From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Linux on an E-Ink Tablet
To: meta-freescale@lists.yoctoproject.org
From: "Alistair Francis" <alistair23@gmail.com>
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Date: Thu, 04 Feb 2021 21:21:19 -0800
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Hey,

I have been working on updating the Linux kernel of the reMarkable 2, whic=
h is an E-Ink tablet using the i.MX7D.

It ships with an outdated version of https://github.com/Freescale/linux-fs=
lc/tree/4.14-1.0.x-imx with around 300 patches on top, the source is here: =
https://github.com/reMarkable/linux/tree/zero-sugar.

I have ported those 300 patches on top of https://github.com/Freescale/lin=
ux-fslc/tree/5.4-2.2.x-imx and have it mostly working. I'm just struggling =
with the brcmfmac WiFi.

I'm now starting to look at what next though.

I don't see a 5.10*-imx branch, just a 5.10.x+fslc. Does anyone know if th=
ere is a plan for a 5.10*-imx branch?

Also the E-Ink display is driven by the video/fbdev/mxsfb.c=C2=A0 driver, =
which has been removed in mainline ( https://github.com/torvalds/linux/comm=
it/f225f1393f034e17281274180626086276da766c ), I was wondering if anyone kn=
ows how to swap drivers without changing the user space software (which is =
closed source).

I'm also working on trying to upstream some of the work. It seems like the=
re is a lot in the *-imx branches that isn't upstream. Is that something th=
at is still going on?

Alistair

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Hey,<br /><br />I have been working on updating the Linux kernel of the reM=
arkable 2, which is an E-Ink tablet using the i.MX7D.<br /><br />It ships w=
ith an outdated version of <a href=3D"https://github.com/Freescale/linux-fs=
lc/tree/4.14-1.0.x-imx" target=3D"_blank" rel=3D"noopener">https://github.c=
om/Freescale/linux-fslc/tree/4.14-1.0.x-imx</a> with around 300 patches on =
top, the source is here: https://github.com/reMarkable/linux/tree/zero-suga=
r.<br /><br />I have ported those 300 patches on top of&nbsp; <a href=3D"ht=
tps://github.com/Freescale/linux-fslc/tree/5.4-2.2.x-imx" target=3D"_blank"=
 rel=3D"noopener">https://github.com/Freescale/linux-fslc/tree/5.4-2.2.x-im=
x</a> and have it mostly working. I'm just struggling with the brcmfmac WiF=
i.<br /><br />I'm now starting to look at what next though.<br /><br />I do=
n't see a 5.10*-imx branch, just a 5.10.x+fslc. Does anyone know if there i=
s a plan for a 5.10*-imx branch?<br /><br />Also the E-Ink display is drive=
n by the video/fbdev/mxsfb.c&nbsp; driver, which has been removed in mainli=
ne (<a href=3D"https://github.com/torvalds/linux/commit/f225f1393f034e17281=
274180626086276da766c" target=3D"_blank" rel=3D"noopener">https://github.co=
m/torvalds/linux/commit/f225f1393f034e17281274180626086276da766c</a>), I wa=
s wondering if anyone knows how to swap drivers without changing the user s=
pace software (which is closed source).<br /><br />I'm also working on tryi=
ng to upstream some of the work. It seems like there is a lot in the *-imx =
branches that isn't upstream. Is that something that is still going on?<br =
/><br />Alistair

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From: "Otavio Salvador" <otavio.salvador@ossystems.com.br>
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Subject: Re: [meta-freescale] Linux on an E-Ink Tablet
To: Alistair Francis <alistair23@gmail.com>
Cc: meta-freescale@lists.yoctoproject.org
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--000000000000a2e7af05ba963ef0
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Hello Alistair,

Em sex., 5 de fev. de 2021 =C3=A0s 02:21, Alistair Francis <alistair23@gmai=
l.com>
escreveu:

> I have been working on updating the Linux kernel of the reMarkable 2,
> which is an E-Ink tablet using the i.MX7D.
>
> It ships with an outdated version of
> https://github.com/Freescale/linux-fslc/tree/4.14-1.0.x-imx with around
> 300 patches on top, the source is here:
> https://github.com/reMarkable/linux/tree/zero-sugar.
>
> I have ported those 300 patches on top of
> https://github.com/Freescale/linux-fslc/tree/5.4-2.2.x-imx and have it
> mostly working. I'm just struggling with the brcmfmac WiFi.
>
> I'm now starting to look at what next though.
>
> I don't see a 5.10*-imx branch, just a 5.10.x+fslc. Does anyone know if
> there is a plan for a 5.10*-imx branch?
>

It will be created when NXP does a GA release on top of this. The -imx
branch is based on their fork and on top of it we do the needed fixes and
merge stable updates as well.

