Made a little research. Looks like Nexus7 does have jtag and uart. May be Nexus9 is the same. https://github.com/tofurky/tegra30_debrick/blob/master/image/n7_uart_schematic.jpg
Also, here the dude actually wrote an OS for Nexus9. On assembler of couse. 64-bit ARM OS/Kernel/Systems Development Demo on a Nexus 9 https://github.com/andreiw/nexus9_demo Also, I'm just looking at htc's HBOOT, and it suspiciusly looks like u-boot. And the guy is using a UART headphone jack adapter to a computer. And he's able to boot his custom code successfully. Another bread crum. And it has an actual vendor's documentation! https://developer.nvidia.com/embedded/tegra-k1-reference And the u-boot has an example for another tegra phone. It might have some similarities with Nexus 9 https://github.com/u-boot/u-boot/blob/master/doc/board/htc/endeavoru.rst I just don't have such device myself. So I'll stop researching that. But I promise to test out pil21-u-boot-or-whatever on OrangePiZero which I have. I might also have RPI but I have to find it. On Fri, May 16, 2025, 11:13 mayor84 <mayo...@gmail.com> wrote: > Pure guessing here. External ram and MMU are board specific. Probably eMMC > needs special care in configs. And serial port which suppose to be > integrated in soc. It's probably the bare minimum for any OS. > > Another question how to upload that new firmware to your dev. It could be > bootlocked, etc. I didn't have much exp and success with phones. Sbc like > OrangePi and Raspberry Pi are much more straight forward. > > Also, I don't know if nexus phones have special connectors to communicate > with serial port or jtag. > > On Fri, May 16, 2025, 10:20 Alexander Burger <picolisp@software-lab.de> > wrote: > >> On Thu, May 15, 2025 at 09:25:59PM +0500, mayor84 wrote: >> > I might be wrong, but is it u-boot already configured for nvidia tegra >> k1 >> > soc? >> > >> > System chip NVIDIA Tegra K1 (28 nm) >> > Processor Dual-core, 2300 MHz, Denver >> > GPU Kepler >> > RAM 2GB (DDR3) >> > Internal storage 32GB >> > >> > https://www.phonearena.com/phones/Google-Nexus-9_id8926 >> >> Yes, that's the right one. >> >> >> > https://github.com/OE4T/u-boot-tegra >> >> Hmm, OK, this may cover the CPU, but what support for the rest of the >> hardware is needed to boot PilOS? >> >> ☺/ A!ex >> >> >> -- >> UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe >> >
