[542458]

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]

I 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-locati...

[542458]

Good info. Thank you.

[pdoege]

No. We would use the baseband PMIC and DMA to move the info out of the AP if they were not integrated.

[d110af5ccf]

I 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.