[U-Boot] Help about a simplified bootloader.

[Shankar Ganesh]

On Tue, Apr 7, 2009 at 11:02 AM, os user <gnusercn at gmail.com> wrote:

> 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?
>

How about ECC calculation ? is it h/w  (GPMC) or s/w ECC ?

Regards,
Shankar


>
> >
> > Are you using the same software to program the NAND in each case?  If
> > not, perhaps they have a different OOB layout?
> >
> > -Scott
> >
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-- 
With Regards,
ShankarGanesh K .







"The most beautiful thing we can experience is the mysterious. It is the
source of all true art and science."