obj .text section
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Mychaela Falconia <falcon@freecalypso.org>
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85
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Mychaela Falconia <falcon@freecalypso.org>
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86 Exact match to TCS211-20070608, but then it's a trivial assembly module.
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Mychaela Falconia <falcon@freecalypso.org>
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87
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88 0xfb8: command.obj .text section
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89
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90 Exact match to TCS211-20070608!
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Mychaela Falconia <falcon@freecalypso.org>
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91
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92 0x13d0: convert.obj .text section
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Mychaela Falconia <falcon@freecalypso.org>
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93
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Mychaela Falconia <falcon@freecalypso.org>
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94 Exact match to TCS211-20070608, including the call to fluid_bootloader() in
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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95 con_get_command_from_string() which is now a complete bogon.
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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96
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Mychaela Falconia <falcon@freecalypso.org>
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97 0x1594: optboot.obj .text section
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Mychaela Falconia <falcon@freecalypso.org>
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98
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Mychaela Falconia <falcon@freecalypso.org>
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99 Exact match to TCS211-20070608, except for one byte change in the ID returned
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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100 by opt_get_monitor_id().
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Mychaela Falconia <falcon@freecalypso.org>
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101
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102 0x165c: serial.obj .text section
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Mychaela Falconia <falcon@freecalypso.org>
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103
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Mychaela Falconia <falcon@freecalypso.org>
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104 Exact match to TCS211-20070608!
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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105
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106 0x1cec: cmdboot.obj .text section
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Mychaela Falconia <falcon@freecalypso.org>
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107
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Mychaela Falconia <falcon@freecalypso.org>
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108 Exact match to TCS211-20070608!
4b6b595ae0a0 compal/boot/code-deriv: new analysis
Mychaela Falconia <falcon@freecalypso.org>
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109
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110 0x1dd8: start.obj .text:v$3 section
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Mychaela Falconia <falcon@freecalypso.org>
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111
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Mychaela Falconia <falcon@freecalypso.org>
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112 Exact match to TCS211-20070608!