On 8 June 2015 at 10:11, Roy Spliet <r.spl...@ultimaker.com> wrote: > Hello Scott et al., > > Op 06-06-15 om 00:02 schreef Scott Wood: > > On Fri, 2015-06-05 at 13:52 +0200, Roy Spliet wrote: > > From: yassin <yassinjaf...@gmail.com> > > Signed-off-by: Roy Spliet <r.spl...@ultimaker.com> > --- > drivers/mtd/nand/Makefile | 2 +- > drivers/mtd/nand/nand_timings.c | 252 > ++++++++++++++++++++++++++++++++++++++++ > include/linux/mtd/nand.h | 3 + > 3 files changed, 256 insertions(+), 1 deletion(-) > create mode 100644 drivers/mtd/nand/nand_timings.c > > This code comes from Linux and yet I see no acknowledgement of that, > much less a statement of which version of Linux this was pulled from. > > Correct, my apologies as I should have clarified that "work by Boris > Brezillon" does not > mean "upsteam work". The code comes from Boris' github tree[1] and contains > work > that was not yet brought upstream, yet is required for NAND on sunxi to > work. > > It would probably be better to handle this as part of a general sync > with the Linux mtd code. > > Ideally yes, but. In upstream Linux MTD we have a few issues to address as > shown > by Boris' patch-set, most importantly: > - NAND chip timings (patch 1 to 3) > - Randomisation support (patch 6) > - Per-partition settings for ECC and randomisation (left out of my RFC, > highly desirable > but not strictly required for U-boot booting)
Hello, as I understand it the ECC and randomisation settings for the bootloader part of the nand are suboptimal or unusable for ubifs so if u-boot SPL is to read the u-boot binary and later u-boot the kernel from an ubifs volume it has to support non-uniform settings. Alternatively the bootloader part can be extended to contain partitions for u-boot binary and kernel image written to raw partition without filesystem much like what Andriod usually does. Thanks Michal _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
