[Arm-dev] Community kernel 4.18.x

Mon Oct 22 13:11:42 UTC 2018

Just a note taht F30 (rawhide) is up to 4.19 and that adds some 
additional Allwinner support:

https://linux-sunxi.org/Mainlining_Effort

But it looks like I will want 4.20 for the R40 sata support  :(

On 10/22/18 8:26 AM, Mark Verlinde wrote:
> -----Oorspronkelijk bericht-----
>> Afzender:Pablo Sebastián Greco <pablo at fliagreco.com.ar>
>> Verstuurd: Zondag 21 Oktober 2018 23:58
>> Aan: Conversations around CentOS on ARM hardware <arm-dev at centos.org>
>> Onderwerp: Re: [Arm-dev] Community kernel 4.18.x
>>
>>
>> El 21/10/18 a las 17:06, Mark Verlinde escribió:
>>> -----Oorspronkelijk bericht-----
>>>> Afzender:Mark Verlinde <mark at havak.nl>
>>>> Verstuurd: Woensdag 17 Oktober 2018 18:49
>>>> Aan: Conversations around CentOS on ARM hardware <arm-dev at centos.org>
>>>> Onderwerp: Re: [Arm-dev] Community kernel 4.18.x
>>>>
>>>>
>>>> -----Oorspronkelijk bericht-----
>>>>> Afzender:Pablo Sebastián Greco <pablo at fliagreco.com.ar>
>>>>> Verstuurd: Woensdag 17 Oktober 2018 18:09
>>>>> Aan: Conversations around CentOS on ARM hardware <arm-dev at centos.org>
>>>>> Onderwerp: Re: [Arm-dev] Community kernel 4.18.x
>>>>>
>>>>>
>>>>>
>>>>> El 17/10/18 a las 11:47, Mark Verlinde escribió:
>>>>>> Hi,
>>>>>>
>>>>>> Kernel 4.18.x brings nice features, CPUFreq for Allwinner H3 SOC's being among them.
>>>>>>
>>>>>> Therefore I had a go on updating to the community-kernel-latest version 4.18.14-200.el7 which failed;
>>>>>> Dracut could not (re)build a intitramfs-4.18.14-.. and (probably because of this) uInitrd-4.18.14-.. was missing to.
>>>>>> Unfortunately did not write the exact error message down; next time will do so.
>>>>> Does /boot have enough space?, I usually try to have 3 kernels at most.
>>>>> I've been using that kernel in 3 different SoCs without problems,
>>>>> including Bananapi M3 (same SoC as the cubieboard5)
>>>> I do not doubt it had because it was the second kernel update done (i.e would be the 3rd installed)
>>>>
>>>> However : just successfully installed  with a more conservative approach 4.17.17 > 4.18.9 > 4.18.14
>>>> Side note is: this is on a home brew image without RPI bits and peaces, 786MB boot partition with ext4 file-system.
>>>> In time I will try again with default Centos-Generic image.
>>>>
>>>> i'm happy now:)
>>>> cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>>> ondemand
>>>>
>>>>>> BTW: Update to Kernel 4.17.17-200.el7 was successful on my oragngepi-plus2e
>>>>>>
>>>>>> In my own interest i'd really want to help to debug this;
>>>>>> but to be able to do this i need to understand in more detail how we boot Centos on our u-boot based SBC's.
>>>>>> I got the broad picture: u-boot >> extlinux bootloader >> kernel >>
>>>>> Correct
>>>>>> Getting lost however looking at extlinux/extlinux.conf , grub/grub.conf and not knowing the content of boot.scr
>>>>> You can ignore grub.conf and boot.scr, extlinux.conf is all you need
>>>> Sorry to persist, I'd really like to understand in more detail;
>>>> Questions circling in my head (among others)  are:
>>>> Why do we have a uInitrd _and_ initramfs ?
>>>> Why do we have a uimage _and_ vmlinux ?
>>>> Why does my odroid HC1 boot with a Fedora image but not with Centos (kernel 4.14.71 nor 4.17.17)? (despite specific USB3 patches are backported to 4.14)
>>>>
>>>>>> Can somebody enlighten me on this, or show me some further reading.
>>>>>>
>>>>>> (I did search fedora's arm documentation without getting smarter..)
>>>>>>
>>>>>> Actually in response to "Cubieboard5 performance"
>>>>>> (https://lists.centos.org/pipermail/arm-dev/2018-October/003515.html)
>>>>>>
>>>>>>
>>> Just a heads up, update to 4.18.16 works flawless on the above described setup on a oragngepi-plus2e.
>>> Did not find the time to test it with a default img as I'm still in a fight with the odroid HC1.
>>> For the latter the good new is: it's not an issue with the kernel but with the initramfs.
>>>
>> Thanks for testing!!
>> WRT the odroid, do you have an error log?
>> I've had my share of boot problems with supported devices, and they end
>> up being solved by something like what I said in this mail
>> https://lists.centos.org/pipermail/arm-dev/2018-August/003399.html
> Thank you for the hints, it Led to a booting setup!
>
> Still need to fine tine, some customization may not be needed howerever this configuration led to the booting odroid HC1.
>
> Appended cpuidle.off=1 console=tty1 console=ttySAC2,115200n8 to the cmdline:
>
> # cat /boot/extlinux/extlinux.conf
> # extlinux.conf generated by appliance-creator
> ui menu.c32
> menu autoboot Welcome to Centos-Uboot-Community-kernel. Automatic boot in # second{,s}. Press a key for options.
> menu title Centos-Uboot-Community-kernel Boot Options.
> menu hidden
> timeout 20
> totaltimeout 600
>
> default=Centos-Uboot-Community-kernel (4.18.14-200.el7.armv7hl)
> label CentOS Linux (4.18.16-200.el7.armv7hl) 7 (AltArch)
>          kernel /vmlinuz-4.18.16-200.el7.armv7hl
>          append cpuidle.off=1 console=tty1 console=ttySAC2,115200n8 ro root=UUID=a306d630-4957-4da0-8dd6-79f943147d61 LANG=en_US.UTF-8
>          fdtdir /dtb-4.18.16-200.el7.armv7hl
>          initrd /initramfs-4.18.16-200.el7.armv7hl.img
>
> label Centos-Uboot-Community-kernel (4.18.14-200.el7.armv7hl)
>          kernel /vmlinuz-4.18.14-200.el7.armv7hl
>          append cpuidle.off=1 console=tty1 console=ttySAC2,115200n8 ro root=UUID=a306d630-4957-4da0-8dd6-79f943147d61
>          fdtdir /dtb-4.18.14-200.el7.armv7hl
>          initrd /initramfs-4.18.14-200.el7.armv7hl.img
>
> In an effort to mimic the FC28 intenramfs added/omitted  some modules and
> added _all_ exynos and samsung divers loaded by the booting FC28 setup:
>
> #cat /etc/dracut.conf.d/odroid_hc1.conf
> add_dracutmodules+="dm"
> omit_dracutmodules+="network ifcfg"
> add_drivers+="exynosdrm exynos_bus exynos_trng exynos_nocp exynos_rng phy_exynos_dp_video phy_exynos_mipi_video dwc3_exynos clk_exynos_audss i2c_exynos5 dw_mmc_exynos dw_mmc_pltfm dw_mmc phy_exynos_usb2 phy_exynos5_usbdrd pwm_samsung "
>
> (AGAIN) NOTE: some may be necessary others may be ommited..
>
>>
>> Pablo.
>>
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