[PATCH] mtd: m25p80: Micron SPI uses Macronix-style 4-byte addressing

[Vivien Didelot]

Hi Brian,

----- Mail original -----
> De: "Brian Norris" <computersforpeace at gmail.com>
> À: "Marek Vasut" <marex at denx.de>
> Cc: linux-mtd at lists.infradead.org, stable at vger.kernel.org, "Vivien Didelot" <vivien.didelot at savoirfairelinux.com>
> Envoyé: Dimanche 11 Août 2013 22:44:31
> Objet: Re: [PATCH] mtd: m25p80: Micron SPI uses Macronix-style 4-byte addressing
> 
> On Fri, Aug 9, 2013 at 11:46 AM, Marek Vasut <marex at denx.de> wrote:
> > Dear Brian Norris,
> >
> >> For SPI NOR flash that are larger than 128Mbit (16MiB), we need 4
> >> bytes
> >> of address space to reach the entire flash; however, the original
> >> SPI
> >> flash protocol used only 3 bytes for the address. So far, the
> >> practice
> >> for handling this has been either to use new command opcodes that
> >> are
> >> defined to use 4 bytes for their address, or to use special
> >> mode-switching command to configure all
> >> traditionally-3-byte-address
> >> commands to take 4 bytes instead.
> 
> [snip long description of a mess]
> 
> > The situation with the 4b addressing is a horrible mess :(
> 
> Agreed. It took me a while to figure out that this was the root of my
> problems last week.
> 
> > Acked-by: Marek Vasut <marex at denx.de>
> 
> Thanks.
> 
> Brian
> 

I'm just adding kernel at savoirfairelinux.com in the loop.

Thanks,
Vivien.