[U-Boot] NAND on eLBC

[U-Boot] NAND on eLBC

[Andre Schwarz]

Scott,

looks like I made a mistake on current MPC8377 NAND wiring.

Nand-Flash "write enable" is wired to LFWE1 ... I connected each WE to 
its corresponding CS, i.e. :

- CS0/WE0 -> Nor Flash
- CS1/WE1 -> Nand Flash
- CS2/WE2 -> MRAM

Am I assuming right that FCM can only use WE0 ?

Do you see any issue with connecting all devices to WE0 since they have 
distinct chip selects ?


Regards,
Andr?

MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner

[U-Boot] NAND on eLBC

[Scott Wood]

On Fri, 5 Nov 2010 10:21:53 +0100
Andre Schwarz <andre.schwarz@matrix-vision.de> wrote:

> Scott,
> 
> looks like I made a mistake on current MPC8377 NAND wiring.
> 
> Nand-Flash "write enable" is wired to LFWE1 ... I connected each WE to 
> its corresponding CS, i.e. :
> 
> - CS0/WE0 -> Nor Flash
> - CS1/WE1 -> Nand Flash
> - CS2/WE2 -> MRAM
> 
> Am I assuming right that FCM can only use WE0 ?

I think so.  It looks like the other lines were meant to be byte
selects for NOR/UPM, not anything to do with the chip select.

> Do you see any issue with connecting all devices to WE0 since they have 
> distinct chip selects ?

I guess not, especially if that's the only way the FCM works.

But to be sure, maybe ask official Freescale support channels, and/or
someone who's more familiar with the hardware side of this stuff.

-Scott

[U-Boot] NAND on eLBC

[Andre Schwarz]

Scott,

>> looks like I made a mistake on current MPC8377 NAND wiring.
>>
>> Nand-Flash "write enable" is wired to LFWE1 ... I connected each WE to
>> its corresponding CS, i.e. :
>>
>> - CS0/WE0 ->  Nor Flash
>> - CS1/WE1 ->  Nand Flash
>> - CS2/WE2 ->  MRAM
>>
>> Am I assuming right that FCM can only use WE0 ?
>>      
> I think so.  It looks like the other lines were meant to be byte
> selects for NOR/UPM, not anything to do with the chip select.
>    
ok - understood.

>> Do you see any issue with connecting all devices to WE0 since they have
>> distinct chip selects ?
>>      
> I guess not, especially if that's the only way the FCM works.
>    
After some rework (LFWE1->LFWE0) the NAND Flash is now working fine.




Regards,
Andr?

MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner