Mity CPU Platforms » MitySOM-335x (ARM Cortex-A8 Based Products)

04/08/2020

JC 08:27 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Srinivasa Wunnimani wrote:
> Hi,
> ...
What is your boot config for SD card boot and NAND boot? It would be the pull-up and pull-downs on the LCD_DATA0-11 pins. Jonathan Cormier

JC 07:40 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Srinivasa Wunnimani wrote:
> I want to test the same with pre-built binaries for u-boot V2018.01.
> ...
Hmm just checked an looks like we haven't released the 2019 MDK which has u-boot 2018 yet. So we don't have any prebuilt binaries ... Jonathan Cormier

SW 03:04 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
I understand your point.
Please find the log attached for SD boot and NAND boot attached.
I am trying to explain with respect to line numbers in log file "u-boot_debug_with_SD_boot_and_NAND_boot.txt"
Line 1 to 97 is SD Boot... Srinivasa Wunnimani

JC 01:06 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

huh is your sd card MLO and u-boot.img the same one you are programming into nand? Jonathan Cormier

04/07/2020

SW 03:33 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Is boot from nand a requirement to reproduce this?
> Yes. GPIO 0_27 (Relay chattering) happens only during NAND boot or any NAND operations.
I would expect it to behave the same when booted from SD card and reading from the NAND u... Srinivasa Wunnimani

04/06/2020

JC 07:58 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Thanks for the instructions to reproduce the problem. That is helpful.
Unfortunately though with the current virus going around, I don't have access to an oscilloscope to check the gpio pin for noise.
Question:
Is boot from na... Jonathan Cormier