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README update for the successful completion of the L1 reconstruction project
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 30 Oct 2017 18:03:24 +0000
parents 95f308ba55c7
children
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ed3e588600c1 README update for the successful completion of the L1 reconstruction project
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1 This Hg repository contains the result of the two year long project to deblob
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2 the L1 component in our copy of TCS211 from Sotovik by reconstructing the lost
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3 C source - see the Hg history for how this reconstruction has been accomplished.
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4 This reconstruction and deblobbing of TCS211 L1 is now complete: BuSyB XML
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5 config file g23m/system/busyb/deliverydefs/dlvcfg0.xml has been edited to
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6 rebuild all of L1 from source (L1_LIB_DLV, L1_CUST_LIB_DLV and L1_TPU_LIB_DLV
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7 all set to 0), pdt_2091.mak has been regenerated in this configuration, and all
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8 L1 libs are compiled from the reconstructed source under chipsetsw/layer1.
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9
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10 In most cases the reconstructed C source is perfect in that the resulting
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11 object is a bit-for-bit match to the original blob; in other cases the bits do
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12 not match exactly, but the logic has been verified to match nonetheless. See
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13 STATUS for a detailed analysis of the reconstruction matches and differences.
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15 This tree only supports the original gtamodem target; see FreeCalypso Magnetite
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16 for other target support.
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18 Choice of version for reconstruction
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19 ====================================
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21 For some of the L1 objects (those packaged in l1_ext.lib and l1_int.lib) we
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22 have two versions: the original from 20070608 (the same date as the rest of our
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23 TCS211 semi-src) and an updated version of the l1_{ext,int}.lib set from
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24 20080421. To the best of our knowledge, this 20080421 update was provided by
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25 TI-Taiwan while engaged in a wild goose chase after the infamous bug #1024,
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26 which later turned out to be a pure hardware problem, not involving the firmware
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27 at all.
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29 The differences between the two versions are limited to just 3 objects:
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30 l1_cmplx.obj and l1p_cmpl.obj in l1_ext.lib, and l1_ctl.obj in l1_int.lib.
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32 When we were reconstructing l1_cmplx.c, l1_ctl.c and l1p_cmpl.c from the
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33 available LoCosto source, the reconstruction of the original 20070608 version
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34 came more easily than the 20080421 update, and our reconstruction of these 3
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35 modules matches the 20070608 objects bit for bit. It thus appears that
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36 whatever changes TI's customer support group made in that 20080421 version were
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37 not on TI's internal mainline.
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39 Because the 20080421 L1 libs update was made for no other purpose except an
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40 attempt to debug or fix what was erroneously believed to be a firmware problem
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41 but turned out to be hw instead, we have every reason to believe that it does
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42 not improve anything and is ultimately unnecessary. And because the original
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43 20070608 version was easier to source-reconstruct than the other, we are
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44 adopting the original 20070608 version and our reconstruction of its C source
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45 form as the canonical version of TCS211 L1 for FreeCalypso.