[U-Boot] [PATCH v3 3/3] spi-nor: spi-nor-ids: Add USE_FSR flag for mt25q* and n25q* entry

[Jagan Teki]

On Wed, Oct 23, 2019 at 10:49 AM Vignesh Raghavendra <vigneshr at ti.com> wrote:
>
> Hi Jagan,
>
> On 23/10/19 12:00 AM, Jagan Teki wrote:
> > Hi Vignesh,
> >
> > On Fri, Oct 11, 2019 at 1:28 PM Vignesh Raghavendra <vigneshr at ti.com> wrote:
> >>
> >> n25q* and mt25q* (both 256Mb and 512Mb) flashes support Flag status
> >> register that indicates various errors that may be encountered during
> >> erase/write operations. Therefore add USE_FSR flag wherever missing.
> >
> > Does 256Mb require FSR? I remember Micron die is created after 512Mb
> > where it creates die between two 256Mb on 512Mb flash. Indeed die
> > switching would require FSR.
> >
>
> Flag Status Register(FSR) is not for switching die but for looking up and
> printing out reason for write/erase failure. And yes 256Mb part does
> support FSR. See datasheet at:
> https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_1_8v.pdf
> Table 17: Flag Status Register Bit Definition
>
> https://www.mouser.com/datasheet/2/671/MT25Q_QLJS_U_256_ABA_0-1387271.pdf
> Table 5: Flag Status Register

Yes, I have seen these. I remember it wasn't require FSR when I did a
test on zynq qspi last time. may be it can't consistent between all
IP's