[U-Boot] [NEXT PATCH v1 2/7] NAND: added NAND type to nand_ids

[Scott Wood]

On 09/07/2012 10:23 AM, Stefano Babic wrote:
> On 07/09/2012 11:12, Stefano Babic wrote:
>> On 07/09/2012 01:19, Scott Wood wrote:
>>> On 09/06/2012 03:04 AM, Stefano Babic wrote:
>>>> Signed-off-by: Stefano Babic <sbabic at denx.de>
>>>> ---
>>
>> Hi Scott,
>>
>>>>  drivers/mtd/nand/nand_ids.c |    2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
>>>> index 3953549..fe75686 100644
>>>> --- a/drivers/mtd/nand/nand_ids.c
>>>> +++ b/drivers/mtd/nand/nand_ids.c
>>>> @@ -131,6 +131,8 @@ const struct nand_flash_dev nand_flash_ids[] = {
>>>>  	/* 128 Gigabit */
>>>>  	{"NAND 16GiB 1,8V 8-bit",	0x1A, 0, 16384, 0, LP_OPTIONS},
>>>>  	{"NAND 16GiB 3,3V 8-bit",	0x3A, 0, 16384, 0, LP_OPTIONS},
>>>> +	{"NAND 16GiB 3,3V 8-bit",	0x48, 4096, 16384, 0x100000,
>>>> +		LP_OPTIONS},
>>>>  	{"NAND 16GiB 1,8V 16-bit",	0x2A, 0, 16384, 0, LP_OPTIONS16},
>>>>  	{"NAND 16GiB 3,3V 16-bit",	0x4A, 0, 16384, 0, LP_OPTIONS16},
>>>>  
>>>>
>>>
>>> Why does this NAND chip need things specified that are zeroes for other
>>> chips?
>>
>> At least on this board with MX35, the chip cannot be recognized.
>> Manufacturer ID and device ID are read flawlessly, but then u-boot fails
>> to get the correct geometry. Setting explicitely the values, I can then
>> read / write into the NAND without any problem. It can be more a problem
>> related to the specific MXC NAND driver (mxc_nand.c).
> 
> It seems to me that the values returned by this flash cannot be
> interpreted in nand_get_flash_type().
> 
> The values returned from a READ-ID command with address 0x00 are:
> 
> 	0x2C 0x48 0x04 0x4A 0xA5,
> 
> I can really get these values from the flash, so the MXC controller gets
> the correct data.
>
> However, the code in nand_base.c (lines from 2718, so not-Samsung case)
> parses the answer setting the NAND as a 16-bit device, but this is
> really a 8bit device. I do not know the meaning of the answer, it is not
> described in the datasheet.

Does the datasheet say anything about what the ID data is supposed to
look like and how to interpret it?  I tried to download it and Micron
shoved an NDA in my face.

What kind of chip is this?  Is the datasheet publicly available?

These threads seem relevant:
http://patchwork.ozlabs.org/patch/60042/
http://old.nabble.com/-U-Boot--Add-new-NAND-flash-td29858370.html

Does the chip support ONFI?

-Scott