On Mon, 2004-12-06 at 02:25, Aras Vaichas wrote:
>  > It's quite easy, if the timing is wrong or if the rdy/busy check is not
>  > reliable.
> 
> Is there a utility that writes to every single page, reads back the data and 
> then marks the pages correctly? 

No.

> Or are those "bad eraseblocks" permanently lost?

You can hack nand_base.c to allow the erasing of the blocks which are
marked bad.


> static void at91_nand_command (struct mtd_info *mtd, unsigned command, int column, int page_addr)

	my_nand->cmdfunc = at91_nand_command;	/* we need our own */

You don't need your own command function. There is no reason for it. It
is just duplicated code. 
	
> 	/* Scan to find existance of the device */
> // ARASV
> #define CHIPS_TO_SCAN	1
> 	if (nand_scan (at91_mtd, CHIPS_TO_SCAN)) {
> 		err = -ENXIO;
> 		goto out_ior;
> 	}
> 
> 	/* Allocate memory for internal data buffer */
> 	my_nand->data_buf = kmalloc (sizeof(u_char) * (at91_mtd->oobblock + at91_mtd->oobsize), GFP_KERNEL);
> 	if (!my_nand->data_buf) {
> 		printk ("Unable to allocate AT91 NAND data buffer.\n");
> 		err = -ENOMEM;
> 		goto out_ior;
> 	}

The data buffer is already allocated inside nand_scan. 

tglx