FreeCalypso > hg > tcs211-l1-reconst
annotate README @ 320:8710d35a990f
l1p_driv.c: l1pddsp_transfer_mslot_power() imperfect reconstruction
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 04 Oct 2017 05:50:02 +0000 |
parents | 95f308ba55c7 |
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1 This Hg repository contains a version of TI's TCS211 firmware based on our sole |
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2 available TCS211 semi-src with the L1 component almost fully deblobbed. |
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3 Specifically, we have deblobbed all of L1 with the exception of GPRS-specific |
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4 l1p_*, macs and p_tpudr12 modules - all other L1 modules are recompiled from |
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5 reconstructed C sources, producing objects that work in the place of the |
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6 original blobs - sometimes matching bit for bit, in other cases differing in |
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7 the bits, but matching in logic. See STATUS for a detailed analysis of the |
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8 reconstruction matches and differences. |
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9 |
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10 Building the firmware in this tree requires a trick because of the not-yet- |
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11 deblobbed L1_GPRS modules - see README.old for the details. This tree only |
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12 supports the original gtamodem target; see FreeCalypso Magnetite for other |
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13 target support. |
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14 |
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15 Choice of version for reconstruction |
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16 ==================================== |
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17 |
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18 For some of the L1 objects (those packaged in l1_ext.lib and l1_int.lib) we |
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19 have two versions: the original from 20070608 (the same date as the rest of our |
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20 TCS211 semi-src) and an updated version of the l1_{ext,int}.lib set from |
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21 20080421. To the best of our knowledge, this 20080421 update was provided by |
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22 TI-Taiwan while engaged in a wild goose chase after the infamous bug #1024, |
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23 which later turned out to be a pure hardware problem, not involving the firmware |
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24 at all. |
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25 |
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26 The differences between the two versions are limited to just 3 objects: |
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27 l1_cmplx.obj and l1p_cmpl.obj in l1_ext.lib, and l1_ctl.obj in l1_int.lib. |
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29 When we were reconstructing l1_cmplx.c and l1_ctl.c from the available LoCosto |
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30 source, the reconstruction of the original 20070608 version came more easily |
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31 than the 20080421 update, and our reconstruction of these two modules matches |
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32 the 20070608 objects bit for bit. It thus appears that whatever changes TI's |
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33 customer support group made in that 20080421 version were not on TI's internal |
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34 mainline. |
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35 |
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36 Because the 20080421 L1 libs update was made for no other purpose except an |
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37 attempt to debug or fix what was erroneously believed to be a firmware problem |
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38 but turned out to be hw instead, we have every reason to believe that it does |
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39 not improve anything and is ultimately unnecessary. And because the original |
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40 20070608 version was easier to source-reconstruct than the other, we are |
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41 adopting the original 20070608 version and our reconstruction of its C source |
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42 form as the canonical version of TCS211 L1 for FreeCalypso. |
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43 |
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44 Note that because we have not source-reconstructed the GPRS-specific l1p_* |
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45 modules yet, we haven't looked at the l1p_cmpl.obj differences yet. However, |
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46 when building a complete fw image with GPRS included using our partially |
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47 reconstructed L1, one should use the 20070608 version of the l1p_cmpl.obj blob |
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48 for consistency, like we do in FreeCalypso Magnetite. |