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Nand Remaping Reply  
handsome
markoco
 Does anyone know of a good program to identify bad blocks and　remap
a 1 gig nand image
there does not seem to be any support here from wellon
[ The message is modified by markoco ]
Go back list [ Posted:2014-11-17 11:05:43 ] Edit Administer top

Re:Nand Remaping Reply  
handsome
lxl
 This software needs to be customized,Each user definition is not the same
Go back list [ Posted:2014-11-17 13:49:56 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 Can you customize this software what would you need from the user ?
Go back list [ Posted:2014-11-19 05:13:04 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 how is the invalid block(s) status defined?
how to　create the　invalid block table?
wellon make the invalid block(s) status by the 1st byte in the spare area, by non-FFh data
Go back list [ Posted:2014-11-19 12:56:26 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 No erase operation is allowed to detected bad blocks
Regarding invalid blocks, bad block mark is in whole pages.
Please read one column of any page in each block. If the data of the column is 00 (Hex), define the block as a bad
block.
When an error happens in Block A, try to reprogram the
data into another Block (Block B) by loading from an
external buffer. Then, prevent further system accesses
to Block A ( by creating a bad block table or by using
another appropriate scheme).
Go back list [ Posted:2014-11-19 15:48:41 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 can you make the specialized software to unmapp the data identify the bad blocks and remap the data ?
Go back list [ Posted:2014-11-19 15:51:42 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 we only customize this software that use offer Scheme.
not unmapp.
Go back list [ Posted:2014-11-20 09:00:33 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 Please explain i don"t understand what use offer scheme　is and how it
relates to identifying bad blocks
Go back list [ Posted:2014-11-20 15:23:25 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 sorry,it is "user offer scheme"
we only customize this software for Product Designers. if you are Designer, you can offer scheme about identifying bad blocks
Go back list [ Posted:2014-11-21 13:35:52 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 I would be interested in getting this software so we can identify the data in the bad blocks so we can remap it later on
Go back list [ Posted:2014-11-21 15:41:18 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 sorry,Methods every designer definitions are not the same
Go back list [ Posted:2014-11-21 21:02:24 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 Please Explain how a designer would show you how to find bad blocks　i
don"t understand
Xeltek offers this function in there software why cant you ?
[ The message is modified by markoco ]
Go back list [ Posted:2014-11-22 03:31:35 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
bloto21
 I think that user mean function like　"mark bad sector"
For example:

http://www.stlinux.com/howto/NAND/clean
They use nand scrub to mark all marked bad sectors as good one.

To discover which sector is good and which one is bad is simple, just try write something and if you get error that sector should be marked as bad sector.
Thats how it works.
Go back list [ Posted:2014-11-23 08:24:53 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
bloto21
 Function is interesting, but should be created table of all marked as bad sectors.

Like on sti website they use nand bad to display all the bad sectors.
Now you can use nand scrub to erase them all.
Fill up nand with random data to detect which sectors cannot be writen.


Make a list of not possible to write bad blocks.
From script mark all bad sectors. Sti uboot use mark bad command.
Go back list [ Posted:2014-11-23 08:25:53 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 The default selection wellon programmer is jump bad block
wellon make the invalid block(s) status by the 1st byte in the spare area, by non-FFh data
Go back list [ Posted:2014-11-23 09:23:06 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
markoco
 is it safe to use the erase in the wellon software　does it attempt to
erase any blocks that are currently marked bad.?
Go back list [ Posted:2014-11-24 11:42:31 ] Edit Administer Top

Re:Nand Remaping Reply  
handsome
lxl
 wellon software will erase all block,
when program,if any block program fail,this block is marked bad block.
Go back list [ Posted:2014-11-24 15:07:16 ] Edit Administer Top
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