Re: RPI: dtb files

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Fri, Oct 16, 2020 at 07:30:18AM -0700, Jason Thorpe wrote:
> 
> > On Oct 16, 2020, at 1:20 AM, Patrick Welche <prlw1%cam.ac.uk@localhost> wrote:
> > 
> > On Fri, Oct 16, 2020 at 06:40:55AM +0200, Martin Husemann wrote:
> >> On Thu, Oct 15, 2020 at 03:58:46PM -0400, Greg Troxel wrote:
> >>> I lean to "sync the armv7.img dtb contents with /boot".  I put that in
> >>> the HOWTO since if you do that and boot the system comes up.
> >> 
> >> Note that this all changed in -current; there you only unpack the new "dtb"
> >> set (with the EFI/FAT partition mounted as /boot).
> > 
> > Are overlay files meant to work? (in /boot/dtb/overlays)
> 
> I've used them on my ARMv6 RPI.  You have to specify the path to the .dtbo file in the RPI boot loader's config file, though.

From my attempt in

  http://mail-index.netbsd.org/port-arm/2020/10/10/msg006993.html

given

  os_prefix=dtb/
  dtoverlay=disable-bt

in config.txt, I expected

  dtb/overlays/disable-bt-overlay.dtbo

to be found, but apparently not(!) (Or at least, the console didn't appear
to change.)

> That particular device is off and in a shoebox at the moment,
> but I will try to dig it out this weekend and provide an example
> of how to use them.

Thanks!


Patrick