Problem in Reading NAND flash in AM335x evm board

vivek patil47

Prodigy 215 points

Hi,

I am using EVM board for testing NAND flash.

I do have following issue.

When I read NAND page I got the following Error : NAND_STATUS_READ_ECC_UNCORRECTABLE_ERROR.

I have commented NANDWrite() and NANDErase APIs.

I wanted to know what will be the values in flash when I read blank NAND flash page.

As per my understanding it should be 0xff (2048 times, as page size) and read should be successful.

But instead of getting success I got the above error.

Please let me know what exactly the problem is. is my above understanding is correct or not?

over 8 years ago

0 Karthick Kumaran A S V over 8 years ago

Intellectual 875 points

You are right about the contents but did you check that you set the correct ECC algo?

0 Dwarakesh Radhakrishnan over 8 years ago

Guru 13660 points

Hi Vivek,

Since you have not written using NAND write, I believe there wont be any ECC written in your OOB. So I would suggest you to disable ECC and do the NAND read operation.

0 vivek patil47 over 8 years ago in reply to Karthick Kumaran A S V

Prodigy 215 points

Thanks to clear my understanding. I have used NAND_ECC_ALGO_BCH_8BIT ECC algo.

0 vivek patil47 over 8 years ago in reply to Dwarakesh Radhakrishnan

Prodigy 215 points

Thanks for the reply.
NAND Read operation worked very well after disabling the ECC.
But I have to use ECC algo. in my application. so how should I solve this issue.

0 Dwarakesh Radhakrishnan over 8 years ago in reply to vivek patil47

Guru 13660 points

Hi Vivek,

Do you need to READ after ERASE, without WRITE ?

0 Dwarakesh Radhakrishnan over 8 years ago in reply to Dwarakesh Radhakrishnan

Guru 13660 points

Hi Vivek,

Try erasing, before accessing and check if it is working.

0 Lalindra Jayatilleke over 8 years ago in reply to vivek patil47

TI__Mastermind 30365 points

Vivek,

Did you try what Dwarakesh mentioned above by?

"Try erasing, before accessing and check if it is working."

Lali

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Problem in Reading NAND flash in AM335x evm board