Also the E-Ink display is driven by the video/fbdev/mxsfb.c  driver, which
> has been removed in mainline (
> https://github.com/torvalds/linux/commit/f225f1393f034e172812741806260862=
76da766c),
> I was wondering if anyone knows how to swap drivers without changing the
> user space software (which is closed source).
>
> I'm also working on trying to upstream some of the work. It seems like
> there is a lot in the *-imx branches that isn't upstream. Is that somethi=
ng
> that is still going on?
>

All things which are clean could be sent upstream. It'd be of great help as
it'd reduce the maintenance work.

--=20
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9 9981-7854          Mobile: +1 (347) 903-9750

--000000000000a2e7af05ba963ef0
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<div dir=3D"ltr"><div dir=3D"ltr">Hello Alistair,<br></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">Em sex., 5 de fev. d=
e 2021 =C3=A0s 02:21, Alistair Francis &lt;<a href=3D"mailto:alistair23@gma=
il.com">alistair23@gmail.com</a>&gt; escreveu:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">I have been working on updating the Linux =
kernel of the reMarkable 2, which is an E-Ink tablet using the i.MX7D.<br><=
br>It ships with an outdated version of <a href=3D"https://github.com/Frees=
cale/linux-fslc/tree/4.14-1.0.x-imx" rel=3D"noopener" target=3D"_blank">htt=
ps://github.com/Freescale/linux-fslc/tree/4.14-1.0.x-imx</a> with around 30=
0 patches on top, the source is here: <a href=3D"https://github.com/reMarka=
ble/linux/tree/zero-sugar" target=3D"_blank">https://github.com/reMarkable/=
linux/tree/zero-sugar</a>.<br><br>I have ported those 300 patches on top of=
=C2=A0 <a href=3D"https://github.com/Freescale/linux-fslc/tree/5.4-2.2.x-im=
x" rel=3D"noopener" target=3D"_blank">https://github.com/Freescale/linux-fs=
lc/tree/5.4-2.2.x-imx</a> and have it mostly working. I&#39;m just struggli=
ng with the brcmfmac WiFi.<br><br>I&#39;m now starting to look at what next=
 though.<br><br>I don&#39;t see a 5.10*-imx branch, just a 5.10.x+fslc. Doe=
s anyone know if there is a plan for a 5.10*-imx branch?<br></blockquote><d=
iv><br></div><div>It will be created when NXP does a GA release on top of t=
his. The -imx branch is based on their fork and on top of it we do the need=
ed fixes and merge stable updates as well.</div><div> <br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">Also the E-Ink display is driven by =
the video/fbdev/mxsfb.c=C2=A0 driver, which has been removed in mainline (<=
a href=3D"https://github.com/torvalds/linux/commit/f225f1393f034e1728127418=
0626086276da766c" rel=3D"noopener" target=3D"_blank">https://github.com/tor=
valds/linux/commit/f225f1393f034e17281274180626086276da766c</a>), I was won=
dering if anyone knows how to swap drivers without changing the user space =
software (which is closed source).<br><br>I&#39;m also working on trying to=
 upstream some of the work. It seems like there is a lot in the *-imx branc=
hes that isn&#39;t upstream. Is that something that is still going on?<br>
</blockquote></div><div><br></div><div>All things which are clean could be =
sent upstream. It&#39;d be of great help as it&#39;d reduce the maintenance=
 work.<br></div><br>-- <br><div dir=3D"ltr" class=3D"gmail_signature">Otavi=
o Salvador =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 O.S. Systems<br><a href=3D"http://www.os=
systems.com.br" target=3D"_blank">http://www.ossystems.com.br</a> =C2=A0 =
=C2=A0 =C2=A0 =C2=A0<a href=3D"http://code.ossystems.com.br" target=3D"_bla=
nk">http://code.ossystems.com.br</a><br>Mobile: +55 (53) 9 9981-7854 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0Mobile: +1 (347) 903-9750</div></div>

