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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 25th, 2024, 8:33 
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Joined: September 23rd, 2019, 2:55
Posts: 112
Location: Poland
Feedback about VNR 8.2 and SM XOR mod by BB:

It looks like it works :) but there is one problem - determining the structure in which BBs occur, i.e. the automatic key options XOR structure does not work because we cannot determine different lengths of "as Data area" for sectors.

This has to be done manually :(

There are several ways to fix this - you could allow different sector lengths to be specified for "set as Data area" or, to avoid damaging the integrity of the VNR software, add a new "set as XOR Data area" option with different sector lengths.

Anyway, this new features is good improvment. :good:


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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 26th, 2024, 5:37 
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Joined: July 2nd, 2014, 8:05
Posts: 215
Gregory wrote:
there is one problem - determining the structure in which BBs occur, i.e. the automatic key options XOR structure does not work because we cannot determine different lengths of "as Data area" for sectors.

This has to be done manually :(


Thanks a lot for a very useful feedback!
I'll show this to my teammates and we brainstorm how/if to improve this.

_________________
VISUAL NAND RECONSTRUCTOR. Since 2014.


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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 27th, 2024, 12:31 
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Joined: August 26th, 2013, 3:50
Posts: 26
Location: Poland
I'm not quite sure if I understood correctly, but it seems you use it not right. There will be a webinar next week, we'll show how it works.
In short, you do not need to define any custom structure here. You firstly remove bad columns with BCR, structure has not to be defined there. Then, after bad columns are removed, you set the normal correct structure. And later you connect the AI SM XOR. The XOR will be generated taking into account bad columns specified one step before.


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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 27th, 2024, 14:48 
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Joined: September 23rd, 2019, 2:55
Posts: 112
Location: Poland
Igor_Loskutov wrote:
In short, you do not need to define any custom structure here. You firstly remove bad columns with BCR, structure has not to be defined there. Then, after bad columns are removed, you set the normal correct structure. And later you connect the AI SM XOR.

You write differently on the Rusolut website "The AI SM XOR generator can now automatically generate XOR key onto the bad columns, when connected before Bad Column Remover (BCR) element." ??

I think I did that too after BCR, but I don't remember whether the XOR was bad then or whether it was generating very slowly. My method generated the correct XOR and did it lightning fast, and case was sucesfully done. I'll check tomorrow and let you know.


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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 28th, 2024, 3:53 
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Joined: September 23rd, 2019, 2:55
Posts: 112
Location: Poland
Igor_Loskutov wrote:
In short, you do not need to define any custom structure here. You firstly remove bad columns with BCR, structure has not to be defined there. Then, after bad columns are removed, you set the normal correct structure. And later you connect the AI SM XOR. The XOR will be generated taking into account bad columns specified one step before.

OK, it also works, so you have the wrong description on the website I suggested.


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 Post subject: Re: Question about Silicon Motion XOR modified by Bad bytes?
PostPosted: June 28th, 2024, 6:07 
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Joined: August 26th, 2013, 3:50
Posts: 26
Location: Poland
Gregory wrote:
Igor_Loskutov wrote:
In short, you do not need to define any custom structure here. You firstly remove bad columns with BCR, structure has not to be defined there. Then, after bad columns are removed, you set the normal correct structure. And later you connect the AI SM XOR. The XOR will be generated taking into account bad columns specified one step before.

OK, it also works, so you have the wrong description on the website I suggested.


ooops :oops:
This is what happens when a person writes description in the last day before vacation :lol: Thank you for the input, it is fixed.


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