Just a follow up from our IRC discussion with more clarifications. * This is an industrial board/product from a 3rd-party manufacturer, based on AM3352 SoC. It's custom enough, as obviously EVM images don't boot.
* The manufacturer did not provide sources or instructions with the board, only SD card binary images. * Boot log from those images indicate U-boot 2014.07 and kernel 3.14.43, which are quite ancient Getting recent u-boot and kernel working on this board will require recreating board configs and updating old DTS. Not sure mixing old u-boot with new kernel is a good idea either - still need to massage DTS... Maybe our BSP experts here can pitch in and comment on feasibility of this effort. It's definitely not Yocto specific though. On Mon, Mar 29, 2021 at 12:43:09AM -0700, [email protected] wrote: > Hello everyone, > > first time yocto user here, I'm trying to get a very minimal image to boot > on a AM3352 based device that a local company made, however when it boots > there is no output on the serial port. > > These are the steps I've tried: > - added meta-ti and dependent layers > - removed these features from the minimal image "alsa ext2 api-documentation > bluetooth ipv6 opengl pcmcia ppp ptest wayland wifi x11 vulkan" as I don't > think are needed for our basic test > - taken the dtb file from the manufacturer sd card, converted to dts using > dtc, added to the kernel using a layer and changed KERNEL_DEVICETREE = > "device-name-here.dtb" (name replaced) > - I've cloned their SD card to make sure the partitions are the same (FAT16 > first partition with boot flag + ext4 second partition) > - bitbake build > - replaced MLO/u-boot.img in the boot partition > - extracted rootfs into the ext4 partition, copied zImage and the dtb files > in the /boot folder > > I've also tried to use am335x-hs-evm as the machine (using also the UART > variants of MLO and U-boot) but no luck. > In case it's needed, these are the env variables from their working SD card > u-boot > > https://gist.github.com/alex88/5e8d604ab15540b84353040a83bc0606 > > What should I try to at least be able to get u-boot to output something in > the console? > > Thank you in advance -- Regards, Denys Dmytriyenko <[email protected]> PGP: 0x420902729A92C964 - https://denix.org/0x420902729A92C964 Fingerprint: 25FC E4A5 8A72 2F69 1186 6D76 4209 0272 9A92 C964
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