nand_scan identification problem

[Artem B. Bityuckiy]

Hi,

I wonder is it possible because of bad timings? spia does not define any 
dev_ready function. I would try to play with this->chip_delay value 
defined in spia.c as 15...

On Thu, 27 Jan 2005, Moises Beck - EDS Digicon wrote:
> 
> Hello,
>      I am using a smartmedia card on linux MTD. Everything runs very
> well. But just after power on, the first attempt to load the driver
> spia.o fails. The driver calls nand_scan(), that cannot identify the
> present card. On the second attempt to load the driver, the flash is
> correctly identified. I saw that in nand_scan(), the command
> NAND_CMD_READID return nand_maf_id=0 and nand_dev_id=0 on the first call
> to it. On the second call the IDs are returned correctly. I tried to
> solve this by putting the following code just before the command
> NAND_CMD_READID, on nand_base.c:
> 
>         /* Select the device */
>         this->select_chip(mtd, 0);
>                                                                        
>         
>         /* by momo - reset smartmedia e put it on mode READ */
>         this->cmdfunc (mtd, NAND_CMD_RESET, -1, -1);
>         this->cmdfunc (mtd, NAND_CMD_READ0, -1, -1);
>                                                                        
>         
>         /* Send the command for reading device ID */
>         this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1);
>                                                                        
>         
>         /* Read manufacturer and device IDs */
>         nand_maf_id = this->read_byte(mtd);
>         nand_dev_id = this->read_byte(mtd);
> 
>      But this does not run, and to problem persists. If the funtion to
> NAND_CMD_READID is called twice, as in
> 
>         /* Select the device */
>         this->select_chip(mtd, 0);
>  
>         /* Send the command for reading device ID */
>         /* by momo - send the command twice !!! */
>         this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1);
>         this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1);
>                                                                        
>         
>         /* Read manufacturer and device IDs */
>         nand_maf_id = this->read_byte(mtd);
>         nand_dev_id = this->read_byte(mtd);
> 
>     then it runs well, always identifying the flash on the first call to
> the funtion nand_scan !!!
>     I am using mtd-snapshot-20050111.
> 
> Anyone has some clue ?
> 
> Thanks,
> Moises
> 
> 
> 
> 
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> 

--
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.