[Librem-5-dev] Librem5 Devkit and `apt-get dist-uprade` notice

[Guido Günther]

Hi,
On Wed, Jun 05, 2019 at 09:25:31AM -0600, Heather Ellsworth via Librem-5-dev wrote:
> Hi Guido,
> 
> On 6/5/19 6:06 AM, Guido Günther via Librem-5-dev wrote:
> > Hi,
> > in order to prepare for using for 5.x kernels by default we adjusted the
> > device tree file names for the 4.18 kernel to match the linux-next
> > ones. So we now ship both imx8mq-librem5-devkit.dtb and librem5-evk.dtb
> > with identical content. On top of that we updated flash-kernel to look
> > for new imx8mq-librem5-devkit.dtb name as well.
> > 
> > You will not notice if you update by flashing new images, however if you
> > update via
> > 
> >   apt-get dist-upgrade
> > 
> > flash-kernel will get updated and your currently installed kernel package
> > might not yet have the imx8mq-librem5-devkit.dtb which makes
> > flash-kernel fail. In order to avoid that *either*:
> > 
> > 1.) flash a new image
> > 2.) grab a newer kernel from 
> > 
> >   https://arm01.puri.sm/job/Kernel_builds/job/kernel_devkit_linux-emcraft_imx8-4.18-wip/
> > 
> 
> This kernel is already in the latest 4.18 build:
> https://arm01.puri.sm/job/Images/job/Image%20Build/1642/

Yes. This only applies when *not* flashing a new image. If you flash a
new image there's no need to do anything.

> >   and install that before doing the dist-upgrade.
> > 3.) Copy your currently used device tree to
> >     /etc/flash-kernel/dtbs/imx8mq-librem5-devkit.dtb
> >     before doing the dist-upgrade.
> 
> /etc/flash-kernel/dtbs/ only contained README.dtbs so
> imx8mq-librem5-devkit.dtb was not found and I didn't copy my current DT.
> However, after going through all of these steps, a find command reveals
> that it is in 2 places:

The currently used device tree is at /boot/dtb so

   cp /boot/dtb /etc/flash-kernel/dtbs/imx8mq-librem5-devkit.dtb
   flash-kernel

would be the exact commend. And just to make this clear in case I phrased
it badly: you only need to do either 1.), 2.) or 3.).

> 
> /usr/lib/linux-image-4.18.11-g0c573537/freescale/imx8mq-librem5-devkit.dtb
> /boot/dtbs/4.18.11-g0c573537/imx8mq-librem5-devkit.dtb
> 
> The dist-upgrade went just fine and I rebooted. So this just primes my
> devkit for a future dist-upgrade to a 5.X kernel, is that right?

Glad it worked.
 -- Guido