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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