Atmel website | ARM Community | AVR freaks | Technical Support
Banner
Welcome to AT91SAM Community Forum
http://www.at91.com/samphpbb/

how to add a partition in nandflash?
http://www.at91.com/samphpbb/viewtopic.php?f=12&t=20299		 Page 1 of 1
Author:  bluetooth [ Tue Jul 26, 2011 12:02 pm ]
Post subject:  how to add a partition in nandflash?
hi all:
i'm using atmel 9g20 ,nandflash,uboot and linux 2.6.x kernel.
now,there are 3 partitions in nandflash,i want to add a partition, but i don't know if need to modify the uboot source code? if need, which c file need be changed?

I think the kernel code must be changed,but i also don't know which c file need be re-design? Please give me a hint!

Thanks for your help!
Author:  Andrej [ Wed Jul 27, 2011 7:39 am ]
Post subject:  Re: how to add a partition in nandflash?
Add new NAND flash partition to struct mtd_partition __initdata ek_nand_partition[]
in kernel file: arch/arm/mach-at91/board-sam9g20ek.c
and change size for partitions.

Example:

/*
* NAND flash
*/
static struct mtd_partition __initdata ek_nand_partition[] = {
{
.name = "Bootstrap",
.offset = 0,
.size = 4 * SZ_1M,
},
{
.name = "Partition 1",
.offset = MTDPART_OFS_NXTBLK,
.size = 60 * SZ_1M,
},
{
.name = "Partition 2",
.offset = MTDPART_OFS_NXTBLK,
.size = 30 * SZ_1M, // change partition size
},

// add new partition:
{
.name = "Partition 3",
.offset = MTDPART_OFS_NXTBLK,
.size = MTDPART_SIZ_FULL,
},

};

A.
Author:  bluetooth [ Wed Jul 27, 2011 9:32 am ]
Post subject:  Re: how to add a partition in nandflash?
I got it.
Thanks,Andrej.

I have 2 questions:
(1) how to set the nand partition type? for examples, I want to config the "Partition 1" as yaffs type and "Partition 2" as jffs2 type, I'm able to use the mount command for loading them.But the static struct mtd_partition __initdata ek_nand_partition[] array hasn't partition type column, how to do this?

(2)How to format the nandflash partition? for example,"partition 2" is a jffs2 filesystem,before using it ,need i format it(/dev/mtdblock2)? As if format NTFS partiton of harddisk.

Thanks,
Author:  Andrej [ Wed Jul 27, 2011 10:31 am ]
Post subject:  Re: how to add a partition in nandflash?
For jffs2 file system try to use flash_erase command with -j option.

link: http://processors.wiki.ti.com/index.php ... e_to_Flash

A.
Author:  bluetooth [ Thu Jul 28, 2011 5:38 am ]
Post subject:  Re: how to add a partition in nandflash?
Thanks,Andrej.
Page 1 of 1 All times are UTC + 1 hour [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/