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    SubjectRe: [PATCH v2 0/3] mtd: Make sure UBIFS does not do multi-pass page programming on flashes that don't support it
    On Tue, Nov 24, 2020 at 2:58 PM Pratyush Yadav <p.yadav@ti.com> wrote:
    >
    > Hi,
    >
    > On 18/11/20 11:54PM, Pratyush Yadav wrote:
    > > Hi,
    > >
    > > The Cypress Semper S28 flash family uses 2-bit ECC by default. Under
    > > this ECC scheme, multi-pass page programs result in a program error.
    > > This means that unlike many other SPI NOR flashes, bit-walking cannot be
    > > done. In other words, once a page is programmed, its bits cannot then be
    > > flipped to 0 without an erase in between.
    > >
    > > This causes problems with UBIFS because it uses bit-walking to clear EC
    > > and VID magic numbers from a PEB before issuing an erase to preserve the
    > > file system correctness in case of power cuts.
    > >
    > > This series fixes that by setting mtd->writesize to the ECC block size
    > > (16) and making sure UBIFS does not try to do a multi-pass write on
    > > flashes with writesize > 1.
    > >
    > > It is based on the xSPI/8D series that adds support for Cypress S28
    > > flash [0] (it is in next now). The patches themselves are independent of
    > > that series in the sense that they don't rely on 8D support. But since
    > > S28 flash is not supported without that series, these patches don't make
    > > much sense without it.
    > >
    > > Tested on Cypress S28HS512T and MT35XU512ABA on J7200 and J721E
    > > respectively.
    > >
    > > [0] https://lore.kernel.org/linux-mtd/20201005153138.6437-1-p.yadav@ti.com/
    >
    > Any comments on the series? If not, can it be picked up?
    >
    > > Pratyush Yadav (3):
    > > UBI: Do not zero out EC and VID on ECC-ed NOR flashes
    > > mtd: spi-nor: core: Allow flashes to specify MTD writesize
    > > mtd: spi-nor: spansion: Set ECC block size
    > >
    > > drivers/mtd/spi-nor/core.c | 4 +++-
    > > drivers/mtd/spi-nor/core.h | 3 +++
    > > drivers/mtd/spi-nor/spansion.c | 1 +
    > > drivers/mtd/ubi/build.c | 4 +---
    > > drivers/mtd/ubi/io.c | 9 ++++++++-
    > > 5 files changed, 16 insertions(+), 5 deletions(-)

    Can we please have am ACK from NOR folks? :-)

    --
    Thanks,
    //richard

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