# HG changeset patch # User Michael Spacefalcon # Date 1409812861 0 # Node ID 0427351817936953ca04f4cd0916be5ced9032cd # Parent 970d6199f2c527a84df2470215956cc47f9eeb58 gsm-fw/ccd/README: description of how we are going to tackle this component diff -r 970d6199f2c5 -r 042735181793 gsm-fw/ccd/README --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gsm-fw/ccd/README Thu Sep 04 06:41:01 2014 +0000 @@ -0,0 +1,31 @@ +CCD (Condat Coder and Decoder) is yet another component needed in order to +produce a functional GSM/GPRS MS (mobile station) firmware image based on the +TI/Condat architecture. We got the C source for this component from the +LoCosto find. + +CCD code that went into TI's firmware builds (as opposed to TI/Condat's +Windows-based tools etc) has two subdivisions: + +1. The main CCD library - ccd_na7_db.lib in the case of our Leonardo reference + firmware. The C modules compiled into this library must be very independent, + as it's one of the "frozen" GPF libs - it appears that GPF was maintained by + a separate group inside TI, and the builders of actual GSM/GPRS firmwares + used that group's GPF (and CCD) binary lib deliverables as untouched blobs. + +2. The ccddata component is meant to be compiled as part of the product firmware + build process, in both TCS211 and LoCosto versions. Our Leonardo reference + version has it in a binary lib too, but it's one of those "unprivileged + customer" libs, and one can see from the makefiles that it was meant to be + compiled the same way as L1 and L23 etc. The LoCosto version came with the + full source for all of CCD, but the build system is set up to only compile + ccddata, whereas the rest of CCD is used in the form of an imported GPF + binary lib, just like GPF proper, just like in TCS211. + +It appears, however, that the C source for both above-listed parts of CCD has +always been maintained in a single directory, and that is how it appears in the +LoCosto find. + +For our use in FreeCalypso we shall compile all of CCD (both subdivisions) into +a single library in this directory - in this project we always compile +everything from source anyway, so we may as well simplify the build process in +this regard.