Re: Problem of coldboot on i.MX27 board with Micron NAND

Hi Eric,
On 03/19/2014 09:47 AM, Eric Bénard wrote:
> Hi Gaëtan,
>
> Le Tue, 18 Mar 2014 15:55:54 +0100,
> Gaëtan Carlier <[email protected]> a écrit :
>> I have a problem with redboot (release 20050912) with Freescale patches
>> for i.MX27 PDK (3-stack) and seems to be related to NAND chip (all other
>> components are identical).
>> When I power on the board, nothing happened on serial console but when I
>> press reset button (or if I reset board using JTAG, to board boot properly.
>>
>> With NAND Numonyx NAND02G-B2D, it works well on power on but with Micron
>> MT29F2G08ABBEAH4, coldboot does not work, I have to press RESET button.
>>
>> The specs seem to be similar. The only difference is a device
>> initialization for Micron that says that host must wait 100us after VCC
>> is applied before sending Reset (FFh) command.
>> Where have I to place the wait loop ?
>> At the beginning of In PLATFORM_SETUP1 macro (.macro _platform_setup1)
>> in hal_platform_setup.h or anywhere else ?
>>
>> Test is done on boards with i.MX27 CPUs that have different revision
>> (200951, 201209). And I know that newer revison (starting from 2012) can
>> freeze at boot due to bug in PLL circuit.
>> Do you have any other leads for me ?
>>
> Micron NAND need a reset command at boot and i.MX27's BootROM doesn't
> send it when using external boot.
> See the note in page 5 of this AN :
> cache.freescale.com/files/dsp/doc/app_note/AN3672.pdf
>
> Internal NAND boot seems to works based on this thread (not tested
> here) : https://community.freescale.com/thread/285717
>
So it is not possible to boot correctly on external Micron NAND flash 
using i.MX27 ?!
> Eric
>
Thank you for your help,
Gaëtan Carlier.


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