Understanding booting issues

[mathew_k_t]

Hi,

I would like to know, how to understand system hang during booting? When I search about it, I found NMI watchdog.

1. Is NMI watchdog is the solution to understand system hang during booting? Please confirm it?
2. How to enable NMI watchdog in imx6ull evk?
3. Is there any other way to understand system error during booting?
4. Once understand the error, I would like to indicate the same. How doing it?

Regards

[igorpadykov]

Hi mathew_k_t

for boot understanding one can follow Boot Chapter of Reference Manual,

check with jtag SRC_SBMR1,2 registers, test signals with oscilloscope and

use guidelines from link

i.MX6Q NAND boot issues 

I do not think that NMI watchdog can shed more light on problem.

Best regards
igor
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[mathew_k_t]

Hi Igor,

Thank you for your response.

I think my question wasn't clear.

When I'm implementing the system as a product, there will not be any access to target console. Then, if the system fails to boot up or continuously restarting, I would like to indicate the user "system failed in Linux boot". So how I can understand the system failure without any access to kernel log.

[igorpadykov]

Hi mathew_k_t

in application, when it successfully boot, you can add led as indicator.

Best regards
igor