[meta-freescale] two NAND support

[Volkov Еugene]

Hi, all. I use BSP freescale 3.10.53. i.mx6 processor.
I need You help! In my custom board i use two NAND. But, i can not change u-boot, and kernel, to get them working.
1 I change DTS file.
...
MX6QDL_PAD_NANDF_CS0__NAND_CE0_B 0xb0b1
MX6QDL_PAD_NANDF_CS2__NAND_CE2_B 0xb0b1
...
2 I add in nand_ids chip ID list
{"S34ML01G100TFI00 1G 3.3V 8-bit", { .id = {0x01, 0xF1, 0x00, 0x1D} }, SZ_2K, SZ_128, SZ_128K, 0, 8, 64, NAND_ECC_INFO(1, SZ_512) },
3 
in u-boot bard config i set SYS_MAX_NAND_DEVICE 2
I also tried SYS_MAX_NAND_СHIP to 2
and combinations thereof
 
But this not work. 
Hi, all.
I need You help! In my custom board i use two NAND. But, i can not change u-boot, and kernel, to get them working.
1 I change DTS file.
...
MX6QDL_PAD_NANDF_CS0__NAND_CE0_B 0xb0b1
MX6QDL_PAD_NANDF_CS2__NAND_CE2_B 0xb0b1
...
2 I add in nand_ids chip ID list in u- boot
{
"NAND 128MiB 3,3V 8-bit", 0xf1, 2048, 128, 0x10000, 0}, /* S34ML01G1 */
}
and in linux
{"S34ML01G100TFI00 1G 3.3V 8-bit", { .id = {0x01, 0xF1, 0x00, 0x1D} }, SZ_2K, SZ_128, SZ_128K, 0, 8, 64, NAND_ECC_INFO(1, SZ_512) },
3 
in u-boot bard config i set SYS_MAX_NAND_DEVICE 2
I also tried SYS_MAX_NAND_СHIP to 2
and combinations thereof

But this not work. 
In u-boot, use command nand info i see when
Device 0: nand0, sector size 64 KiB
Page size 2048 b
OOB size 64 b
Erase size 65536 b
Device 1: nand1, sector size 64 KiB
Page size 2048 b
OOB size 64 b
Erase size 65536 b

I can set nand device 1, but when i read nand, use nand dump - in osciloscope i see, that is always used NAND_CE0.

In kernel 
......
nand: device found, Manufacturer ID: 0x01, Chip ID: 0xf1
nand: AMD/Spansion S34ML01G100TFI00 1G 3.3V 8-bit
nand: 128MiB, SLC, page size: 2048, OOB size: 64
Bad block table found at page 65472, version 0x01
Bad block table found at page 65408, version 0x01
gpmi-nand 112000.gpmi-nand: driver registered.
.
root at imx6solosabreauto:~# cat /proc/mtd
dev: size erasesize name
mtd0: 08000000 00020000 "gpmi-nand"
Linux registered one NAND.
I began to look for the cause in the driver.
Function gpmi_nand_init call nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL).
In this function, code that scan chip
/* Check for a chip array */
for (i = 1; i < maxchips; i++) {
chip->select_chip(mtd, i);
/* See comment in nand_get_flash_type for reset */
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);

/* Read manufacturer and device IDs */
if (nand_maf_id != chip->read_byte(mtd) ||
nand_dev_id != chip->read_byte(mtd)) {
chip->select_chip(mtd, -1);
break;
}
select_chip(mtd, i) - should set CEn(CE0,CE1,CE2) in low level. Then it would be all worked fine.
But, this function not work do not do this
/**
* nand_select_chip - [DEFAULT] control CE line 
* @mtd: MTD device structure
* @chipnr: chipnumber to select, -1 for deselect 
*
* Default select function for 1 chip devices. 
*/
static void nand_select_chip(struct mtd_info *mtd, int chipnr) 
{
struct nand_chip *chip = mtd->priv;
switch (chipnr) { 
case -1:
chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE); 
break;
case 0:
break;
default:
BUG();
} 
}
It stopped me. I do not know how to write cmd_ctrl function, that set CE2 to low level. 
Maybe I'm wrong and this code is working, but I can not achieve that would choose, any other chip select.
Eugene Volkov
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