On Thu, Nov 19, 2020 at 7:21 PM chuck kamas via lists.yoctoproject.org
Making some progress here!
I added a compiled version of the attached device tree and now the mmc1 shows up in my yocto image! Yes! Now I need to find out the secret magic in that tree that I need to add...
If I'm not mistaken that should be done by appending
RPI_KERNEL_DEVICETREE_OVERLAYS. If you don't have your own custom
machine configuration where this could be added, try adding the
following to local.conf:
RPI_KERNEL_DEVICETREE_OVERLAYS_append = " overlays/sdio.dtbo "
On 11/18/20 7:59 PM, chuck kamas via lists.yoctoproject.org wrote:
I found out how to debug the boot process of the PI from:
by turning on the boot code debug.
sed -i -e "s/BOOT_UART=0/BOOT_UART=1/" bootcode.bin
I found out that the sdio overlay does not exist!
MESS:00:00:07.868162:0: dtdebug: Failed to open overlay file 'overlays/sdio.dtbo'
MESS:00:00:07.874093:0: Failed to load overlay 'sdio'
MESS:00:00:07.878881:0: brfs: File read: /mfs/sd/overlays/sdio.dtbo
MESS:00:00:07.891322:0: brfs: File read: /mfs/sd/cmdline.txt
So what am I missing on how to turn on the sdio on GPIO22-27? Is it not an overlay and instead a driver/other code/linux config that needs to be set?
On 11/17/20 4:29 PM, chuck kamas via lists.yoctoproject.org wrote:
Thanks for taking the time to respond. I thought of that too. My custom Yocto build has the line to turn on the sdio in it:
I have attached the entire file: config.txt.yocto
However, the Rasbian image does not have any mention of the dtoverlay for the sdio. Curious. See config.txt attached.
Thanks for the help!
On 11/17/20 12:08 AM, Khem Raj wrote:
On Mon, Nov 16, 2020 at 11:43 PM chuck kamas via
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:
That compiles and add the .dtbo to my build, but still the GPIOS are not
set to MMC1 mode.
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:
Any ideas of where to look next to turn on the sdio would be appreciated!
what does /boot/config.txt look like on raspbian and yocto built images