FreeCalypso > hg > tcs211-l1-reconst

annotate README @ 298:38ece3f48a66

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l1p_cmpl.c: l1ps_ctrl_single() reconstructed
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Oct 2017 06:38:38 +0000
parents 95f308ba55c7
children ed3e588600c1
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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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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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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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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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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.