Re: moving to same chip, different board: no console output

[David Picard <david.picard@clermont.in2p3.fr>]

Hello,

I took the same Buildroot configuration. I replaced the .dts* files with 
the ones provided by the new board BSP. Actually, they differ quite a 
lot from the Altera SoC FPGA .dts* files in the Linux tree. Then, I 
compiled and flashed the SD card.

I enabled CONFIG_DEBUG_LL with no change. CONFIG_DEBUG_PBL doesn't exist 
in my case. For some reason, the defconfig I built upon, uses Barebox 
v2021.07.0, which is probably outdated...

David

Le 06/06/2025 à 19:46, Ahmad Fatoum a écrit :
> Hello David,
>
> On 06.06.25 16:43, David Picard wrote:
>> Hello,
>>
>> I am working on a project for which we selected an Intel/Altera Cyclone 5 SoC FPGA (an FPGA with an ARM core). As the project evolves, I have to change boards and I am facing issues to boot: absolutely no output on the serial console (USB virtual COM port), not even from Barebox.
>>
>> Previous working configuration:
>> - SD card image produced by Buildroot with Barebox as the bootloader
>> - Terasic ADC-SoC demo board, booting from the SD card.
>> https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&No=1061&PartNo=1
>>
>> Current non-working configuration:
>> - Eclustra Mercury+ SA2 module, also with a Cyclone 5, plus SDRAM, RTC, QSPI flash, etc. I think that the main difference between both Cyclone 5 chips is the size of the logic section is bigger on the module. The module has more RAM.
>> https://www.enclustra.com/en/products/system-on-chip-modules/mercury-sa2/
>> - Enclustra ST1 demo baseboard. It has a JTAG port, should this information be of interest.
>> https://www.enclustra.com/en/products/base-boards/mercury-st1/
>>
>> I the current configuration, I get no output on the serial console.
> So you tried to use the exact same image on both boards or were
> there changes?
>
>> What I did:
>> - I checked the hardware configuration (switches to select booting from the SD card and USB config) with a bare-metal application provided by Enclustra.
>> - I used Enclutra's .dts and .dtsi files, which differ very slightly from the Linux kernel tree files.
>> - I checked how the SD card is connected: to the exact same pins in both configurations.
>> - I had a look at Barebox menuconfig, but nothing caught my eye.
>>
>> So, now I'm stuck, and I'm looking for some guidance.
> You can try enabling CONFIG_DEBUG_LL and CONFIG_DEBUG_PBL and see if you
> get some debugging output maybe. You'll have to choose which UART to use.
>
> I think your new SoM may have different RAM and thus you can't use the
> same image, but need one suitable to RAM integrated on your new board.
>
> Cheers,
> Ahmad
>
>> David
>>
>>
>>
>