Linked by Thom Holwerda on Tue 12th Nov 2013 23:06 UTC
PDAs, Cellphones, Wireless

I've always known this, and I'm sure most of you do too, but we never really talk about it. Every smartphone or other device with mobile communications capability (e.g. 3G or LTE) actually runs not one, but two operating systems. Aside from the operating system that we as end-users see (Android, iOS, PalmOS), it also runs a small operating system that manages everything related to radio. Since this functionality is highly timing-dependent, a real-time operating system is required.

This operating system is stored in firmware, and runs on the baseband processor. As far as I know, this baseband RTOS is always entirely proprietary. For instance, the RTOS inside Qualcomm baseband processors (in this specific case, the MSM6280) is called AMSS, built upon their own proprietary REX kernel, and is made up of 69 concurrent tasks, handling everything from USB to GPS. It runs on an ARMv5 processor.

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RE[2]: Great article
by theosib on Wed 13th Nov 2013 19:15 UTC in reply to "RE: Great article"
theosib
Member since:
2006-03-02

What’s ironic is that RMS really does have nothing to hide. He wants everything Free and out in the open, with the exception of personal things that SHOULD be private. He wants his personal privacy not because he’s doing anything illegal (well, maybe he smokes a little pot, but only fascists care about that), but because he believes in the inalienable right of personal privacy.

Basically, as the leader of the “Free” world, RMS is the ideal counter-argument to “if you have nothing to hide."

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