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Bolo



Joined: 05 Dec 2017
Posts: 386
Location: 506F6C616E64

PostPosted: Tue Dec 08, 2020 15:09    Post subject: ECC BackWrite not compatible - Solution for RAW Recovery
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Hello,

Please find below instruction how you can implement small option as "Mark Errors which choosen byte" to help solve issue with ECC back write issue.

I think that illustration can bring more informations.
Bolo



Joined: 05 Dec 2017
Posts: 386
Location: 506F6C616E64

PostPosted: Tue Dec 08, 2020 15:11    Post subject:
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........
ECC_backwrite_RAW_POC.jpg
HaQue



Joined: 16 Feb 2013
Posts: 466
Location: Adelaide, Australia

PostPosted: Tue Dec 08, 2020 18:10    Post subject:
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wouldn't it be better to have a tool that will reread a chip at each sector with bad ecc, using different RR values? like pass 1, chip is read. Pass 2 find 1st badd ecc sector, reread until good ecc, go to next bad sector... have a timeout or retry x many times value.
Bolo



Joined: 05 Dec 2017
Posts: 386
Location: 506F6C616E64

PostPosted: Tue Dec 08, 2020 18:25    Post subject:
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No - ECC is calculated here in diffrent way so it's not possible with FE. Only solution is mark bad data with known pattern which repeats and which we can then replace with correct one using script
Сергей



Joined: 26 Aug 2005
Posts: 18299

Flash-Extractor developer

PostPosted: Sun Dec 20, 2020 14:07    Post subject:
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New button added on ECC map in FE_970

Can save map to file
jeremyb



Joined: 09 Dec 2008
Posts: 1627
Location: RecoverMyFlashDrive.com Bridgeport, CT, USA

PostPosted: Mon Dec 21, 2020 17:41    Post subject:
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Сергей wrote:
New button added on ECC map in FE_970

Can save map to file

How is new Calc Statistics button useful? Is there an ECC retry script I don't know about?
Сергей



Joined: 26 Aug 2005
Posts: 18299

Flash-Extractor developer

PostPosted: Mon Dec 21, 2020 23:57    Post subject:
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I think it will not work

Because image is unxored, while dump is xored

With this layouts we can not save original xored dump with ECC = ON
Bolo



Joined: 05 Dec 2017
Posts: 386
Location: 506F6C616E64

PostPosted: Wed Jan 13, 2021 15:17    Post subject:
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Options works great - we just assembled one image based on H9TP32A4GDD 32_1122 Xor 4983 where ECC back write was not possible
arvika



Joined: 18 Nov 2009
Posts: 1907
Location: Poland

PostPosted: Wed Jan 13, 2021 15:27    Post subject:
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Is it possible implement this option to FE?
Сергей



Joined: 26 Aug 2005
Posts: 18299

Flash-Extractor developer

PostPosted: Thu Jan 21, 2021 12:00    Post subject:
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The only way to save dump with ECC = ON is use Assembler = Raw
(for this layouts)

But then you lost all SA information

At this point you can use Raw Recovery

Or you need somehow extract SA info from FE
May be Bolo use BN / SN logs
May be he get info from other software

Anyway at this point you need write your own BN / SN assembler

I can not make export of SA, and make image processing same way as FE make with dumps
Because this is very large job

Ask me time to time when you have such case
May be i find way to make ECC Fix work
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