[Letux-kernel] LetuxOS: kernel: letux-5.5-rc1

[H. Nikolaus Schaller]

> Am 11.12.2019 um 19:00 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> 
>> Am 11.12.2019 um 17:03 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>> 
>> 
>>> Am 10.12.2019 um 22:05 schrieb Andreas Kemnade <andreas at kemnade.info>:
>>> 
>>> On Tue, 10 Dec 2019 21:51:52 +0100
>>> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
>>> 
>>>>> Am 10.12.2019 um 20:57 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>>>> 
>>>>> 
>>>>>> Am 10.12.2019 um 19:01 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>>>>> 
>>>>>> Next, I'll try to build with your defconfig.  
>>>> 
>>>> I have simply copied it to arch/arm/configs/letux_defconfig. Then it will
>>>> be taken by my scripts.
>>>> 
>>>>> 
>>>>> Hm:
>>>>> 
>>>>> LD [M]  lib/crypto/libdes.o - due to: lib/crypto/des.o
>>>>> Building modules, stage 2.
>>>>> MODPOST 436 modules - due to target is PHONY
>>>>> ERROR: "input_unregister_polled_device" [drivers/iio/industrialio.ko] undefined!
>>>>> ERROR: "input_register_polled_device" [drivers/iio/industrialio.ko] undefined!
>>>>> ERROR: "devm_input_allocate_polled_device" [drivers/iio/industrialio.ko] undefined!
>>>>> make[3]: *** [__modpost] Error 1
>>>>> make[2]: *** [modules] Error 2
>>>>> make[1]: *** [__build_one_by_one] Error 2
>>>>> make: *** [sub-make] Error 2
>>>>> 
>>>>> $head->scratch()  
>>>> 
>>>> Ok, I have disabled the IIO_INPUT_BRIDGE.
>>>> 
>>>> Now I can compile
>>>> ...
>>>> ...
>>>> ...
>>>> and it boots. Also without display. There is no td028ttec1 panel driver in
>>>> modprobe -c. Indeed, CONFIG_DRM_PANEL_TPO_TD028TTEC1=m is not in your config.
>>>> CONFIG_DRM_OMAP_PANEL_TPO_TD028TTEC1=m is but that does no longer exist in
>>>> v5.5-rc1.
>>>> 
>>> well, no need for that on the letux 3704.
>> 
>> Indeed... I think the missing panel is a secondary bug.
>> 
>> I think I have boiled it down to
>> 
>> CONFIG_ARCH_BCM=y or n
>> 
>> (or one of the subconfigs enabled by that).
>> 
>> Will need a clean test though.
> 
> Well, unfortunately this is not sufficient alone.
> Seems to need more than one config to be disabled :(
> 
> Unfortunately I have no good strategy to bisect this.
> 
> Maybe I could take the good letux_defconfig that I have
> found, do a git reset and then by git add -p create
> small chunks of changes. And then a git bisect on this
> sequence?

Yes, that works. And seems to confirm the finding:

86b283cbdaf695009ee6d967e7314162839c696f is the first bad commit
commit 86b283cbdaf695009ee6d967e7314162839c696f
Author: H. Nikolaus Schaller <hns at goldelico.com>
Date:   Thu Dec 12 06:43:21 2019 +0100

    autosplit

 arch/arm/configs/letux_defconfig | 2 ++
 1 file changed, 2 insertions(+)
iMac:master hns$ git show 86b283cbdaf695009ee6d967e7314162839c696f
commit 86b283cbdaf695009ee6d967e7314162839c696f (refs/bisect/bad)
Author: H. Nikolaus Schaller <hns at goldelico.com>
Date:   Thu Dec 12 06:43:21 2019 +0100

    autosplit

diff --git a/arch/arm/configs/letux_defconfig b/arch/arm/configs/letux_defconfig
index 4d9c6c029e8b..e75831642f26 100644
--- a/arch/arm/configs/letux_defconfig
+++ b/arch/arm/configs/letux_defconfig
@@ -25,6 +25,8 @@ CONFIG_BLK_DEV_INITRD=y
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_SLAB=y
 CONFIG_PROFILING=y
+CONFIG_ARCH_BCM=y
+CONFIG_ARCH_BCM2835=y
 CONFIG_ARCH_MXC=y
 CONFIG_POWER_AVS_OMAP=y
 CONFIG_POWER_AVS_OMAP_CLASS3=y
iMac:master hns$ 

Well, I did start with a good config and this change makes it a bad one.
But the good one may have changed other configs.

I think I should reverse the good/bad tagging and start with original
letux-5.5-rc1 bad defconfig until it starts to work.

The basic principle is (well, I had to abort the loop manually):

GOOD=5aaa71815c46
BAD=letux-5.5-rc1
git checkout -B working-branch $GOOD
ARCH=arm make letux_defconfig savedefconfig
mv defconfig arch/arm/configs/letux_defconfig
git commit -m 'good' -a
git checkout $BAD -- arch/arm/configs/letux_defconfig
git reset HEAD
ARCH=arm make letux_defconfig savedefconfig
mv defconfig arch/arm/configs/letux_defconfig

while true
do
(echo s; echo s; echo s; echo s; echo s; echo y; echo q) | git add -p
git commit -m 'autosplit' | break
done

BR,
Nikolaus