FreeCalypso > hg > tcs211-l1-reconst
annotate README @ 261:fde2a5d01e33
g23m/copyblobs.sh: l1audio_back.obj deblobbed (LoCosto import was perfect match)
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 13 Mar 2017 03:42:04 +0000 |
parents | 53d8cb470dc7 |
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README written for tcs211-l1-reconst
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1 The purpose of this Hg tree (derived from leo2moko-debug) is to facilitate an |
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2 attempt at reconstructing an L1 source that would match the binary object |
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3 version we got with our TCS211 semi-src delivery from Sotovik. |
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5 The idea is to deblob TCS211 L1 one module or small group of modules at a time. |
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6 Take individual C modules from the LoCosto L1 source and get them to compile |
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7 in the TCS211 environment with TCS211 versions of all include files, producing |
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8 new from-source objects that would serve as candidate replacements for the ones |
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9 we got as blobs. An absolutely essential aspect of this approach is |
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10 incrementality: we should be able to deblob just a few L1 objects (replace them |
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11 with build-from-source versions) while keeping the original blobs for all other |
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12 parts of L1 we haven't reached yet, and regression-test at each step to ensure |
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13 that the firmware still works. |
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14 |
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15 TI's build system for this fw does not provide very fine granularity as far as |
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16 compiling each individual module from source or taking it as a delivered blob. |
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17 Instead it operates on the granularity of libs, or sometimes (as in the case of |
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18 L1) groups of libs. In the case of L1, this tree has the build system set up |
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19 to rebuild l1_ext.lib and l1_int.lib from source, which necessarily includes |
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20 _everything_ that goes into these libs. We are nowhere close to having a |
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21 working reconstructed source for every module in these two libs, thus we have |
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22 dummies in the place of most of them to appease BuSyB. Therefore, if you |
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23 simply run ./winebuild.sh to build this fw version, the link step will fail. |
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24 |
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25 Instead this fw has to be built in a somewhat convoluted way: |
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26 |
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27 1. Run ./winebuild.sh initially to compile everything leading up to the link |
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28 step, and let it fail. |
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29 |
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30 2. Go into g23m/__out__/gsm*/obj/l1_ext, and copy in original blob objects for |
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31 all those modules which have not been source-reconstructed yet. Do likewise |
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32 for l1_int. |
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33 |
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34 [Update: the copyblobs.sh script does this job now.] |
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35 |
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36 3. Run ./winebuild.sh again. As long as the dummy C files have not been |
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37 touched and the copied-in objects have newer timestamps, the dummies won't |
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38 be recompiled and the copied-in objects won't get blown away. TI's make |
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39 will rerun the ar packaging step to produce l1_ext.lib and l1_int.lib from |
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40 the mix of objects (some compiled from source, others copied-in blobs) in |
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41 the obj directories, and then the final link should succeed. |
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42 |
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43 The development process is as follows: |
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45 1. Choose an individual L1 C module to work on. |
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46 |
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README written for tcs211-l1-reconst
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47 2. Copy the source for the chosen module from the LoCosto source in the place |
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48 of the dummy in this tree. |
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50 3. Run ./winebuild.sh in the g23m directory and examine the output in |
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51 report.txt. If the imported C module fails to compile, massage it until it |
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52 passes compilation. |
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53 |
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54 4. Once compilation passes, look at the generated COFF object in |
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55 g23m/__out__/gsm*/obj/l1_{ext,int}. Disassemble it with the tiobjd tool |
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56 from freecalypso-reveng, and compare against the disassembly of the |
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57 original ("official") binary blob version we got. Massage the reconstructed |
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58 source until it compiles into object code that matches the original. |
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59 |
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60 [Update: use the scripts under g23m/objdiff to facilitate the disassembly |
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61 and diffing.] |