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Bug#845422: [PATCH] Please add BCM2835 MMC driver for Raspberry Pi 3

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On Sat, Nov 26, 2016 at 12:05 AM, Aurelien Jarno <aurelien@aurel32.net>
wrote:

> On 2016-11-23 09:43, Michael Stapelberg wrote:
> > Source: linux
> > Severity: wishlist
> > Tags: patch
> >
> > Thank you for your work on maintaining the Linux kernel in Debian, I
> really
> > appreciate it!
> >
> > I am interested in running Debian on the Raspberry Pi 3.
> >
> > As per https://github.com/anholt/linux/wiki/Raspberry-Pi-3, the
> mainline Linux
> > kernel in version 4.8 includes support for the Raspberry Pi 3, so we are
> in
> > pretty good shape already.
> >
> > However, when trying to boot linux-image-4.8.0-1-arm64 version 4.8.5-1, I
> > noticed that the kernel can’t find any block devices (and hence no root
> file
> > system). This is because the bcm2835-sdhost MMC driver has not actually
> made it
> > into Linux 4.8; it is still under review:
> > https://www.spinics.net/lists/arm-kernel/msg513433.html
>
> While this is correct, please note that the BCM2835 has two sdhost
> controller, one that can be used for the wireless card and one for the
> sdcard. The 4.8 kernel already has support for the other sdhost
> controller, namely the iProc one. You can use this one for your root
> filesystem as it is built in the Debian kernel.
>
> I guess you have a problem somewhere, maybe in the device tree that
> causes the wrong SD controller to be used. I use the device tree that is
> provided by the kernel:
>

Thanks for pointing this out! I must have indeed messed up the DTB while
testing. I just installed linux-image-4.8.0-1-arm64 without any
modifications and could indeed still boot successfully. So, this bug is no
longer a blocker for Raspberry Pi 3 support, but would still be good to get
fixed to enable us to make progress on the WiFi card support.


>
> |                sdhci: sdhci@7e300000 {
> |                        compatible = "brcm,bcm2835-sdhci";
> |                        reg = <0x7e300000 0x100>;
> |                        interrupts = <2 30>;
> |                        clocks = <&clocks BCM2835_CLOCK_EMMC>;
> |                        status = "disabled";
> |                };
>
> This work since at least kernel 4.8.4-1~exp1.
>
> Aurelien
>
> --
> Aurelien Jarno                          GPG: 4096R/1DDD8C9B
> aurelien@aurel32.net                 http://www.aurel32.net
>



-- 
Best regards,
Michael

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Bug#845422: [PATCH] Please add BCM2835 MMC driver for Raspberry Pi 3 Aurelien Jarno <aurelien@aurel32.net> - 2016-11-26 00:10 +0100
  Bug#845422: [PATCH] Please add BCM2835 MMC driver for Raspberry Pi 3 Michael Stapelberg <stapelberg@debian.org> - 2016-11-26 11:00 +0100

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