How common is OTP support in NAND flash?
I see that MTD char drivers have support for programming the OTP pages on NAND flash, some questions regarding that.
Do most flash chip vendors support on-flash OTP pages or if one develops product that depends on using data from flash OTP, one would be locked into that specific vendors.
And does anybody know if these OTP pages are also subjected to bit-flipping or one shouldn't have to worry about that for OTP pages?
-Subodh
Quoted 9 lines · Subodh Nijsure
I see that MTD char drivers have support for programming the OTP pages on NAND flash, some questions regarding that.
Do most flash chip vendors support on-flash OTP pages or if one develops product that depends on using data from flash OTP, one would be locked into that specific vendors.
And does anybody know if these OTP pages are also subjected to bit-flipping or one shouldn't have to worry about that for OTP pages?
I think this OTP stuff is ad-hoc and was not designed carefully. I cannot tell for sure, but most probably this is very vendor/HW - specific.
Signature · 2 lines
Best Regards, Artem Bityutskiy
Quoted 11 lines · Subodh Nijsure
Quoted 9 lines
I see that MTD char drivers have support for programming the OTP pages on NAND flash, some questions regarding that.
Do most flash chip vendors support on-flash OTP pages or if one develops product that depends on using data from flash OTP, one would be locked into that specific vendors.
And does anybody know if these OTP pages are also subjected to bit-flipping or one shouldn't have to worry about that for OTP pages?
I actually can't say I know, but since it is OTP, it's not possible to erase and reprogram the data; and it's intended use for more or less permanent information would strongly suggest that it must be an array of classic EPROM cells with essentially no bit rot or it wouldn't be very useful.
/Ricard
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Ricard Wolf Wanderlöf ricardw(at)axis.com Axis Communications AB, Lund, Sweden www.axis.com Phone +46 46 272 2016 Fax +46 46 13 61 30