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

03/14/2020

SW 11:52 AM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Sorry for typo error:
I was able to manual write it to GPMC *without* any error.
Regards
Srinivasa Srinivasa Wunnimani

SW 08:47 AM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
I tried to change GPMC_CONFIG7_0 to 0x48 from 0xf48 as below. I was able to manual write it to GPMC with any error.
md.b 0x50000070 10
mw.b 0x50000078 48
mw.b 0x50000079 00
But after executing below read command, boar... Srinivasa Wunnimani

03/11/2020

JC 01:41 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

You can use md to read memory locations and mw to write them. https://www.denx.de/wiki/publish/DULG/to-delete/UBootCmdGroupMemory.html Jonathan Cormier

SW 11:13 AM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
Manually means, do you want me to change GPMC_CONFIG7_0 at u-boot prompt?
Regards
Srinivasa Srinivasa Wunnimani

SW 10:45 AM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
With u-boot V2013 frequency of pulses @ ~3.571 MHz and amplitude ~150 mV.
With u-boot V2018 frequency of pulses @ ~3.571 KHz and amplitude ~ 3.2 V.
Please find images attached.
Regards
Srinivasa
Srinivasa Wunnimani

03/09/2020

JC 03:02 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

If you manually set GPMC_CONFIG7_0 back to 48, does the activity on GPIO 0_27 stop?
Jonathan Cormier

BD 02:27 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Srinivasa,
We have not seen this before and I am reviewing your comments and logs.
Diff of GPMC registers Bob Duke

SW 01:23 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
I have dumped the values of GPMC registers for u-boot V2013.10 and V2018 at u-boot prompt. Please find the files attached.
I am little confused with V2018:
GPMC_CONFIG7_0 = f48, which indicates it’s 16 MB flash but N... Srinivasa Wunnimani

03/06/2020

SW 12:08 PM Software Development: RE: GPIO toggling/chattering while performing NAND read.

Hi,
Test case 1:
Tested on u-boot Version 2013.10 from mitysom (u-boot-mityarm-335x-6c6a700.tar.gz).
Probed GPIO 0_27 while running below command:
nand read.i 0x83000000 0x280000 0x500000
There is some activity on GPIO 0_27 as... Srinivasa Wunnimani

SW 07:25 AM Software Development: GPIO toggling/chattering while performing NAND read.

Hi,
We have mitySOM board in our product and we are using u-boot-mityarm-335x.tar.gz and building u-boot as below:
/* Export path */
source /opt/criticallink/mitysom-335x_2018-04-16/environment-setup-cortexa8hf-neon-criticallink-l... Srinivasa Wunnimani

02/18/2020

JC 02:37 PM Software Development: RE: Reading contents of a file in Uboot

u-boot doesn't really have a lot of file io ability.
You can load a file from sd card, tftp, nfs, or nand into memory. But the only way I know to look at it would be with "md" though that will just print the hex values in memory.
... Jonathan Cormier

MK 11:01 AM Software Development: Reading contents of a file in Uboot

Hi ,
How can i read or cat contents of file from uboot.
Regards,
manjunath Manjunath K S