Patching only NAND specific stuff possible?

Patching only NAND specific stuff possible?

[Marcus Mikolaiczyk]

So again me with my SAMSUNG NAND.
Is it a possibility to patch only the NAND related stuff
driver/mtd/nand/*
include/linux/mtd/nand*
??*
to support new NAND features...
Considering the four Layers (jffs2,mtd,nand,hardware-drivers) it should
be possible onloy to 'update' the nand and hardware-drivers stuff.
Any objections to this?

A secondary short question, if you don't mind.
Where takes the 'addressing' of the NAND takes place (write Col,Row to ALE)?

On the Samsung K9F2G08... there are 5 Cycles for the address resolution
nescessary. And two for the command. Example Read page..
Command=0x00
Address=Col_addr(BIT 0-7)
Address=Col_addr(BIT 8-11)
Address=Row_addr(BIT 0-7)
Address=Row_addr(BIT 8-15)
Address=Row_addr(BIT 16)
CLE=0x30
Then read Data...
I saw some NAND chips which only have 4 Address Cycles.

Kind Regards Marcus

Re: Patching only NAND specific stuff possible?

[Thomas Gleixner]

On Wed, 2005-05-11 at 10:25 +0200, Marcus Mikolaiczyk wrote:
> Considering the four Layers (jffs2,mtd,nand,hardware-drivers) it should
> be possible onloy to 'update' the nand and hardware-drivers stuff.
> Any objections to this?

No, as long as you do not ask questions, why it doesnt work. :)
The current nand driver needs the current mtd layer and JFFS2 from the
last century will not work with those.

> A secondary short question, if you don't mind.
> Where takes the 'addressing' of the NAND takes place (write Col,Row to ALE)?

nand_command(_lp) depending on the device type.

> On the Samsung K9F2G08... there are 5 Cycles for the address resolution
> I saw some NAND chips which only have 4 Address Cycles.

Thats handled by the nand driver depending on the chip size.

tglx

Re: Patching only NAND specific stuff possible?

[Marcus Mikolaiczyk]

>>Considering the four Layers (jffs2,mtd,nand,hardware-drivers) it should
>>be possible onloy to 'update' the nand and hardware-drivers stuff.
>>Any objections to this?
> 
> 
> No, as long as you do not ask questions, why it doesnt work. :)
> The current nand driver needs the current mtd layer and JFFS2 from the
> last century will not work with those.

Thanks for this info. The NAND is a large page one with some extented
commands for large page devices. I have an older driver on the system so
the way is to upgrade this one to an appropriate one supporting the
large page nand with it's commands.

Marcus