I don't know u-boot, tinycore and pCP enough to say what is possible in terms of updates when the system runs.
The Pi has no traditional BIOS, the only thing it can do by itself is test the SD, the USB and the network for boot media. The media includes firmware and OS. Since TinyCoreLinux is so compact, I don't think you can find much gain in using some pivot OS on an SD. Now, 'according to the Pi 3 boot description' (https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/bootflow.md), if the OS on your SD (pCP) had a "suicide" option that would remove bootcode.bin, then on reboot the machine would look for media on the USB or network to boot from. And if such media was available and held a new version of the OS that had a "persist to SD" option, you could reboot and write the new OS to the SD. Unplug USB or ethernet, reboot again and you're done. Many devices have some "maintenance" USB port, with Pi 3 you theoretically could have either an USB or ethernet maintenance port. Purely theoretical. As I said I'm short of everything (even SDs) so testing is a bit cumbersome for me right now. 3 SB 3 Libratone Loop, Zipp Mini iPeng (iPhone + iPad) LMS 7.9 (linux) with plugins: CD Player, WaveInput, Triode's BBC iPlayer by bpa IRBlaster by Gwendesign (Felix) Server Power Control by Gordon Harris Smart Mix, Music Walk With Me, What Was That Tune? by Michael Herger PowerSave by Jason Holtzapple Song Info, Song Lyrics by Erland Isaksson AirPlay Bridge by philippe_44 WeatherTime by Martin Rehfeld Auto Dim Display, SaverSwitcher, ContextMenu by Peter Watkins. ------------------------------------------------------------------------ epoch1970's Profile: http://forums.slimdevices.com/member.php?userid=16711 View this thread: http://forums.slimdevices.com/showthread.php?t=107233
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