Mity CPU Platforms » MitySOM-A10S Altera Arria 10

08/15/2023

MW 08:49 PM Software Development: RE: Mitysom a10s does not start under U-Boot 2021.04

Hi Dmitry,
The REFCLK_GXBL_ signals are AC coupled to the PLL chip, so the common mode
should be less of an issue.
With regards,
Mike Michael Williamson

DK 07:50 PM Software Development: RE: Mitysom a10s does not start under U-Boot 2021.04

Hi, Dan
I found discrepancy:
In Arria 10 and SI5338 datasheets voltage values are significantly different.
May be this is the reason why I don't see REFCLK_GXBL_... signal in Signal tap after divider?
Br, Dmitry.
Dmitry Kolotsei

DK 07:38 PM Software Development: RE: Replacement UBoot 2014.10 on 2021.04

Hi, Mike
I found than dedicated pins i2cemac2 were not configured well.
After fix this I saw the correct status 0x06 on the I2C bus and saw SI5338 is reconfigured.
Thank you.
Br, Dmitry. Dmitry Kolotsei

08/10/2023

MW 09:54 PM Software Development: RE: Replacement UBoot 2014.10 on 2021.04

Hi Dmitry,
Have you modified the HPS pin configuration from the reference project?
We are wondering if the I2C bus pins are not configured in the quartus project you are using for the I2C connected to the PLL chips. The chips shou... Michael Williamson

DK 03:22 PM Software Development: RE: Replacement UBoot 2014.10 on 2021.04

Thank you, Mike.
I will wait.
Additional info.
During the while cycle i2c status is 0x00.
Br, Dmitry
Dmitry Kolotsei

MW 02:55 PM Software Development: RE: Replacement UBoot 2014.10 on 2021.04

Hi Dmitry,
I see your request. I am consulting with some engineers here to figure out what is going on.
When I have an answer, I will post.
-Mike
Michael Williamson

DK 02:35 PM Software Development: RE: Replacement UBoot 2014.10 on 2021.04

Hi, Mike
I found the reason why PLL is not configured.
UBoot did not get access to I2C bus. The bus id busy.
I added debug output to source code and find function in which this arises.
drivers/i2c/designware_i2c.c
i2c_probe() ->... Dmitry Kolotsei