Re: sddr09.c

[Matthew Dharm]

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Andries --

I have docs on this thing.  It's been an on-again, off-again project with
some other developers.  You're the first to be able to write to the thing.

The translation is designed to preserve integrity -- i.e. you write the
data, then atomically set one block invalid and another valid.  There's
actually a command for this at the controller-level.

I suggest that, if you're serious about finishing this, you get on board
the usb-storage devel team (contact me off-lists about this), so we can get
you access to the specs and then get this thing working.

Matt

On Mon, Apr 08, 2002 at 11:10:43PM +0000, [e-mail] wrote:
> This evening I cleaned up sddr09.c, and after some playing
> succeeded in writing to a SM card.
> Remains the question: does anyone have docs for this thing?
>=20
> (The "read control" command gives 64 bytes for each 16kB block.
> The last 48 look like junk. The first 16 either are all zero,
> or start with six FF bytes followed by two groups of five bytes.
> The first two bytes of both groups of five are equal, and
> describe the PBA <-> LBA correspondence.
> I do not know what the final three bytes of both groups mean.
> They have five nybbles of even parity and one nybble that ends
> in two 1 bits.
> What is the purpose of this PBA <-> LBA mapping?
> To avoid bad blocks? Or is rewriting a sector much slower
> than relocating it and writing a fresh one?
> I invented a "write_data" command, but have not yet tried
> to do a "write_control".)
>=20
> Andries
> -
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--=20
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.=
net=20
Maintainer, Linux USB Mass Storage Driver

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