From: "Eric Bénard" <eric@eukrea.com>
To: "Gaëtan Carlier" <gcembed@gmail.com>
Cc: ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] Problem of coldboot on i.MX27 board with Micron NAND
Date: Wed, 19 Mar 2014 08:48:00 -0000 [thread overview]
Message-ID: <20140319094746.4e44f753@e6520eb> (raw)
In-Reply-To: <53285E7A.5040102@gmail.com>
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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next prev parent reply other threads:[~2014-03-19 8:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-18 14:56 Gaëtan Carlier
2014-03-19 8:48 ` Eric Bénard [this message]
2014-03-19 14:44 ` Gaëtan Carlier
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