RE: [meta-freescale] Linux v5.10 for i.MX8 development

Hello Andrey,

> -----Original Message-----
> From: Andrey Zhizhikin <[email protected]>
> Sent: Thursday, 30 September 2021 9:44 PM
> To: Ankur Tyagi <[email protected]>
> Cc: [email protected]
> Subject: Re: [meta-freescale] Linux v5.10 for i.MX8 development
> 
> Hello Ankur,
> 
> On Tue, Sep 21, 2021 at 11:43 AM Ankur Tyagi <[email protected]> wrote:
> >
> > Hello Andrey,
> >
> > > Hello Ankur,
> > >
> > > On Mon, Sep 20, 2021 at 11:30 PM Ankur Tyagi <[email protected]> wrote:
> > > >
> > > > Hi,
> > > >
> > > > We are currently using Linux v5.4 for i.MX8 provided by recipe linux-fslc-imx_5.4.bb because as mentioned in recipe as well,
> branch "5.4-2.3.x-imx" from repo "linux-fslc" get changes merged from branch "imx_5.4.70_2.3.0" of linux-imx repo
> (https://source.codeaurora.org/external/imx/linux-imx/log/?h=imx_5.4.70_2.3.0)
> 
> If you're still interested in migrating to the new linux-fslc-imx
> kernel, it has been integrated into meta-freescale with this PR:
> https://github.com/Freescale/meta-freescale/pull/876
> 
> Current recipe now picks up [lf-5.10.52-2.1.0] branch from NXP kernel
> repo and has latest stable patch applied.

Thank you so much for your message, indeed interested :-)

> > > >
> > > > Now we are planning to upgrade to Linux v5.10 and here I have few questions:
> > > >
> > > > 1. Recipe linux-fslc-lts_5.10.bb doesn't support i.MX8 https://github.com/Freescale/meta-
> freescale/blob/325ad529187fb1309b0a889c5196c8df039aeea9/recipes-ke... Neither I can see any merge from NXP linux-imx branch
> "lf-5.10.y" into linux-fslc branch "5.10.x+fslc".
> > >
> > > When you say that i.MX8 is not supported - to which SoC you're
> > > referring to? Mainline kernel on the [master] branch of this layer
> > > does provide a descent support for all i.MX8M derivatives, but I'm not
> > > entirely sure of the state for i.MX8 family SoC support since I do not
> > > have that HW.
> >
> > I was referring to COMPATIBLE_MACHINE in linux-fslc-lts_5.10.bb recipe.
> > It doesn't have mx8 in it (sorry above link is broken)
> >
> > > Can you specify which derivative you're talking about?
> >
> > We are using i.MX8 Dual core A35
> >
> > > > Is there any plan for that merge? If yes, any timeline by which it will happen?
> > >
> > > I've looked into updating NXP branch [lf-5.10.y], and it is not
> > > trivial... I'm now short on time to have a full swing of merging the
> > > latest stable update on top of it, but probably would get to this
> > > eventually. If there are any volunteers here that are willing to
> > > undertake this task - this would be really appreciated.
> > >
> > > > If no, then can I use "imx_v8_defconfig" from linux-imx repo to build kernel using linux-fslc repo?
> > >
> > > You can use the `defconfig` file, which is present in the layer to
> > > build [linux-fslc] for i.MX8 machine. It resides in
> > > recipes-kernel/linux/linux-fslc/armv8a/defconfig and is synchronized
> > > with stable kernel release 5.14.
> > >
> > > If you however opt-in for [linux-fslc-lts] kernel package, then the
> > > kernel config file would be taken from
> > > recipes-kernel/linux/linux-fslc-lts/armv8a/defconfig, which is also
> > > synchronized with 5.10 from stable.
> >
> > Thank you for sharing this insight, this is helpful
> >
> > > Are there any specific configuration options you need from
> > > imx_v8_defconfig, which should be present in the defconfig for
> > > mainline recipes?
> >
> > I haven't done any comparison yet between imx_v8_defconfig from 5.4-2.3.x-imx branch
> > and mainline defconfig but now I will do that since I know which defconfig is to be used :)
> >
> > > > i.MX8 is supported in linux-imx_5.10.bb recipe https://github.com/Freescale/meta-
> freescale/blob/325ad529187fb1309b0a889c5196c8df039aeea9/recipes-ke... which is using kernel from branch "lf-5.10.y" provided by
> linux-imx repo but this repo is NXP internal and doesn't get updated with stable Linux kernel. It is providing v5.10.35
> (https://source.codeaurora.org/external/imx/linux-imx/log/?h=lf-5.10.y)
> > >
> > > Correct, but as I've already pointed out - the merge of stable updates
> > > to this kernel base is not trivial... :/
> > > >
> > > > So ideally, just like v5.4 would like to use linux-fslc repo for v5.10 development as well.
> > > >
> > > >
> > > > Will appreciate any guidance around appropriate repo for v5.10 development for i.MX8
> > >
> > > As one of the things to try out: you can switch the BSP flavor to use
> > > "mainline" instead of "nxp", which would take all upstream components
> > > instead of those provided by NXP. Be aware, that if you rely on any
> > > functionality which is present in NXP BSP only (e.g. GPU/VPU) - this
> > > would be unavailable in Mainline BSP.
> >
> > We don't need GPU/VPU so will try your suggestion to use linux-fslc kernel
> > and defconfig from linux-fslc-lts/armv8a and see how it goes.
> >
> > Once again, thanks for your response and suggestions.
> >
> > > >
> > > > thanks
> > > > Ankur
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> > >
> > > --
> > > Regards,
> > > Andrey.
> >
> > Regards
> > Ankur
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> 
> --
> Regards,
> Andrey.

Regards
Ankur