[PATCH v4 6/8] mtd: spi-nor: Add a RWW flag

Tudor Ambarus tudor.ambarus at linaro.org
Thu Mar 16 20:20:21 PDT 2023

Hi, Miquel!

On 2/1/23 11:36, Miquel Raynal wrote:
> Introduce a new (no SFDP) flag for the feature that we are about to
> support: Read While Write. This means, if the chip has several banks and
> supports RWW, once a page of data to write has been transferred into the
> chip's internal SRAM, another read operation happening on a different
> bank can be performed during the tPROG delay.
> Adding this new flag involves enlarging the no_sfdp_flags variable to 16
> bits.

I've just skimmed over jesd216 - f version, and indeed it seems that
reads while write support is not covered by the standard. no_sfdp_flags
is not a good place to add this flag, because there can be flashes that
both support SFDP and RWW support. Please move this flag in info->flags.

BTW, does you flash define SFDP table(s)? You can dump the tables via
sysfs, here's an example:


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