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DMxxx controller and auto XOR key synthesis ?
http://forum.hddguru.com/viewtopic.php?f=27&t=44447		 Page 1 of 1
Author:  Gregory [ July 2nd, 2024, 5:50 ]
Post subject:  DMxxx controller and auto XOR key synthesis ?
Do you plan to add DM XOR key synthesis in the near future? Recently these controllers have started to appear and what is important is that the XOR mechanism is similar to SM32xx, i.e. XOR is modified by BB. You recently created a new XOR "DM_unknown(18336b_384p_xoredSA_ECC)_1775CE.xor" for our case. I have another case with this XOR, but everything goes wrong when it reaches BB - I checked and XOR is also applied to BB.

Is there a chance you will develop an automatic method for this? It can probably be done manually, but it's a lot of work.

Thanks in advance for your answer.

btw. this white horizontal white stripes are data, in DM, XOR before ECC.

ps. on attachment XOR comparison: top after BB cutout, bottom without BB cutout (pink-ECC, green-data area)

Attachments:
DM_XOR_VNR.jpg
DM_XOR_VNR.jpg [ 489.99 KiB | Viewed 22289 times ]
Author:  Sasha Sheremetov [ July 19th, 2024, 16:53 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Can we have some 10-20 blocks from it? Preferably with xor key. I appreciate if you can send a link in ticket.
Author:  Amarbir[CDR-Labs] [ July 29th, 2024, 15:06 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Gregory ,
I have not come across these controllers here in india ,But they are interesting . Anything that we should be aware of other then what you wrote here when we receive a case
Author:  Gregory [ July 30th, 2024, 3:17 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Amarbir[CDR-Labs] wrote:
Gregory ,
I have not come across these controllers here in india ,But they are interesting . Anything that we should be aware of other then what you wrote here when we receive a case

XOR every sector with 1775CE XOR depending on the length of the sector. Sectors leangth may be different when they contain BB, then build new XOR and cut BB ater that.
Author:  Gregory [ July 30th, 2024, 3:40 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Sasha Sheremetov wrote:
Can we have some 10-20 blocks from it? Preferably with xor key. I appreciate if you can send a link in ticket.

Extracted 20 blocks with XOR, Ticket #6834, I created XOR for my case manualy. I am attaching a diagram of how I do it manually, maybe it will make it easier for you to work on developing DM AI XOR.

Attachments:
DMxxx_1775ce_custom.JPG
DMxxx_1775ce_custom.JPG [ 43.83 KiB | Viewed 20806 times ]
Author:  Gregory [ July 31st, 2024, 8:25 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Update my reserch, it looks like this XOR will also be able to start from different pages and also alternate inversions of these pages. I have another case with DMxxx but from now on I will call it DM8381 or DM83xx - I see that Arvika had this controller in a non-monolithic NAND with an XOR signature 8E8464, i.e. this signature is second page of the base XOR 1775CE and is in inversion. I now have another case with 5F29F8 XOR which is located on page 187 of 1775CE XOR and also has every other page in inversion compared to the base XOR.

ps. our new case not have BB but still need manualy created new XOR from 1775CE because have bad read quality and ofc ECC ater XOR :)

ps2. Michał, can you tell us about your experience with the new DM controllers, which would allow us to speed up the work on automatic AI XOR DM in Rusolut?
Author:  Igor_Loskutov [ August 6th, 2024, 11:59 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Hi there,
we've added to the short list AI XOR key generatimg for this controller. Hope it will be done with the next update.
Author:  Sasha Sheremetov [ August 14th, 2024, 9:46 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
We are alpha-testing new AI XOR for DM controllers now.
Gregory, thanks for the idea!
Author:  Igor_Loskutov [ September 5th, 2024, 11:10 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Hi Gregory, have you tried the new AI DM XOR with your cases?
Author:  Gregory [ September 9th, 2024, 6:19 ]
Post subject:  Re: DMxxx controller and auto XOR key synthesis ?
Yes I try once and it working, however, I don't know how it work with bad columns, not tested.
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