[PATCH v1 0/2] Add octal DTR support for Macronix flash

[liao jaime]

Hi Tudor


>
>
>
> On 7/25/23 09:28, Michael Walle wrote:
> > Am 2023-07-25 10:01, schrieb Tudor Ambarus:
> >> On 7/25/23 03:23, Jaime Liao wrote:
> >>> From: JaimeLiao <jaimeliao.tw at gmail.com>
> >>>
> >>> This series add method for Macronix Octal DTR Eable/Disable
> >>> and add Macronix Octal flash support.
> >>
> >> Do all these flashes swap the bytes in octal DTR mode? If yes,
> >> you should add the infrastructure so that controllers can swap
> >> the bytes back, otherwise you'll break bootloaders which work
> >> in 1-1-1 mode, and breaking the boot chain is unacceptable.
No, only parts of flashes.
MX25UM51345G : flash without swap bytes in octal dtr mode
MX25UM51245G : flash will swap bytes in octal dtr mode
So that I hope flashes without swap the bytes can be support.
And I will send new patch for mention flashes which swap the bytes
in Octal DTR mode.

> >
> > It might also be the SPI controller. Was the zynq SPI controller
> > used before with octal flashes?
> >
>
> No, it's the macronix flashes that swap the bytes by default. At least
> the one which I've worked with few years ago. Some controllers can
> swap the bytes back, but they have to be informed from mtd.
Yes, it should inform mtd.



Thanks
Jaime