Gaer, A. wrote: > Hi! > > It seems like the layout of OOB/4-Bit-ECC data in NAND flash differs > from RBL/UBL to u-boot/linux (at least on a DM365 device). Is there > any good reason for this?
Hi, just to say I am working in similar areas (trying to understand what the hell TI are doing with their NAND ECC layouts), on DM355 so far but may start looking at DM365 before long. So I am interested in whatever progress you make. The DM355 silicon errata admits that the DM355 RBL doesn't actually check 4-bit ECC at all. But the layout used by UBL, u-boot and linux is all messed up. There is some stuff about DM365 RBL ECC handling in the DM365 silicon errata too, not the same thing, but maybe of interest. > As far as I understand, the RBL/UBL uses this layout (2048 byte > pages): What is your understanding based on? What wrote that format? Are you reading that from flash or working it out by inspecting code? > The different layout means that it is impossible to update UBL/u-boot > from u-boot or linux. Have you tried? On DM355 at least, it seems this would actually work. > Another question: 512 byte pages in linux seem to have a really funny > oob layout > > EEEEEXEE > XXXXXEEE > > Does anybody know the reason for that? (I know the 6th byte is the > manufacturer bad-block marker. But why not just put the ECC data into > the last 10 byte of oob like RBL/UBL do it?) Good luck getting good answers to these questions. This might be worth some wiki documenting when it becomes clearer. -- Jon Povey [email protected] Racelogic is a limited company registered in England. Registered number 2743719 . Registered Office Unit 10, Swan Business Centre, Osier Way, Buckingham, Bucks, MK18 1TB . The information contained in this electronic mail transmission is intended by Racelogic Ltd for the use of the named individual or entity to which it is directed and may contain information that is confidential or privileged. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email so that the sender's address records can be corrected. The views expressed by the sender of this communication do not necessarily represent those of Racelogic Ltd. Please note that Racelogic reserves the right to monitor e-mail communications passing through its network _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
