[U-Boot] NAND read error on Sequoia

[Stefan Roese]

Hi Wolfgang,

[Added Scott to Cc]

On Tuesday 08 December 2009 23:03:28 Wolfgang Denk wrote:
> it seems there is a problem with NAND on Sequoia:
> 
> 	U-Boot 2009.11-rc2 (Dec 08 2009 - 22:52:34)
> 	...
> 	NAND:  32 MiB
> 	...
> 	=> nand read 200000 0 2000000
> 
> 	NAND read: device 0 whole chip
> 	Attempt to read outside the flash area
> 	 33554432 bytes read: ERROR
> 
> As you can see, I try to read the whole device (32 MB), which is
> actually detectd correctly ("device 0 whole chip"), but then is
> misinterpreted ("outside the flash area").

I don't think that this is a Sequoia (4xx NDFC) specific problem. My first  
idea was that this is caused because of bad blocks. Bad blocks are skipped 
upon read, but "nand read" still wants to read 32MByte in total. Which is not 
possible when bad blocks are available.

But this is not the case here. I just verified this on sequoia (most likely 
the one you used). No bad blocks here. And it still fails. Reading with one 
block (block size 16k) less seems to be ok though:

=> nand read 200000 0 1ffc000

NAND read: device 0 offset 0x0, size 0x1ffc000
 33538048 bytes read: OK

And just reading the last block also doesn't work:

=> nand read 200000 1ffc000 4000

NAND read: device 0 offset 0x1ffc000, size 0x4000
Attempt to read outside the flash area
 16384 bytes read: ERROR

Not sure why this is the case. Perhaps an "off by one" error? Scott do you 
have an idea?

Cheers,
Stefan

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