Re: My first try installing

On Fri, 2024-06-07 at 22:06 -0700, [email protected]
wrote:
> > If I boot my Jetson Nano with no SD Card in it then I eventually
> > get
> > a U-Boot 2020.04 banner, a "Hit any key to stop autoboot:" prompt
> > and when the prompt times out it tries to boot from the
> > ethernet. This is good because we need U-Boot to boot NetBSD.
> 
> Does this mean the "extract uboot from pkgsrc" step is unnecessary?

I have no idea. Since the Wiki page is for a different board, it might
be entirely inappropriate. 

I described my board's behaviour because I can't remember if I have
modified the onboard firmware or not. You will need to compare my
board's behaviour with your board's behaviour. If you don't see U-Boot
like I see U-Boot then you will need to install U-Boot firmware
somehow. If I have modified the firmware on my board, it will have been
by following Nvidia's instructions to install newer Nvidia firmware.

> > I then copied the Nvidia Linux image to a µSD and mounted that card
> > on a Linux laptop. I copied the file
> > boot/kernel_tegra210-p3448-0000- p3449-0000-b00.dtb onto my
> > laptop. ...
> 
> I had not done this during my attempt because I assumed the needed
> dtb
> files were already in the u-boot image I extracted and dutifully
> dd'ed
> onto the beginning of the SD card. Was that a misconception?

U-Boot has its own copy of the devicetree for various reasons. AFAICT
U-Boot's "builtin" devicetree is usually loaded along with U-Boot by
the boot ROM. U-Boot then loads NetBSD's devicetree just before/after
it loads the NetBSD kernel. 

It turns out that the arm64 image I was using (downloaded from the
NetBSD CDN) already had a devicetree file in it for the Jetson Nano.
All of my testing was probably done with the NetBSD supplied devicetree
because it has a different filename from the Linux one. I have no idea
if the Linux and NetBSD devicetrees differ and it's something I'll look
into.