I did post it there but it seems out of scope for the forum. https://e2e.ti.com/support/processors/f/processors-forum/989464/am3352-u-boot-not-showing-any-output-in-the-serial-console
-- Alessandro Tagliapietra On Mon, Mar 29, 2021 at 6:20 PM Bajjuri, Praneeth <[email protected]> wrote: > > > On 3/29/2021 1:42 PM, Denys Dmytriyenko wrote: > > 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 > > The right place for this query is TI e2e . Please post your question > there for someone to help. > > few related threads already in e2e addressing similar topic. > > > https://e2e.ti.com/support/processors/f/processors-forum/852197/am3358-u-boot-fails > > > https://e2e.ti.com/support/processors/f/processors-forum/945637/processor-sdk-am335x-how-to-boot-bone-black-over-uart > > > https://e2e.ti.com/support/processors/f/processors-forum/927764/am3352-start-u-boot-from-usd > > Good luck > > > >> > >> 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 > > > > > > > > > > >
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