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From: "Alistair Francis" <alistair23@gmail.com>
Date: Fri, 5 Feb 2021 16:20:17 -0800
Message-ID: <CAKmqyKMs+a70TaQopXJhJ6X9ya663s1s2EhROGedY17Q4_PCSw@mail.gmail.com>
Subject: Re: [meta-freescale] Linux on an E-Ink Tablet
To: Otavio Salvador <otavio.salvador@ossystems.com.br>
Cc: meta-freescale@lists.yoctoproject.org
Content-Type: text/plain; charset="UTF-8"
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On Fri, Feb 5, 2021 at 4:49 AM Otavio Salvador
<otavio.salvador@ossystems.com.br> wrote:
>
> Hello Alistair,
>
> Em sex., 5 de fev. de 2021 =C3=A0s 02:21, Alistair Francis <alistair23@gm=
ail.com> escreveu:
>>
>> I have been working on updating the Linux kernel of the reMarkable 2, wh=
ich is an E-Ink tablet using the i.MX7D.
>>
>> It ships with an outdated version of https://github.com/Freescale/linux-=
fslc/tree/4.14-1.0.x-imx with around 300 patches on top, the source is here=
: https://github.com/reMarkable/linux/tree/zero-sugar.
>>
>> I have ported those 300 patches on top of  https://github.com/Freescale/=
linux-fslc/tree/5.4-2.2.x-imx and have it mostly working. I'm just struggli=
ng with the brcmfmac WiFi.
>>
>> I'm now starting to look at what next though.
>>
>> I don't see a 5.10*-imx branch, just a 5.10.x+fslc. Does anyone know if =
there is a plan for a 5.10*-imx branch?
>
>
> It will be created when NXP does a GA release on top of this. The -imx br=
anch is based on their fork and on top of it we do the needed fixes and mer=
ge stable updates as well.

Ah ok. So the *-fslc branch is the community branch and the *-imx
branch is the NXP branch merged with the community branch?

>
>> Also the E-Ink display is driven by the video/fbdev/mxsfb.c  driver, whi=
ch has been removed in mainline (https://github.com/torvalds/linux/commit/f=
225f1393f034e17281274180626086276da766c), I was wondering if anyone knows h=
ow to swap drivers without changing the user space software (which is close=
d source).
>>
>> I'm also working on trying to upstream some of the work. It seems like t=
here is a lot in the *-imx branches that isn't upstream. Is that something =
that is still going on?
>
>
> All things which are clean could be sent upstream. It'd be of great help =
as it'd reduce the maintenance work.

Ah, I think I misspoke. I'm trying to upstream the rM2 specific
changes, but it depends on changes from the *-imx branch. I was
wondering if the *-imx branch will be fully upstreamed. It sounds like
that is up to NXP though.

Alistair

>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9 9981-7854          Mobile: +1 (347) 903-9750

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Date: Fri, 5 Feb 2021 21:28:31 -0300
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Subject: Re: [meta-freescale] Linux on an E-Ink Tablet
To: Alistair Francis <alistair23@gmail.com>
Cc: meta-freescale@lists.yoctoproject.org
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Em sex., 5 de fev. de 2021 =C3=A0s 21:20, Alistair Francis <alistair23@gmai=
l.com>
escreveu:

> On Fri, Feb 5, 2021 at 4:49 AM Otavio Salvador
> <otavio.salvador@ossystems.com.br> wrote:
> > It will be created when NXP does a GA release on top of this. The -imx
> branch is based on their fork and on top of it we do the needed fixes and
> merge stable updates as well.
>
> Ah ok. So the *-fslc branch is the community branch and the *-imx
> branch is the NXP branch merged with the community branch?
>

Yes, you got it right.

> All things which are clean could be sent upstream. It'd be of great help
> as it'd reduce the maintenance work.
>
> Ah, I think I misspoke. I'm trying to upstream the rM2 specific
> changes, but it depends on changes from the *-imx branch. I was
> wondering if the *-imx branch will be fully upstreamed. It sounds like
> that is up to NXP though.
>

Sure but in the process, we often find things that are easy to upstream and
help to reduce the delta.

