[U-Boot] fw_setenv broken?

[Steve Sakoman <steve@sakoman.com>]

On Wed, 2010-11-17 at 18:39 +0100, Wolfgang Denk wrote:
> Dear Stefano Babic,
> 
> In message <4CE4092B.7090209@denx.de> you wrote:
> > On 11/17/2010 05:30 PM, Steve Sakoman wrote:
> > > I'm seeing some strange behavior with the fw_setenv tools on OMAP.
> > > 
> > > Here's what I see when using the tools on OMAP (overo in this case):
> > > 
> > > 1. fw_printenv prints the environment with no issues [1]
> > > 2. fw_setenv allows me to change a variable with no reported errors [2]
> > > 3. fw_printenv will print the changed environment, however the variables
> > > are not sorted [3]
> > 
> > I tested yesterday on a davinci board, I can confirm this behavior, I
> > have not thought was an error. I do not see any code in fw_env.c to sort
> > variables. I konow the variables are sorted in u-boot, but do we ever
> > have this feature on the userland fw_printenv ?
> 
> Indeed this behaviour is normal. fw_printenv does not sort the output
> (not yet - patches welcome).
> 
> > > I added debug printf's to readenv() in env_nand.c and the root cause is
> > > an error return from ret=nand_read(&nand_info[0], offset, &len,
> > > char_ptr)).  I get an error code of -74
> > > 
> > > Before I spend too much time on this I wanted to check to see if others
> > > are seeing this issue, or whether it might be OMAP specific.
> > 
> > At least this should not be a general failure, because it works on my
> > target. It could be also nand specific.
> 
> Thanks for confirming this.
> 
> Well, the next step should be a review of the code, where error -74
> gets set and what that probably means...

Well, since -74 is EBADMSG, I suspect the error occurs at the following
code in nand_do_read_ops() in nand-base.c:

	if (mtd->ecc_stats.failed - stats.failed)
		return -EBADMSG;

I'm not real familiar with the nand driver code, so I'll add some debug
printfs and see if I can determine why this is happening.

Steve