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From: "chuck kamas" <chuckkamas@yahoo.com>
To: yocto@lists.yoctoproject.org
Subject: Raspberry PI enabling MMC1
Date: Mon, 16 Nov 2020 23:42:45 -0800	[thread overview]
Message-ID: <61df164e-fa3a-7517-33e8-db8ef0c8af92@yahoo.com> (raw)
In-Reply-To: 61df164e-fa3a-7517-33e8-db8ef0c8af92.ref@yahoo.com

Hi all,


I have been spinning my wheels for two days trying to discover how to 
enable MMC1 on a CM3. This is the one on GPIO22-27. I can boot Rasbian 
on the CM3 and it inits the MMC1 and its pins just fine. I can 
read/write to my SD card from it etc. However, when I build yocto it 
leaves the GPIOS22-27 in gpio mode and does not set them to MMC1 mode.  
I have tried changing the device tree as described here:

https://stackoverflow.com/questions/44702426/how-to-setup-an-own-device-tree-for-a-raspberrypi-in-yocto

That compiles and add the .dtbo to my build, but still the GPIOS are not 
set to MMC1 mode.

> cat /sys/kernel/debug/pinctrl/*gpio*/pinmux-pins
> Pinmux settings per pin
> Format: pin (name): mux_owner gpio_owner hog?
> ....
>
> pin 22 (gpio22): (MUX UNCLAIMED) (GPIO UNCLAIMED)
> pin 23 (gpio23): (MUX UNCLAIMED) (GPIO UNCLAIMED)
> pin 24 (gpio24): (MUX UNCLAIMED) (GPIO UNCLAIMED)
> pin 25 (gpio25): (MUX UNCLAIMED) (GPIO UNCLAIMED)
> pin 26 (gpio26): (MUX UNCLAIMED) (GPIO UNCLAIMED)
> pin 27 (gpio27): (MUX UNCLAIMED) (GPIO UNCLAIMED)
>
> .....
>
I have looked at:

https://ralimtek.com/raspberry%20pi/electronics/software/raspberry_pi_secondary_sd_card/


Any ideas of where to look next to turn on the sdio would be appreciated!


Chuck



       reply	other threads:[~2020-11-17  7:42 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <61df164e-fa3a-7517-33e8-db8ef0c8af92.ref@yahoo.com>
2020-11-17  7:42 ` chuck kamas [this message]
2020-11-17  8:08   ` [yocto] Raspberry PI enabling MMC1 Khem Raj
2020-11-18  0:29     ` chuck kamas
2020-11-18  0:29     ` chuck kamas
2020-11-18  0:29     ` chuck kamas
2020-11-18  0:29     ` chuck kamas
2020-11-20 17:52       ` Khem Raj
     [not found]     ` <16488BC657DA2093.23836@lists.yoctoproject.org>
2020-11-19  3:59       ` chuck kamas
2020-11-19  3:59       ` chuck kamas
     [not found]       ` <1648CCC040C7B594.8629@lists.yoctoproject.org>
2020-11-19  4:32         ` chuck kamas
2020-11-19  4:32         ` chuck kamas
2020-11-20 12:22           ` Erik Boto
2020-12-02  0:50             ` chuck kamas
2020-11-20 12:22           ` Erik Boto

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