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author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 23 May 2020 03:39:48 +0000
parents b6b8307d195b
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b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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1 In FreeCalypso we use 3 different file formats for Calypso binary images, i.e.,
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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2 code images to be loaded into either flash or RAM or retrieved flash dumps.
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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3 These 3 different file formats are straight binary (*.bin), moko-style m0 (*.m0)
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Mychaela Falconia <falcon@freecalypso.org>
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4 and little-endian S-records (*.srec).
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Mychaela Falconia <falcon@freecalypso.org>
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5
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6 Straight binary (*.bin)
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7 =======================
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8
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9 Straight binary is our preferred format for flash dumps. It is written in the
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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10 native little-endian byte order of the Calypso ARM7 processor, i.e., the order
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Mychaela Falconia <falcon@freecalypso.org>
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11 of bytes in the raw binary file directly corresponds to incrementing byte
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Mychaela Falconia <falcon@freecalypso.org>
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12 addresses as visible to the ARM7 - any ASCII strings in the image thus appear
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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13 naturally. We also use the same straight binary format in native LE byte order
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
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14 for flashable code images generated with the gcc+binutils toolchain (as opposed
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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15 to TI's TMS470), generated with arm-elf-objcopy -O binary - although we don't
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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16 have too many such code images currently given that neither FC Citrine nor FC
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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17 Selenite ever achieved production quality.
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18
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
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19 Another unrelated use of this straight binary format is for RAM-loadable code
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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20 images that are fed to Compal's bootloader (Motorola C1xx and Sony Ericsson
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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21 J100) as opposed to Calypso boot ROM. Our generally preferred image format for
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Mychaela Falconia <falcon@freecalypso.org>
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22 RAM-loadable code pieces is little-endian S-records (*.srec, see below), but
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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23 for Compal's bootloader we use straight binary instead because of the way this
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
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24 bootloader protocol works.
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25
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26 moko-style m0
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27 =============
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28
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Mychaela Falconia <falcon@freecalypso.org>
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29 This format is a variant of Motorola hex (S-records), a variant invented by TI
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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30 rather than by us. This format is produced by TI's hex470 tool when run with
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Mychaela Falconia <falcon@freecalypso.org>
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31 -m -memwidth 16 -romwidth 16 options, which is the configuration used by TI in
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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32 the Calypso program, and is read by TI's flash programming tool called FLUID.
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Mychaela Falconia <falcon@freecalypso.org>
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33 TI used this format not only for flashable firmware images, but also for various
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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34 RAM-loadable code pieces, particularly those that comprise the target-side
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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35 component of FLUID.
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36
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37 The special quirk of this S-record variant format is its peculiar byte order.
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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38 TI viewed it as "16-bit hex", meaning that the image is logically viewed as
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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39 consisting of 16-bit words rather than 8-bit bytes, each S3 record carries an
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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40 even number of bytes to be loaded at an even address, and each 16-bit word
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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41 (4 hex digits) appears in these S3 records with its most-significant hex nibble
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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42 toward the left, just like the address field of each S-record. But if this
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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43 image gets interpreted by some more naive tool (for example, objcopy from GNU
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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44 binutils) as bytes rather than 16-bit words, the result will be a reversed byte
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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45 order, with all strings etc messed up.
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46
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47 In FreeCalypso we use this moko-style m0 format (our new name for what TI called
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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48 16-bit hex) only for flashable firmware images built with TI's TMS470 toolchain
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49 (can be our own FC Magnetite or historical ones built by Openmoko or other
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Mychaela Falconia <falcon@freecalypso.org>
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50 similar historical vendors), but never for any RAM-loadable code pieces - we use
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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51 little-endian SREC for the latter as explained below.
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52
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53 And what about the name? Why do we call it moko-style m0 rather than just m0?
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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54 The reason is because Compal muddied our waters by introducing their own *.m0
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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55 files that were generated with -memwidth 8 -romwidth 8 instead of -memwidth 16
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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56 -romwidth 16, producing 8-bit hex instead of 16-bit hex. We do not support
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Mychaela Falconia <falcon@freecalypso.org>
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57 Compal's different *.m0 files at all, and we needed some name to specifically
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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58 identify TI-style m0 files rather than Compal-style. We ended up with the name
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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59 moko-style rather than TI-style because we already had our mokosrec2bin program
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60 going back to 2013-04-15, one of the very first programs written in the
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Mychaela Falconia <falcon@freecalypso.org>
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61 FreeCalypso family of projects: our very first encounter with this file format
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
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62 were mokoN firmware images put out in this *.m0 format by That Company.
