Le 09/05/2021 à 14:27, Christian Zigotzky a écrit :

On 08 May 2021 at 06:39pm, Christian Zigotzky wrote:

quoted

On 06 May 2021 at 03:58 pm, Christian Zigotzky wrote:

quoted

I have started bisecting again.

Link: https://forum.hyperion-entertainment.com/viewtopic.php?p=53106#p53106 
<https://forum.hyperion-entertainment.com/viewtopic.php?p=53106#p53106>

quoted

On 6. May 2021, at 10:09, Christophe Leroy [off-list ref] wrote:


- Can you check that 887f3ceb51cd with cherry-picked 525642624783 has Xorg working ?

git checkout 887f3ceb51cd
git cherry-pick 525642624783

Result: Xorg works.

quoted

quoted

- 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

git bisect start
git bisect good 887f3ceb51cd
git bisect bad 56bec2f9d4d0
git bisect good -- Xorg restarts again and again but we are looking for the first bad commit that 
stops the boot after loading the dtb and uImage.
git bisect good -- Xorg restarts again and again.
git bisect good -- Xorg restarts again and again.
git bisect good -- Xorg restarts again and again.

Result:

56bec2f9d4d05675cada96772a8a93010f4d82bf is the first bad commit
commit 56bec2f9d4d05675cada96772a8a93010f4d82bf
Author: Michael Ellerman [off-list ref]
Date:   Wed Mar 31 11:38:40 2021 +1100

    powerpc/mm/64s: Add _PAGE_KERNEL_ROX

    In the past we had a fallback definition for _PAGE_KERNEL_ROX, but we
    removed that in commit d82fd29c5a8c ("powerpc/mm: Distribute platform
    specific PAGE and PMD flags and definitions") and added definitions
    for each MMU family.

    However we missed adding a definition for 64s, which was not really a
    bug because it's currently not used.

    But we'd like to use PAGE_KERNEL_ROX in a future patch so add a
    definition now.

    Signed-off-by: Michael Ellerman [off-list ref]
    Link: https://lore.kernel.org/r/20210331003845.216246-1-mpe@ellerman.id.au (local)

:040000 040000 ff8171830c08e4f99852947a5c3b62e784220a26 85aff144e5219bce4eb6adb2ac32c6459cac22d0 
M    arch

---

git cherry-pick 525642624783

Output:

powerpc/signal32: Fix erroneous SIGSEGV on RT signal return
 Author: Christophe Leroy [off-list ref]
 Date: Fri Apr 23 13:52:10 2021 +0000
 1 file changed, 2 insertions(+), 2 deletions(-)

---

Xorg works after compiling with the cherry-pick of 525642624783.

Hi All,

I compiled and tested the latest git kernel with the new PowerPC updates 5.13-2 today. Unfortunately 
the Xorg issue still exists.
If I revert the PowerPC updates 5.13-1 and 5.13-2 then Xorg works without any problems.

Please check the BookE changes in the PowerPC updates 5.13-1 because my Book3S machines aren't 
affected by this issue.

On my side, book3e (corenet64_smp_defconfig) built with GCC 10.1 works well with QEMU 2.11.2

A kernel built with the configuration you provided doesn't boot on QEMU, no output at all, even with 
kernel v5.12.

What versions of GCC and QEMU are you using ?

Thanks
Christophe