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SubjectRe: [PATCH 13/15] MTD: add few workarounds to nand system for SmartMedia/xD chips.
On Mon, 22 Feb 2010, Maxim Levitsky wrote:

> On Mon, 2010-02-22 at 22:25 +0100, Thomas Gleixner wrote:
> > On Mon, 22 Feb 2010, Maxim Levitsky wrote:
> >
> > > * Add an option NAND_SMARTMEDIA that can be set by nand driver
> > > If set, it will cause separate ID table to be used, which includes
> > > mask rom devices and new xD cards
> >
> > Why that option ? We can just extend the existing ids table and be
> > done. No extra magic needed.
> >
>
> Two reasons.
>
> First of all several xD chips (I belive the Type M) have exactly same
> IDs like normal nand chips. However they don't report capabilities about
> pagesize, blocksize, etc.

You mean that crap ?

+ /* xD only */
+ {"xD 512MiB 3,3V", 0xDC, 512, 512, 0x4000, XD_TYPEM},
+ {"xD 1GiB 3,3V", 0xD3, 512, 1024, 0x4000, XD_TYPEM},
+ {"xD 2GiB 3,3V", 0xD5, 512, 2048, 0x4000, XD_TYPEM},
Oh well, that's a perfect example of designed by comittee shit.

They abuse the 2k chips IDs and define crappy sizes just to fit the
stupid spec.

> I am confident that these cards have an internal FTL and controller, and
> just 'emulate' that nand interface.

Either that or the adapter translates the 512B commands to 2K
commands. I bet on the latter. AFAIK are xD cards just as stupid as
SmartMedia ones, i.e. bare NAND chips in a flat plastic housing with
gold contacts.

> Also, my card reports write protect, although, xD cards don't have any
> 'switch' to make them protected.

Neither have SmartMedia Cards nor bare NAND chips. WP is a pin on the
interface which is controlled by the adapter hardware.

> Even if there were readonly ROM xD cards (the odds of this are virtually
> zero), these won't just expose this in WP bit.

Hmm, I wonder whether that horror has the WP bit inverted.

Thanks,

tglx


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