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Hi Eric, On 03/19/2014 09:47 AM, Eric Bénard wrote:
So it is not possible to boot correctly on external Micron NAND flash using i.MX27 ?!Hi Gaëtan, Le Tue, 18 Mar 2014 15:55:54 +0100, Gaëtan Carlier <gcembed@xxxxxxxxx> 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
Thank you for your help, Gaëtan Carlier. -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss