On Thu, 2022-06-16 at 00:18:34 UTC, Christian Marangi wrote: > IPQ8064 nand have special pages where a different layout scheme is used. > These special page are used by boot partition and on reading them > lots of warning are reported about wrong ECC data and if written to > results in broken data and not bootable device. > > The layout scheme used by these special page consist in using 512 bytes > as the codeword size (even for the last codeword) while writing to CFG0 > register. This forces the NAND controller to unprotect the 4 bytes of > spare data. > > Since the kernel is unaware of this different layout for these special > page, it does try to protect the spare data too during read/write and > warn about CRC errors. > > Add support for this by permitting the user to declare these special > pages in dts by declaring offset and size of the partition. The driver > internally will convert these value to nand pages. > > On user read/write the page is checked and if it's a boot page the > correct layout is used. > > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx> > Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx> Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks. Miquel
