Re: Nand Flash not found.

[Marcus Mikolaiczyk <m.mikolaiczyk@rac.de>]

Hi,

I'm still on the way getting the Samsung NAND discovered, but a small
step has been made.
I've got now a simple testapplication which can read out the NAND IDs
with the readid cmd 0x90 . So I can definitely discover this NAND chip
with this Linux app, but not with the 'derived' linux NAND driver.
Samsung K9F2G08UOM:
Page Size: 2k (+64) Bytes
Block Size: 128k (+4k) Bytes
Organisation: 8 Bit


Code example for external READID cmd:
#define NANDF_DATA            (*((unsigned int volatile *) 0xAE000000))
#define NANDF_COMM            (*((unsigned int volatile *) 0xAE000004))
#define NANDF_ADDR            (*((unsigned int volatile *) 0xAE000008))
...
  value=0x90;
  NANDF_COMM=value;
  value=0x00; // not necessary
  NANDF_ADDR=value;
  va[0]=NANDF_DATA;
  va[1]=NANDF_DATA;
  va[2]=NANDF_DATA;
  va[3]=NANDF_DATA;
  printf("Maker Code: %x     Device Type: %x    DontCare: %x
Organisation: %x\n\r", va[0], va[1], va[2], v
a[3]);
...

Results:
Maker Code: ec     Device Type: da    DontCare: 80    Organisation: 15
SAMSUNG		   3.3V				      See Above Values for Pages Size...

I changed the hardwarespecific part to this values but with no success.
The module does not find the NAND.

static int BTU_NAND_BASE = 0xAE000000;
static int BTU_NAND_VIRT_BASE ;
static int BTU_NAND_RB = 0xF0000C00;
static int BTU_NAND_RB_RDY = (1<<5);
...
static void btutc1130_hwcontrol(struct mtd_info *mtd, int cmd)
{
       struct nand_chip *this = (struct nand_chip *) mtd->priv;
       switch(cmd){
       //Command Latch Enable Settings
       case NAND_CTL_SETCLE: this->IO_ADDR_W = BTU_NAND_BASE + 4; break;
       case NAND_CTL_CLRCLE: this->IO_ADDR_W = BTU_NAND_BASE; break;
       //Address Latch Enable Settings
       case NAND_CTL_SETALE: this->IO_ADDR_W = BTU_NAND_BASE + 8; break;
       case NAND_CTL_CLRALE: this->IO_ADDR_W = BTU_NAND_BASE; break;
       }
}
...
       /* map physical adress */
        BTU_NAND_VIRT_BASE=(unsigned long)ioremap(BTU_NAND_BASE,SZ_4K);
...
        /* Set address of NAND IO lines */
        this->IO_ADDR_R = BTU_NAND_BASE;
        this->IO_ADDR_W = BTU_NAND_BASE;
        this->hwcontrol = btutc1130_hwcontrol;
        this->dev_ready = btutc1130_device_ready;
        /* 20 us command delay time */
        this->chip_delay = 20;
        this->eccmode = NAND_ECC_SOFT;
...

What does the nand_scan function check ?
What else should be adapted (Chip ID list in nand_ids.c)?
Someone any ideas.

Cheers Marcus