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It ships with an outdated version of https://github.com/Freescale/linux-fs=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ith an outdated version of 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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