Harald Welte wrote: > On Mon, Jul 07, 2008 at 01:47:24PM -0500, Scott Wood wrote: >> It works if you allow room for bad blocks within each partition, and treat >> the environment as its own partition. Current u-boot supports skipping bad >> blocks within a desginated environment region. > > which wastes a lot of space, if you have something like a 128kByte > erase-block-size (like most 2kByte page size NAND's today)... so if you > want to have redundancy and use some spare blocks you will end up with > something on the order of 512kByte of wasted flash space to store a > couple of hundreds of bytes environment. Not very elegant. > > Furthermore, if you want to make sure it always works with any of your > components that are within the spec of the manufacturer, then you will > waste even more. The problem is that a new virgin component e.g. a > 64MByte flash from Samsung can have already as many as 1.3MBytes of bad > blocks.
Fair enough... > Therefore, I still believe that such a feature is useful and should be > merged into u-boot. If there are problems with my particular > implementation, I'm happy to address them. Can you base it off of the testing branch of the u-boot-nand-flash repo? > I also have another patchset for what I call 'dynpart' support, i.e. the > dynamic calculation of a unit-specific partition table that ensures the > net size of partitions are as per spec, no matter how many of the > factory default blocks are located where. So it would even support > NAND devices with a worse spec than the ones that we were using. Interesting... Would such a patch eliminate the need for this one, by making the environment a dynamic partition? Is there any (plan for) Linux support? -Scott ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
