Hi DS, Thanks for taking a look at this newer MTK stuff.
> note there's no information on wether a signature check is enforced > by the modem loader like what is done in modern SoC. I am not too worried about this aspect, as my interest is strictly in making our own hardware starting from bare chips like we've done with FCDEV3B, as opposed to hacking various complete devices made by one unworthy mainstream manuf or another. My understanding of the commonplace SoC restricted boot mechanisms is that typically there are OTP fuses on the die in which the device manuf programs a hash of their public key, and once these fuses have been programmed, the restricted bootloader will only accept signed code images verifiable with a public key that matches the fused hash. But it is my understanding that the signing keys are typically controlled by the manufacturers of complete devices, rather than the makers of bare chips, thus if *we* act in the role of the complete device manuf, buying bare chips on the Chinese grey market like we've done with the Calypso, then we can make our FreeMTK phone/modem products only accept firmware images signed by *us*, or leave the fuses unprogrammed, in which case the chip would presumably accept any code image. Instead what I see as the biggest problem would be finding a suitable chip to use. It appears that everyone else is only interested in those disgusting Android slab phones, and the only MTK chipsets people talk about are the ones with built-in bazillion-core application processors, the ones that are only suitable for building those darned Android slab phones and nothing else. Instead the kind of MTK chip I am looking for would be one that is just a modem, *without* the bazillion-core Android part, or alternatively a dumbphone-oriented chip in which the same single low-end ARM core performs both modem protocol stack and dumbphone UI functions, i.e., the same thing as TI Calypso & LoCosto and MT6260 (MTK's 2G-only dumbphone chip), but with 3G/UMTS capability in addition to GSM/2G. I have not been able to find any information on the latter kind of MTK chips so far, but they surely must exist. Has anyone else found anything in this direction? > From a quick glance those repositories contain the modem in precompiled > form, a set of .a files provided by mediatek along with a set of headers. This part is definitely a bummer. For as long as there are GSM/2G networks still operating, our FreeCalypso phones and modems are still leagues ahead of everyone else in terms of user freedom and empowerment, as we have the full source as opposed to blobs for the GSM+GPRS protocol stack and L1. But if T-Mobile USA shuts down their GSM/2G services in my neck of the woods (they are the last remaining GSM/2G network over here) and I lack the economic means to relocate to some third-world village where I could set up my own GSM cell without anyone noticing it, then we may have to look into building a 3G-capable device for which our "free" firmware would only be a thin shim around a big mass of binary blobs... :-( M~ _______________________________________________ Community mailing list Community@freecalypso.org https://www.freecalypso.org/mailman/listinfo/community