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Hmm. Re: chipset firmware, the GPS chip and the cellular modem are typically separate and not directly connected, right? So doesn’t that mean there is necessari
by 542458 5y ago
Hmm. Re: chipset firmware, the GPS chip and the cellular modem are typically separate and not directly connected, right? So doesn’t that mean there is necessarily something in the main phone software that’s handling passing GPS data from the gps to the modem chip on-demand from the modem firmware?
- kube-system 5y agoI believe it is pretty common for LTE modems to include GNSS support these days. I know many modems for even for data-only applications do. And it sounds like Qualcomm does it on their phone modems from this description: https://www.qualcomm.com/news/onq/2021/07/27/qualcomm-location-suite-ups-support-emergency-services https://www.qualcomm.com/news/onq/2021/07/27/qualcomm-locati...
- 542458 5y agoGood info. Thank you.
- pdoege 5y agoNo. We would use the baseband PMIC and DMA to move the info out of the AP if they were not integrated.
- d110af5ccf 5y agoI thought the kernel had the ability to restrict DMA on modern devices. But a sibling comment indicates that modems integrate GPS support these days so I guess it's irrelevant.