--=20
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9 9981-7854          Mobile: +1 (347) 903-9750

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">Em sex., 5 de fev. de 2021 =C3=A0s 21=
:20, Alistair Francis &lt;<a href=3D"mailto:alistair23@gmail.com">alistair2=
3@gmail.com</a>&gt; escreveu:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex">On Fri, Feb 5, 2021 at 4:49 AM Otavio Salvador<br>
&lt;<a href=3D"mailto:otavio.salvador@ossystems.com.br" target=3D"_blank">o=
tavio.salvador@ossystems.com.br</a>&gt; wrote:<br>&gt; It will be created w=
hen NXP does a GA release on top of this. The -imx branch is based on their=
 fork and on top of it we do the needed fixes and merge stable updates as w=
ell.<br>
<br>
Ah ok. So the *-fslc branch is the community branch and the *-imx<br>
branch is the NXP branch merged with the community branch?<br></blockquote>=
<div><br></div><div>Yes, you got it right.</div><div> <br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">
&gt; All things which are clean could be sent upstream. It&#39;d be of grea=
t help as it&#39;d reduce the maintenance work.<br>
<br>
Ah, I think I misspoke. I&#39;m trying to upstream the rM2 specific<br>
changes, but it depends on changes from the *-imx branch. I was<br>
wondering if the *-imx branch will be fully upstreamed. It sounds like<br>
that is up to NXP though.<br>
</blockquote></div><div><br></div><div>Sure but in the process, we often fi=
nd things that are easy to upstream and help to reduce the delta.<br></div>=
<br>-- <br><div dir=3D"ltr" class=3D"gmail_signature">Otavio Salvador =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 O.S. Systems<br><a href=3D"http://www.ossystems.com.br=
" target=3D"_blank">http://www.ossystems.com.br</a> =C2=A0 =C2=A0 =C2=A0 =
=C2=A0<a href=3D"http://code.ossystems.com.br" target=3D"_blank">http://cod=
e.ossystems.com.br</a><br>Mobile: +55 (53) 9 9981-7854 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0Mobile: +1 (347) 903-9750</div></div>

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From: "Alistair Francis" <alistair23@gmail.com>
Date: Fri, 5 Feb 2021 16:36:16 -0800
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Subject: Re: [meta-freescale] Linux on an E-Ink Tablet
To: Otavio Salvador <otavio.salvador@ossystems.com.br>
Cc: meta-freescale@lists.yoctoproject.org
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On Fri, Feb 5, 2021 at 4:28 PM Otavio Salvador
<otavio.salvador@ossystems.com.br> wrote:
>
>
>
> Em sex., 5 de fev. de 2021 =C3=A0s 21:20, Alistair Francis <alistair23@gm=
ail.com> escreveu:
>>
>> On Fri, Feb 5, 2021 at 4:49 AM Otavio Salvador
>> <otavio.salvador@ossystems.com.br> wrote:
>> > It will be created when NXP does a GA release on top of this. The -imx=
 branch is based on their fork and on top of it we do the needed fixes and =
merge stable updates as well.
>>
>> Ah ok. So the *-fslc branch is the community branch and the *-imx
>> branch is the NXP branch merged with the community branch?
>
>
> Yes, you got it right.

Ok, now I understand. I also realised that the *-fslc has a small
delta with mainline which is great to see!

The 5.4*-imx is not as good in that regard :(

>
>> > All things which are clean could be sent upstream. It'd be of great he=
lp as it'd reduce the maintenance work.
>>
>> Ah, I think I misspoke. I'm trying to upstream the rM2 specific
>> changes, but it depends on changes from the *-imx branch. I was
>> wondering if the *-imx branch will be fully upstreamed. It sounds like
>> that is up to NXP though.
>
>
> Sure but in the process, we often find things that are easy to upstream a=
nd help to reduce the delta.

Makes sense. Hopefully the next 5.10*-imx release has a smaller diff
from mainline then and I can go from there, upstreaming the parts I'm
interested in.

Alistair

>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9 9981-7854          Mobile: +1 (347) 903-9750