# AM335x SoC Kernel Change: version 4.x to 5.x **URL:** \ **Category:** Linux Discussions\ **Created:** [April 20, 2022, 8:32pm UTC](https://forum.digikey.com/t/am335x-soc-kernel-change-version-4-x-to-5-x/21732 "2022-04-20T20:32:18Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![cmg](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@cmg](https://forum.digikey.com/u/cmg)\ **Post date:** [April 20, 2022, 8:32pm UTC](https://forum.digikey.com/t/am335x-soc-kernel-change-version-4-x-to-5-x/21732/1 "2022-04-20T20:32:18Z")
Hello! We have been running kernel 4.8 with Robert C. Nelson’s patches for years on our custom embedded AM335x platform (thank you!). Our device uses many of the same components as the Beaglebone Black, including the TLV320AIC3x audio codec. We have created a custom DTS for our board, but otherwise, not made changes to his am33x-v4.8 patched kernel. I’ve recently attempted to upgrade the kernel to LTS versions 5.4 and 5.10 by following the RobertCNelson/bb-kernel github instructions. I then added our DTS files and built the kernel with our board’s defconfig. I ran into several issues running these 5.x kernel versions: Kernel 5.4 boots OK, but the soundcard is not found: aplay: device\_list:270: no soundcards found… It looks like the davinci and omap sound directories were merged into the sound/soc/ti directory, and the davinci-evm machine driver config option (SND\_AM33XX\_SOC\_EVM) we were using was removed: [https://lkml.kernel.org/lkml/20181217122142.6652-1-peter.ujfalusi@ti.com/](https://lkml.kernel.org/lkml/20181217122142.6652-1-peter.ujfalusi@ti.com/) With our old kernel defconfig, the davinci-evm driver was not being built in the 5.4 kernel, so I tried to build it with the SND\_SOC\_DAVINCI\_EVM config option, but this depends on ARCH\_DAVINCI, which depends on ARCH\_MULTI\_V5; this apparently conflicts with ARCH\_MULTI\_V7, which is used for the ARMv7 Cortex-A platform. Even when I build the davinci-evm driver with a different defconfig or hack, I still do not see the soundcard. Has anyone run into anything like this with the Beaglebone Black running kernel 5.4? Maybe there is something else I need to adjust in my kernel config and/or DTS with this kernel change? I was originally hoping to get kernel 5.10 working on our board, but I ran into an entirely different problem: the kernel wouldn’t boot; it would just hang here when starting: Starting kernel … We are booting the image from an eMMC, but it looks like this could be problematic? > **[Latest kernel supported on beaglebone black.](https://forum.beagleboard.org/t/latest-kernel-supported-on-beaglebone-black/2622)** > > Hello everyone, I am new to beaglebone. I want to know what is the latest kernel version supported on beaglebone black, and where to find the source tree for it? Furthermore is there any place where I can keep track of it beagleboard.org doesn’t has... I will keep investigating, but any help or insight you can provide would be greatly appreciated. Thank you! ---
**Author:** ![RobertCNelson](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/robertcnelson/32/12_2.png) [@RobertCNelson](https://forum.digikey.com/u/RobertCNelson)\ **Post date:** [April 21, 2022, 1:21pm UTC](https://forum.digikey.com/t/am335x-soc-kernel-change-version-4-x-to-5-x/21732/2 "2022-04-21T13:21:12Z")
Hi @cmg , On your old 4.8.x kernel, which modules are loaded? (lsmod)… We can patch the Kconfig to build them on MULTI\_V7… Sorry, i don’t test sound very often, but v5.10.x-ti did make some noise on a lcd with speakers… (didn’t realize the lcd had built-in speakers…) Do you have a boot log of eMMC? Regards, ---
