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...
Chuck On 11/18/20 7:59 PM, chuck kamas via lists.yoctoproject.org wrote:
Raj, I found out how to debug the boot process of the PI from: https://github.com/raspberrypi/documentation/blob/master/hardware/raspberrypi/bootmodes/README.md 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.txtSo 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?Chuck On 11/17/20 4:29 PM, chuck kamas via lists.yoctoproject.org wrote:Raj,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:dtoverlay=sdio,poll_once=offI have attached the entire file: config.txt.yoctoHowever, the Rasbian image does not have any mention of the dtoverlay for the sdio. Curious. See config.txt attached.Thanks for the help! Chuck On 11/17/20 12:08 AM, Khem Raj wrote:On Mon, Nov 16, 2020 at 11:43 PM chuck kamas via lists.yoctoproject.org <[email protected]> wrote: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-yoctoThat compiles and add the .dtbo to my build, but still the GPIOS are notset 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!what does /boot/config.txt look like on raspbian and yocto built imagesChuck
devicetree-rpi_cm-overlay.dts
Description: audio/vnd.dts
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