Baruch Siach wrote: > On Mon, Mar 07, 2011 at 10:18:00AM +0100, Juergen Beisert wrote: > > Juergen Beisert wrote: > > > This is revision two of my patch series to make the mini2440 booting > > > from NAND. This seems somehow tricky: The mini2440 with a 64 MiB NAND > > > works fine here, but the one with 128 MiB does currently boot only. > > > In the first patch series where some errors in page address > > > calculation, so they cannot work. This patch series might do it in a > > > correct manner, but now only tested on 64 MiB and 128 MiB NAND. At > > > least booting from NAND is now working also from 128 MiB. But the ECC > > > handling fails, and I have no idea whats wrong now: Reading the > > > environment fails with 'err: -74'... > > > > Here the main question: > > - what is the difference in ECC handling in the S3C2440 CPU when using > > a "small page" or a "large page" NAND? > > "Small page" ECC seems to work, but "large page" ECC fails. Anyone here > > with more experience with S3C2440/NAND? The Linux driver works well on > > the large page NANDs, but not the barebox's one. > > I don't have experience with the S3C2440 NAND controller, but I'm working > on a similar problem in the i.MX NAND controller Linux driver. NAND chips > with 2k page size work fine, but 4k devices fail in the kernel. The cause > for this is the wrong nand_ecclayout. In the i.MX case, the .eccpos table > was too small for the larger ECC table of the 4k devices. This caused a > corruption of the OOB data at the higher level of the NAND stack. Fixing > this requires upgrade to a newer kernel (I currently use 2.6.36). > > As the nand_s3c2410 Barebox driver (like the kernel one) has only one > nand_ecclayout struct for the 512 bytes page size, this may be the cause of > your problem. > > I hope this helps. \o/ The S3C2440 is using a 4 bytes ECC for 2048 sized page NANDs. After changing it, barebox is now able to write and read the environment. Thanks, jbe -- Pengutronix e.K. | Juergen Beisert | Linux Solutions for Science and Industry | Phone: +49-8766-939 228 | Vertretung Sued/Muenchen, Germany | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de/ | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
