[Letux-kernel] 4.16 boot hickups

[H. Nikolaus Schaller]

Hi Andreas,

> Am 13.04.2018 um 19:56 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> On Fri, 13 Apr 2018 18:24:23 +0200
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
>> Hi,
>> 
>>> Am 13.04.2018 um 17:59 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>> 
>>> 
>>>> Am 13.04.2018 um 17:51 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>>> 
>>>> Hi,
>>>> 
>>>>> Am 13.04.2018 um 10:43 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>>>> 
>>>>> I wasn't able to mount NAND on this device manually either.
>>>>> 
>>>>> So I'll reformat it and then let's see if the problem is still there.
>>>> 
>>>> Well, the ubi0 error: scan_peb: bad image sequence number 1311990011 in PEB 1980, expected 1795890576
>>>> is gone, but the hickup is still there.
>>>> 
>>>> GTA04A5:	boots 10 of 10 attempts fine with boot after battery-insert
>>>> GTA04A4:	boots 2-3 attempts of 10 fine with boot after battery-insert
>>>> 		no problem after force-shutdown and power-on
>>> 		I should add that this is the same on two different GTA04A4
>>>> 
>>>> With letux-4.16-rc6 I have 10/10 on GTA04A4.
>>>> 
>>>> So either the OneNAND fix breaks the GTA04A4 or there is some other change
>>>> between letux-4.16-rc6 and letux-4.16 that is NOT active on GTA04A5. Maybe
>>>> some peripheral driver?
>>> 
>>> So please can someone try to confirm the problem on GTA04A4 with
>>> 
>>> http://download.goldelico.com/letux-kernel/letux-4.16/
>>> 
>>> vs.
>>> 
>>> http://download.goldelico.com/letux-kernel/letux-4.16-rc6/
>> 
>> I think I have found it. By revisiting what really differs
>> between both versions:
>> 
>> 1. some upstream patches
>> 2. OneNAND fix
>> 3. some Pyra DT changes
>> 4. pcal6524 and txs02612 fixes (Pyra)
>> 5. twl4030 sound+vibra (hfclk) fix
>> 6. ehci enable offmode
>> 
>> And I tried to remember when I first faced the problem. It was not with 3, 4 and 5.
>> So option 1, 2 and 6 remained.
>> 
>> It turned out that the last one ("omap: change enable off_mode default to 1")
>> makes the problems...
>> 
>> Reverting it makes the GTA04A4 boot well again.
>> Reverting the revert makes the hickup appear again.
>> 
>> Well, this patch is probably not the reason but it
>> enables a feature that some driver may not properly
>> handle.
>> 
> 
> But why it is related to GTA04A4 vs. GTA04A5? What are the relevant hw
> differences here? The processor is the same.

Yes.

> Different stuff on the i2c bus? Does clearly not matter.
> 26Mhz clock enable connected to pll? I am not sure. But that should only
> matter during suspend.
> 
> Anything else?

Well, it may be the NAND driver that is not happy with offmode...
Maybe the OneNAND is more happy.

And it might simply be a race / sequence issue based on different RAM
size or whatever.

I am just building with all MTD stuff disabled. Then we know more.

> Maybe lets just allow the USBHOST domain to go to off mode...
> Or find the problem why rmmod ehci-omap ; modprobe ehci-omap does not
> let the modem reappear when it is on the bus.

BR,
Nikolaus


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