spi-nor: maxronix MX25L12835F support
p.yadav at ti.com
Tue Feb 16 05:16:05 EST 2021
On 16/02/21 10:48AM, Michael Walle wrote:
> Am 2021-02-16 10:27, schrieb Pratyush Yadav:
> > On 15/02/21 10:53PM, Heiko Thiery wrote:
> > > Hi all,
> > >
> > > I faced an issue with a SPI flash on our board. We use a macronix
> > > MX25L12835F . Unfortunately this flash has the same JEDEC ID like
> > > the MX25L12805D .
> > >
> > > The newer MX25L12835F has support for dual/quad read mode and RDSFDP
> > > while the older doesn't.
> > >
> > > I thought that I could do a fixup with a device specific
> > > post_bfpt_fixups() call but by now this seems not possible. The older
> > > MX25L12805D has no flags set that allows a call to
> > > spi_nor_sfdp_init_params() and implements the fixup.
> > >
> > > Has anyone an idea how to solve this?
> > The post_sfdp fixup is always run regardless of whether the flash has
> > SFDP or not. You can try putting your flash-specific fixups there.
> Well the problem here is, that the SFDP setup is skipped though the
> flash would support SFDP. If the jedec id wasn't already in the table,
> there would be the flag SPI_NOR_QUAD_READ and the SFDP would be
> parsed. But because there is already the legacy device (which likely
> doesn't support SFDP) it really doesn't fit.
Is it possible to differentiate between the two flashes in any way? If
so you can use the init_params() fixup to check that add the flags for
the new flash. Modifying nor->info feels kind of wrong but it is an
acceptable compromise in this situation IMO.
> Its unclear to me, why the SFDP is only parsed if one of the
> SPI_NOR_*_READ flags are set.
I don't know either. Probably to differentiate between legacy flashes
that don't support SFDP at all.
> > >  https://www.macronix.com/Lists/Datasheet/Attachments/7397/MX25L12835F,%203V,%20128Mb,%20v1.6.pdf
> > >  https://www.mxic.com.tw/Lists/Datasheet/Attachments/7321/MX25L12805D,%203V,%20128Mb,%20v1.2.pdf
> > Both these links are broken.
> mh, they work for me.
Ah yes they do. My terminal emulator didn't parse them correctly and
opened something different in the browser.
Texas Instruments Inc.
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