FreeCalypso > hg > fc-tourmaline
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audio mode load: gracefully handle mode files of wrong AEC version
Unfortunately our change of enabling L1_NEW_AEC (which is necessary
in order to bring our Calypso ARM fw into match with the underlying
DSP reality) brings along a change in the audio mode file binary
format and file size - all those new tunable AEC parameters do need
to be stored somewhere, after all. But we already have existing
mode files in the old format, and setting AEC config to garbage when
loading old audio modes (which is what would happen without the
present change) is not an appealing proposition.
The solution implemented in the present change is as follows: the
audio mode loading code checks the file size, and if it differs
from the active version of T_AUDIO_MODE, the T_AUDIO_AEC_CFG structure
is cleared - set to the default (disabled AEC) for the compiled type
of AEC. We got lucky in that this varying T_AUDIO_AEC_CFG structure
sits at the end of T_AUDIO_MODE!
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 30 Jul 2021 02:55:48 +0000 |
| parents | a62e5bf88434 |
| children |
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State of blobs in FreeCalypso firmware ====================================== FC Tourmaline is almost completely deblobbed. Only the following very small components exist in the form of blobs (prebuilt binary objects for which we have no exact corresponding source) in the standard Tourmaline build: * OSL and OSX glue components of GPF: 14992 bytes of code * TMS470 compiler's RTS library (libc/libgcc equivalent): 13152 bytes of code For OSL and OSX we do have reconstructed C code written based on disassembly of the blobs, but I (Mother Mychaela) do not consider the current state of this C reconstruction to be fit for production use - hence standard Tourmaline fw builds use blob versions of these components. However, our configuration and build system gives you the freedom to select which version of each component you would rather use; the selection is made with Bourne shell config variables on the configure.sh invokation line: OSL=0 use the blob version of OSL OSL=1 use the reconstructed C version of OSL OSX=0 use the blob version of OSX OSX=1 use the reconstructed C version of OSX The current default is OSL=0 and OSX=0. RTS library =========== We do have source code for some versions of the TMS470 compiler's RTS library, but they may not be exactly corresponding to the blob version from TCS211 which we are using. This area is deemed to be such a low priority that no real investigation has been done yet.