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Bolo
Joined: 05 Dec 2017
Posts: 727
Location: 506F6C616E64
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 Posted: 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.
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Bolo
Joined: 05 Dec 2017
Posts: 727
Location: 506F6C616E64
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Posted: Tue Dec 08, 2020 15:11 Post subject:
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HaQue
Joined: 16 Feb 2013
Posts: 473
Location: Adelaide, Australia
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Posted: 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.
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Bolo
Joined: 05 Dec 2017
Posts: 727
Location: 506F6C616E64
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Posted: 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
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Сергей
Joined: 26 Aug 2005
Posts: 20282
Flash-Extractor developer
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Posted: 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
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jeremyb
Joined: 09 Dec 2008
Posts: 1950
Location: RecoverMyFlashDrive.com Bridgeport, CT, USA
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Posted: 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?
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Сергей
Joined: 26 Aug 2005
Posts: 20282
Flash-Extractor developer
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Posted: 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
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Bolo
Joined: 05 Dec 2017
Posts: 727
Location: 506F6C616E64
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Posted: 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
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arvika
Joined: 18 Nov 2009
Posts: 2586
Location: Poland
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Posted: Wed Jan 13, 2021 15:27 Post subject:
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Is it possible implement this option to FE?
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Сергей
Joined: 26 Aug 2005
Posts: 20282
Flash-Extractor developer
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Posted: 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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