Hi,

Le 06/05/2021 à 09:56, Christian Zigotzky a écrit :

Hi Christophe,

Ok, so let's summarise from my side.

The issue is in the PowerPC updates 5.13-1. I reverted these and after that the issue is gone.
We know that only BookE machines are affected. Book3S machines are working with the PowerPC updates.
I think it’s not directly an Xorg issue. It’s more a symptom that Xorg restarts again and again. In my point of view the changes for BookE machines in the PowerPC updates are responsible for this issue.
Bisecting costs a lot of time and I don’t have time for my main work anymore.
Bisecting is good but sometime you have to check your code yourself. We know all facts and now it’s time to check the code because of BookE compatibility.

@All
You can test it with QEMU as well. I provide some virtual machines and kernels for testing. Guys, it is really important that you test your changes before you release them.

So, summary from my side:

You popped up telling that commit 887f3ceb51cd was the reason of your problem. As I am the one who 
released that commit, I took a look, and identified that 525642624783 should have fixed it.

You are working with a 64 bits kernel. My domain is 32 bits kernels.

I have no problem at all with corenet64_smp_defconfig booting QEMU with any of the commits you pointed.

On my side QEMU doesn't work at all with the configuration you provided, I don't get any output at 
all on the screen.


So how can we progress ?

I know bisecting is not always easy, and for sure you must have spend a lot of time with all those 
skipped steps. But it provided us good information anyway and I'm sure we could progress quickly if 
you can do the few tests I suggested in my last email:

- Can you check that 887f3ceb51cd with cherry-picked 525642624783 has Xorg working ?
- Can you bisect between 887f3ceb51cd[good] and 56bec2f9d4d0[bad] to identify first bad commit that 
stops after loading the dtb and uImage ?
- Once that first bad commit is identified, can you check whether the preceeding commit with 
cherry-picked 525642624783 has Xorg working or not ?

Thanks
Christophe