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L1: resurrect TCH tap feature In this new incarnation of our TCH tap feature, we support DL sniffing in all 3 of FR1, HR1 and EFR, and the new implementation will capture every 20 ms frame where the old one silently skipped a frame (sent nothing) during FACCH stealing. The wire interface on RVTMUX changed slightly, and fc-shell tch record will need to be updated to support the new version. TCH UL play or substitution is supported for FR1 and EFR only; support for HR1 can be added later if needed.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Dec 2022 02:44:01 +0000
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1 State of blobs in FreeCalypso firmware
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2 ======================================
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3
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4 FC Tourmaline is almost completely deblobbed. Only the following very small
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5 components exist in the form of blobs (prebuilt binary objects for which we
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6 have no exact corresponding source) in the standard Tourmaline build:
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7
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8 * OSL and OSX glue components of GPF: 14992 bytes of code
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9 * TMS470 compiler's RTS library (libc/libgcc equivalent): 13152 bytes of code
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10
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11 For OSL and OSX we do have reconstructed C code written based on disassembly of
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12 the blobs, but I (Mother Mychaela) do not consider the current state of this C
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13 reconstruction to be fit for production use - hence standard Tourmaline fw
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14 builds use blob versions of these components. However, our configuration and
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15 build system gives you the freedom to select which version of each component
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16 you would rather use; the selection is made with Bourne shell config variables
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17 on the configure.sh invokation line:
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18
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19 OSL=0 use the blob version of OSL
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20 OSL=1 use the reconstructed C version of OSL
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21 OSX=0 use the blob version of OSX
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22 OSX=1 use the reconstructed C version of OSX
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23
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24 The current default is OSL=0 and OSX=0.
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25
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26 RTS library
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27 ===========
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28
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29 We do have source code for some versions of the TMS470 compiler's RTS library,
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30 but they may not be exactly corresponding to the blob version from TCS211 which
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31 we are using. This area is deemed to be such a low priority that no real
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32 investigation has been done yet.