Re: Libre baseband
Hello Craig! you're proper cool ! Do you anything of your works public already? is it possibly this? https://github.com/craigcomstock/osmocom-bb/tree/mt62xx https://osmocom.org/projects/cellular-infrastructure/wiki/Accelerate3g5_--_escogido I thought about MTK chipsets as good start-point for development, because they are less locked-down and there is bigger chance, they did not protect ie. the DSP codes enough. Also the dev-board (mtk6260/fernvale) what do you use specifically? Last thing, what I'm curious about, if Librem 5 (the phone) is willing to allocate some funds into BB(P) development and open-sourcing, because they sure want to open the software/firmware/hardware at some point, but so far I think, they rely more on BBP vendor to allow this, not so much opening it up / developing them-selves. Cheers Marek On 12/17/2017 05:13 PM, cr...@unreasonablefarm.org wrote: > I am currently working on porting osmocom-bb to mtk6260/fernvale board > available via open hardware and from sysmocom. My goal is to get a nuttx-bb + > layer1 + mobile (osmocom-bb host software) working on fernvale and sim800h > modules. > > I am also working on integrating the old mt6235 sciphone g2 code as well as > look dforward to 3g/lte with mtk6735as in the ZTE Obsidian. > > I have some dreamy ideas about how to use fernly as a base for interactive > creation and validation of board support and translate that into osmocom-bb > firmware, nuttx application or library or even as a linux kernel driver or > user space program (maybe in the ec20 qualcomm module case). > > I'm not very far along but will try and share as many small PRs as possible . > I would encourage others to do the same. > > Cheers, > Craig > signature.asc Description: OpenPGP digital signature
Re: Libre baseband
Hi Harald! * using phones that don't use secure/authenticated boot for the BBP, or those where the certificates have leaked and/or exploits are known <>> Do we currently have any candidates? Or list of potential candidates? Are ie. Nexus devices friendlier ? * finding the time to work on the protocol stack beyond classic 2G which is currently implemented in OsmocomBB. <>> Wild idea this might be, but do we need BBP with 2G stack ? Could we settle for LTE-only open BBP ? I'm thinking about doing some chip works and minimizing the software stack based on srsUE Cheers :) Marek On 12/17/2017 01:33 PM, Harald Welte wrote: > Hi Marek! > > On Sun, Dec 17, 2017 at 12:58:00PM +0100, Marek Sebera wrote: >> Silly idea maybe, but would it be possible to port osmocom-bb for >> mediatek/intel/qualcomm BBP and replace the current firmware with open one? > > theoretically possible, yes. > >> I presume it will be a tremendous amount of work, no doubts, but apart from >> that, is it theoretically and technically possible? Given root and/or >> hardware acces of course, we do not need to preserve the old firmware or >> exploit the update process (ie. if specific cert signature is needed for >> bbp-soc firmware update) > > The biggest challenges, from my point of view, are: > > * using phones that don't use secure/authenticated boot for the BBP, or > those where the certificates have leaked and/or exploits are known > * finding significant enough amount of leaked sources or documentation > and/or doing the reverse engineering required to understand how to talk > to the DSP and/or related peripherals > * finding the time to work on the protocol stack beyond classic 2G which > is currently implemented in OsmocomBB. > > Regards, > Harald > signature.asc Description: OpenPGP digital signature
Re: Libre baseband
> * finding significant enough amount of leaked sources or documentation > and/or doing the reverse engineering required to understand how to talk > to the DSP and/or related peripherals I have looked through leaked sources for mtk6260 and think there may be enough info tgere, but I lack deep gsm knowledge so maybe I am deceived. > * finding the time to work on the protocol stack beyond classic 2G which > is currently implemented in OsmocomBB. This is the work I intend to purse. Slowly I'm afraid. Craig
Libre baseband
Hello everyone, Silly idea maybe, but would it be possible to port osmocom-bb for mediatek/intel/qualcomm BBP and replace the current firmware with open one? I presume it will be a tremendous amount of work, no doubts, but apart from that, is it theoretically and technically possible? Given root and/or hardware acces of course, we do not need to preserve the old firmware or exploit the update process (ie. if specific cert signature is needed for bbp-soc firmware update) Note that we do not have to be limited by existing software access to baseband, and we could use jtag/testpoints/wiring to access the BBP in a way that will be necessary, similar to way libreboot is currently being flashed. Thank you Marek Sebera
