Micron Nand at GPMC CHIP SELECT 7 configuraion

santosh vastrad

Expert 2060 points

Other Parts Discussed in Thread: AM3703

Hi all:

I wanted to access the nand flash, which is at chip select 7 of the gpmc intreface!

AM3703 custom board!

omap3_beagle.h => I 've given the chip select 7 address as : 0x3800 0000 (128 * 7 * 1024 * 1024)!

in mem.h => configured all the gpmc registers for micron nand flash!

in mem.c => enabling the gpmc registers at chip select 7!

GPMC_BASE => 0x6E00 0000 * CONFIG_WIDTH * CHIP SELECT;

CONFIG_WIDTH = 0x30

CHIP SELECT = 7

After doing all these things, i 'm compiling the u-boot , i should get the device id and manufacture id of the nand flash at chip select 7!

But i'm unable to do this?

what else i need to do?

Regards,

santosh vastrad

over 13 years ago

0 JJD over 13 years ago

TI__Guru* 86550 points

Santosh, you didn't mention any pin muxing, so this might be your issue. You have to enable CS7 in the proper mux mode in order to properly use it with the GPMC module. This is typically setup in u-boot board specific file (eg, evm.h)

Regards,

James

0 santosh vastrad over 13 years ago in reply to JJD

Expert 2060 points

Hi James,

Yes i did pin muxing in beagle.h file

MUX_VAL(CP(GPMC_NCS7) (IDIS | PTU | EN | M0)

I suspect the mistake is ,

check out in nand_base.c file sir!

Before getting device id and manufacture id of the nand flash , nand->select_chip (mtd, 0);

here 0 : chip select 0

so i changed by making above statement as

nand->select_chip (mtd, 7);

still i'm unable to get the information of the nand flash!

Regards,

santosh vastrad

0 Steve Kipisz over 13 years ago

TI__Genius 15510 points

What version of u-boot are you using?

Steve K.

0 santosh vastrad over 13 years ago in reply to Steve Kipisz

Expert 2060 points

Hi steve:

The version of my u-boot is :

u-boot-03.00.02.07

Regards,

santosh vastrad

Processors

Processors forum

Micron Nand at GPMC CHIP SELECT 7 configuraion