**Author:** ![cmg](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@cmg](https://forum.digikey.com/u/cmg)\ **Post date:** [April 25, 2022, 11:03pm UTC](https://forum.digikey.com/t/am335x-soc-kernel-change-version-4-x-to-5-x/21732/3 "2022-04-25T23:03:55Z")
Hi Robert, Thank you for the response. Here is a list of the loaded modules when running kernel 4.8: ```auto Module Size Used by cppi41 7511 60 musb_dsps 8831 0 musb_hdrc 112736 1 musb_dsps phy_am335x 2591 6 phy_generic 5439 1 phy_am335x phy_am335x_control 3129 1 phy_am335x snd_soc_evm 4812 0 ti_am335x_adc 5754 0 kfifo_buf 3452 1 ti_am335x_adc industrialio 47155 2 ti_am335x_adc,kfifo_buf snd_soc_davinci_mcasp 16847 2 snd_soc_edma 1309 1 snd_soc_davinci_mcasp snd_soc_omap 3514 1 snd_soc_davinci_mcasp snd_soc_tlv320aic3x 48232 1 snd_soc_core 167304 5 snd_soc_davinci_mcasp,snd_soc_edma,snd_soc_evm,snd_soc_omap,snd_soc_tlv320aic3x snd_pcm_dmaengine 5676 2 snd_soc_omap,snd_soc_core snd_pcm 94259 5 snd_soc_davinci_mcasp,snd_pcm_dmaengine,snd_soc_omap,snd_soc_core,snd_soc_tlv320aic3x musb_am335x 1566 0 snd_timer 22063 1 snd_pcm snd 62946 3 snd_timer,snd_soc_core,snd_pcm soundcore 7445 1 snd ti_am335x_tscadc 5837 1 ti_am335x_adc ``` When running kernel 5.10 (v5.10.106-bone62), here is the boot log before getting stuck at “Starting kernel …”: ```auto Watchdog enabled I2C: ready DRAM: 512 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Using default environment Net: not set. Validating first E-fuse MAC cpsw Hit any key to stop autoboot: 0 gpio: pin 53 (gpio 53) value is 1 Card did not respond to voltage select! Card did not respond to voltage select! gpio: pin 56 (gpio 56) value is 0 gpio: pin 55 (gpio 55) value is 0 gpio: pin 54 (gpio 54) value is 0 switch to partitions #0, OK mmc1(part 0) is current device gpio: pin 54 (gpio 54) value is 1 gpio: pin 31 (gpio 31) value is 1 RTFM not pressed: booting normally Checking for: /uEnv.txt ... reading uEnv.txt 943 bytes read in 4 ms (229.5 KiB/s) gpio: pin 55 (gpio 55) value is 1 Loaded environment from uEnv.txt Importing environment from mmc ... Checking if uenvcmd is set ... gpio: pin 56 (gpio 56) value is 1 Running uenvcmd ... Loading image from mmc... reading zImage3 9490944 bytes read in 519 ms (17.4 MiB/s) Loadng DT from mmc... reading cyberdata-intercomv4.dtb 63982 bytes read in 11 ms (5.5 MiB/s) Kernel image @ 0x82000000 [0x000000 - 0x90d200] ## Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Using Device Tree in place at 88000000, end 880129ed Starting kernel ... ``` Note: when running kernel, 5.4 (v5.4.182-bone64), the board boots, but I run into the “no soundcards found…” issue when attempting to play audio. I look forward to hearing from you. Thanks! ---
**Author:** ![RobertCNelson](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/robertcnelson/32/12_2.png) [@RobertCNelson](https://forum.digikey.com/u/RobertCNelson)\ **Post date:** [April 26, 2022, 2:09pm UTC](https://forum.digikey.com/t/am335x-soc-kernel-change-version-4-x-to-5-x/21732/4 "2022-04-26T14:09:03Z")
> [@cmg](#): > > ```auto > Running uenvcmd ... > Loading image from mmc... > reading zImage3 > 9490944 bytes read in 519 ms (17.4 MiB/s) > Loadng DT from mmc... > reading cyberdata-intercomv4.dtb > 63982 bytes read in 11 ms (5.5 MiB/s) > Kernel image @ 0x82000000 [0x000000 - 0x90d200] > ## Flattened Device Tree blob at 88000000 > Booting using the fdt blob at 0x88000000 > Using Device Tree in place at 88000000, end 880129ed > > Starting kernel ... > > ``` Enable earlyprintk… Probably mmc configuration… Without seeing your DTS source, that’s a just a guess… Regards,