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 Post subject: Function for periodically occurring bad bits in FC2279 -Idea
PostPosted: August 5th, 2024, 8:46 
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Joined: September 23rd, 2019, 2:55
Posts: 112
Location: Poland
Hello, have you had any experience with periodically occurring bad bits in a damaged plane? We have a new case based on the FC2279 controller, the problem is that the block has 1536 bad bits, cutting them out manually is time-consuming and it could be done with one mouse click after entering 2 parameters in VNR - the location of the first bad bit and the period of occurrence.

Below you will find an example in the screenshot I have attached: in our case, the first bad bit column is in position 13, the next ones are 109, 205, 301... etc. so the period is 96 bits.

I think it's nice that a function has been implemented in VNR that will do it for us automatically.
Is it possible to develop such a function in VNR?

ps. after removing these bad bits, I have ECC and I can see the data, so it is not a garbage block.

Best regards.


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FC2279_bad_bit_period.jpg
FC2279_bad_bit_period.jpg [ 576.45 KiB | Viewed 10350 times ]
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 Post subject: Re: Function for periodically occurring bad bits in FC2279 -
PostPosted: August 6th, 2024, 12:22 
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Joined: August 26th, 2013, 3:50
Posts: 26
Location: Poland
That is impressive that you removed 1536 bad bits manually :shock:
I think if we meet more such cases, we'll do it.


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 Post subject: Re: Function for periodically occurring bad bits in FC2279 -
PostPosted: August 9th, 2025, 3:57 
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Joined: March 8th, 2009, 22:44
Posts: 43
Location: the E.U.
I have one such case, too.

But my current problem is that I cannot get bBCR to work in VNR 9. No matter how many or which bits I remove, the dump stays 100% identical. BCR working fine.

:?


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 Post subject: Re: Function for periodically occurring bad bits in FC2279 -
PostPosted: August 9th, 2025, 5:33 
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Joined: October 24th, 2009, 15:22
Posts: 917
Location: Poland
bBCR was change methodology at this version as I remember. Ask support, as I remember there was some video or article.

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Flash Killer - everyday new resources (pinout, XOR, ECC,config) for flash devices


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 Post subject: Re: Function for periodically occurring bad bits in FC2279 -
PostPosted: August 10th, 2025, 12:43 
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Joined: October 3rd, 2005, 0:40
Posts: 4753
Location: Hungary
i think you could write a script to generate the textual description of the bad bits and load it into vnr. Probably you need to copy it into the task xml.

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