[U-Boot] Help about a simplified bootloader.

[os user]

Hi,

The data in NAND chip(linux kernel and RootFS)  is the same when
booting linux from U-Boot and from the simple loader. :-(

On Sat, Apr 4, 2009 at 12:53 AM, Scott Wood <scottwood at freescale.com> wrote:
> On Fri, Apr 03, 2009 at 02:44:03PM +0800, os user wrote:
>> I want to boot linux by a simplified bootloader. I use Atmel's ARM
>> chip (AT91SAM9RL64EK board). Now, I can boot linux with my small
>> program. The small program will parse the image generaed by "mkimage"
>> and copy the kernel bianry from NAND flash to SDRAM, construct the tag
>> list, disable I/D cache, disable interrupt and then jump to kernel
>> entry point. The system can startup, but when accessing rootfile
>> system(the rootfile system was also in the NAND chip), a lot of CRC
>> errors were found. See below,
>> mtd->read(0x1fb2c bytes from 0x1804d4) returned ECC error
>> mtd->read(0x1fa38 bytes from 0x3e05c8) returned ECC error
>> mtd->read(0x1f7dc bytes from 0x7c0824) returned ECC error
>> jffs2_scan_inode_node(): CRC failed on node at 0x007c37a4: Read
>> 0xd9b2bc33, calculated 0xda4805c1
>>
>> and sometimes the sytem even crashed when R/W filesystem.
>>
>> But with the same linux kernel and rootfile system, if I use U-Boot to
>> boot linux, everything seems OK.
>>
>> Can anyone tell is there any trick that's related with linux NAND
>> driver in U-Boot? Or any suggestion to help me moving on?
>
> Are you using the same software to program the NAND in each case?  If
> not, perhaps they have a different OOB layout?
>
> -Scott
>