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63
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64 Little-endian S-records (*.srec)
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65 ================================
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66
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Mychaela Falconia <falcon@freecalypso.org>
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67 Back at the beginning of FreeCalypso in the spring/summer of 2013 I (Mother
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68 Mychaela) decided to use S-records instead of straight binary for our
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
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69 RAM-loadable code pieces, i.e., code that is loaded into RAM either through the
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Mychaela Falconia <falcon@freecalypso.org>
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70 Calypso boot ROM (fc-iram) or by chain-loading via loadagent (fc-xram). I made
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71 this decision based on two factors:
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72
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73 1) ARM code generated by common toolchains (both TI's TMS470 and gcc+binutils)
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74 without special contortions is not position-independent: a code image that
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75 was linked for a given address needs to be loaded at that specific address,
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76 not some other.
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77
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78 2) An S-record image has its load address embedded in the image itself, whereas
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
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79 a raw binary naturally does not carry any such extra metadata.
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80
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81 With SREC as the standardized hand-off format from code generation tools to
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Mychaela Falconia <falcon@freecalypso.org>
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82 loadtools, the choice of load address is made entirely on the code generation
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Mychaela Falconia <falcon@freecalypso.org>
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83 side; loadtools do not impose a fixed load address, nor do they require it to
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Mychaela Falconia <falcon@freecalypso.org>
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84 be communicated via extra command line arguments or options.
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85
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86 However, the variant of SREC we use for RAM-loadable code pieces is not the same
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87 as moko-style m0 - the byte order is the opposite, with our RAM-loadable code
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88 pieces using the native little-endian byte order of the ARM7 processor as the
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Mychaela Falconia <falcon@freecalypso.org>
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89 byte order within S3 records. Prior to the introduction of RAM-loadable FC
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Mychaela Falconia <falcon@freecalypso.org>
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90 Magnetite fw images for Pirelli DP-L10 in late 2016 (and then likewise for our
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91 own FCDEV3B), the only RAM-loadable code pieces we have had were built with
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Mychaela Falconia <falcon@freecalypso.org>
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92 gcc+binutils, not with TMS470, and GNU binutils got a different take on the
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Mychaela Falconia <falcon@freecalypso.org>
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93 S-record format than TI did: they generate byte-oriented SREC files, with the
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94 byte order being the same as it would be in a straight binary file, matching
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Mychaela Falconia <falcon@freecalypso.org>
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95 the target processor's memory byte addressing order. Thus GNU-style SREC has
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96 been adopted as the format for our RAM-loadable code images for both fc-iram
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97 and fc-xram, as opposed to TI-style SREC aka moko-style m0. The convention we
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98 have adopted is that *.m0 filename suffix means TI-style aka moko-style,
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99 whereas *.srec means GNU-style.
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100
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101 Besides the S3 record byte order, there is one other difference between TI-built
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Mychaela Falconia <falcon@freecalypso.org>
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102 *.m0 code images and GNU-built *.srec ones: the final S7 record carries the
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Mychaela Falconia <falcon@freecalypso.org>
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103 entry point address in GNU-built *.srec images, whereas TI's *.m0 images always
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104 have a zero dummy address in there. Our fc-iram and fc-xram tools require the
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105 real entry point address in the S7 record.
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106
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107 How do we generate ramimage.srec RAM-loadable images for fc-xram in FC
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108 Magnetite? Answer: FC Magnetite build system includes a special ad hoc
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Mychaela Falconia <falcon@freecalypso.org>
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109 converter program that reads ramimage.m0 produced by TI's hex470 tool and
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110 produces ramimage.srec: it reverses the order of bytes, adds another S3 record
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111 that writes the boot-ROM-redirected interrupt and exception vectors and
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112 generates an S7 record with the right entry point address.
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113
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114 This little-endian *.srec format is actively used only for RAM-loadable code
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115 pieces in FreeCalypso, not for anything that goes into or gets read from flash.
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116 We do have flash dump2srec and flash program-srec commands in fc-loadtool, they
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
parents:
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117 were implemented back in the founding stage of FreeCalypso in 2013 for the sake
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
parents:
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118 of completeness and symmetry (it seemed right to support both binary and
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
parents:
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119 S-record formats), but they never got any practical use: if you are making a
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 flash dump, you would normally want to examine it afterward, and any such
b6b8307d195b doc: new articles Binary-file-formats and Flash-programming
Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 examination almost always needs a straight binary image, not S-records.