Re: imx6qdl based board won't boot with kernel 4.9.x


Marc Ferland
 

On Wed, Dec 11, 2019 at 9:10 AM Cory <cory@...> wrote:

Hi all,

I've been battling with upgrading the kernel our imx6qdl based custom board using Yocto Thud. We have been happily running the linux-imx 4.1-2 kernel, but it's time to push it forward to the 4.9.x versions. But it's not booting, at all. I've be poring over changes to other imxqdl based device trees and defconfigs, and nothing is making sense as to what change I may have missed (because I can't find many). We are running U-Boot 2017.11 (I know that could also be upgraded, but that shouldn't matter...unless I'm wrong).

I've stripped our kernel customizations down to nothing except for our board device tree, which works fine in kernel 4.1-X. We've never had issues like this with a kernel version bump before. After U-Boot loads the device tree and kernel, there is no output. When I check the HW, I've probed the DDR clock and it's stuck high. All 4.9+ kernels included in meta-freescale behave this same way:

## Booting kernel from Legacy Image at 10800000 ...

   Image Name:   Linux-4.9.123-imx+g6a71cbc

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    5476256 Bytes = 5.2 MiB

   Load Address: 10808000

   Entry Point:  10808000

   Verifying Checksum ... OK

## Flattened Device Tree blob at 11000000

   Booting using the fdt blob at 0x11000000

   Loading Kernel Image ... OK

   Using Device Tree in place at 11000000, end 1100dd66

Starting kernel ...

## NOTHING AFTER THIS ##

My main question is, has anyone else successfully used the linux-imx 4.9.x kernels (4.9.11, 4.9.123, etc), on a board based on the imx6qdl, and if so, do you have any tricks I'm missing? Has something major changed  in 4.9.x that affects the imx6 that I may have missed? (except for the framebuffer, that's another issue I'll deal with later).

Happens to me from time to time. Generally it is something with the kernel configuration (try deactivating stuff in the kernel until you get something that boots) or the device tree (again try commenting stuff out until you see a change, I've seen DTBs working with old kernel and breaking with recent ones).

Hope that helps,

Marc

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