Last night I wrote: > FreeCalypso gsm-fw environment: I got this reconstructed l1_dyn_dwl > code integrated into our gsm-fw, and I got it to build with > L1_DYN_DSP_DWNLD enabled. Behavior: the expected trace output > related to dynamic DSP download does NOT appear; attempting to dial > a MO voice call caused the DSP to go berzerk with errors.
I just fixed a couple of bugs that caused the bad breakage I saw yesterday, and now our gcc-built gsm-fw with L1_DYN_DSP_DWNLD enabled behaves like it did before adding this dynamic DSP download feature: voice calls connect without the DSP blowing up or keeling over, but the sound in the earpiece is still noise instead of the expected downlink audio. Like I expected, it appears that the magic for making AMR work correctly with our PD751992A Calypso silicon with DSP ROM 3606 is not in the dynamic DSP patch (the latter may be needed too for some corner cases, but seems to be less critical), but there is probably some magic present in the TCS211 binary blob versions of the L1 core modules that does some additional initialization or other manipulation of the DSP to resolve this quirk, magic that is not present in the version we got with the LoCosto source, probably because it isn't needed on LoCosto hardware and DSP ROM. Thus my work on the tcs211-l1-reconst subproject appears to be on the right track. The next step on that track will be to import the L1 core (as opposed to audio, GPRS, test modes etc) C modules from LoCosto into tcs211-l1-reconst and get them to compile in the TCS211 environment with unchanged TCS211 L1 headers, at least as far as structure definitions and function prototypes go. Then link the resulting pseudo-TCS211 with this xeno-transplanted L1 and try running it. I expect it to exhibit the same breakage at that point as our current gcc-built version does now. But once we do it in the TCS211 environment, we'll be able to switch between the original blobs and our reconstruction at the granularity of individual modules. We should then be able to bisect the problem down to the specific module where the culprit must be hiding, and then study the disassembly of that module and its differences against our reconstruction in more depth to find the necessary missing magic. Enthused as a girl on a mission, Mychaela _______________________________________________ Community mailing list Community@freecalypso.org https://www.freecalypso.org/mailman/listinfo/community
