Re: Unstable Kernel behavior on an ARM based board

[Thierry Reding <thierry.reding@gmail.com>]

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On Sat, Mar 02, 2019 at 11:46:52AM +0000, Russell King - ARM Linux admin wrote:
> On Sat, Mar 02, 2019 at 12:25:54PM +0100, Willy Tarreau wrote:
> > On Sat, Mar 02, 2019 at 04:22:48PM +0500, Embedded Engineer wrote:
> > > Thanks for response Russel and Willy, but AFIK the only available
> > > Nvidia downstream kernel for our processor is 3.10.40. I tried
> > > building the upstream kernel (4.9.x I guess) but it kept crashing even
> > > worse so I didn't invest any more time bringing it up on our board.
> > 
> > Then if you depend on a vendor kernel, you have to deal with that vendor
> > since they are the only ones who know what they secretly modified in the
> > kernel to make it magically work sometimes.
> 
> I don't see why that would be necessary - mainline has support for the
> Nvidia Jetson TK1 board, which means we have support for the SoC, so
> mainline kernels should boot fine.

We've got automated testing in place for most of the boards we support
upstream. Most stable kernels are tested, as is linux-next. Jetson TK1
is among the board tested and I'm not aware of any recent regressions,
other than maybe the occasional one in linux-next that usually end up
impacting more than just Tegra.

Adding Jon who keeps better track of the test results than I do.

I should note that there are valid reasons for people wanting to stick
with the downstream kernel. The simple truth is that we lack a certain
number of features upstream, so if customers rely on those they don't
have a lot of choice. We're actively trying to close the feature gap,
but we're not quite there yet.

That said, I agree with what Russell and Willy said. Using a 3.10 kernel
as a base for product development is a bad idea.

My suggestion is to use a recent linux-next as a baseline for testing.
That's the best bet for validating that your hardware is good. Once you
have established that we should have a brief chat about what exactly the
requirements are that you have and then we'll have to evaluate how best
to support you.

Thierry

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