> -----Original Message----- > From: u-boot-boun...@lists.denx.de [mailto:u-boot-boun...@lists.denx.de] On > Behalf Of Peter Barada > Sent: Thursday, September 19, 2013 3:26 PM > To: u-boot@lists.denx.de; Peter Barada > Subject: Re: [U-Boot] NAND flash question > > On 09/19/2013 04:04 PM, ANDY KENNEDY wrote: > > All, > > > > We have a design that has NAND as a secondary device (not the boot > > device). The last four pages of the NAND flash are reported as bad. > > Should this be true for all NAND flash devices we have? > > > > > No, I wouldn't think so. Manufacturers qualify their parts and mark bad > blocks found during qualification testing. Most data sheets indicate > that the number of bad blocks marked bad during manufacturer is below a > set percentage(if above thent he part is rejected). Some parts that are > meant to be used during boot (such as NAND meant for OMAP parts) will > have certain blocks that are guaranteed good (i.e. the boot blocks). > Past that bad blocks could be anywhere in a particular device. >
Okay, well, next question: So on EVERY unit we have designed with a NAND flash, when u-Boot reads the NAND flash it reports that it couldn't locate a bad block table and states that it cannot read the last four pages of the flash. Next, when one does a 'nand bad' on these boards, these last four pages are reported by u-Boot as bad. Looking at the code, we believe that this is by design. Is that correct? Has anyone else done a 'nand bad' on a board and seen the same information? Thanks again for any information you can provide, Andy _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
