Reading data from NAND FLASH without ECC is not recommended

Hi all! Sorry for my poor english.
I want to ask - why by default reading from NAND flash provided without ECC?
I work with Samsung K9F5608U0С 32M flash.
And one interest thing for me is that debug messages show that oob bytes for ECC are used by system. I mean, after eraseing - all bytes are 0xFF. But my debug messages shows this:

bytes for ECC are not equal 0xFF!
but system dont use this bytes for ECC correction:

You're saying that the system _writes_ ECC data to the flash, but does not use ECC when reading from the flash?

Please show your NAND board driver, and also the code you used for reading from the flash.

dwmw2

Hello David,

Wednesday, May 17, 2006, 6:36:46 AM, you wrote:

DW> You're saying that the system _writes_ ECC data to the flash, but does DW> not use ECC when reading from the flash?

DW> Please show your NAND board driver, and also the code you used for DW> reading from the flash.

Setup mtd device from NAND board driver:

        /* Set address of NAND IO lines */
        this->IO_ADDR_R = (void __iomem *)adm5120_fio_base;
        this->IO_ADDR_W = (void __iomem *)adm5120_fio_base;
        /* Set address of hardware control function */       
        this->hwcontrol = adm5120_hwcontrol;
        this->dev_ready = adm5120_device_ready;
       /* 20 us command delay time */
       this->chip_delay = 20;
       this->eccmode = NAND_ECC_SOFT;

and I attach nand_base driver from my kernel.

Best regards,
 art                            mailto:[email protected]

Either this is the same as the one in the current kernel tree, or it's the one from 2.6.16, or I don't care at all. Which of the three?

dwmw2