[ECOS] Problem of coldboot on i.MX27 board with Micron NAND

[ECOS] Problem of coldboot on i.MX27 board with Micron NAND

[Gaëtan Carlier]

Hello,
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 ?

Thank you for your help.

Gaëtan Carlier.

ps : Of course, I have tried MT29 NAND on several board (that works with 
NAND02G chip) but same result.

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

[Eric Bénard]

Hi Gaëtan,

Le Tue, 18 Mar 2014 15:55:54 +0100,
Gaëtan Carlier <gcembed@gmail.com> 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

Eric

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

[Gaëtan Carlier]

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 <gcembed@gmail.com> 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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