issue with imx35 external boot from Micron 4k flash

[Sascha Hauer]

On Fri, Aug 10, 2012 at 11:11:49AM +0200, Gabriel Tisan wrote:
> Hi !
> 
> I try to boot a custom board(based on imx35)  from a Micron NAND
> flash(4K pagesize, 224 bytes OOB, 256K writesize).
> Using a JTAG debugger, I found that the internal Freescale firmware
> copied the first 4K from flash
> without errors to NFC internal buffer, but then it does not jump to
> this buffer how is specified in specs.
> So the barebox code is never called.
> If I jump manually via JTAG debugger, barebox boot up without any
> problems. I use external boot and write/dump to/from flash works well.
> Of course for imx35 I used just the supported 218 bytes of OOB.
> 
> Freescale support told me that there is a boot problem with imx35 when
> is used with flashes that need more time after RESET command.
> On the same board I used before also a Micron flash(2K pagesize, 64
> bytes OOB, 128K writesize) that has the same hardware timing for
> RESET.
> However I suppose that the flash is out of RESET, because otherwise
> could not copy without any ECC error the first 4K data.
> 
> Has anybody experienced some kind of problems ? Do you see a workaround ?

Never seen this. Maybe you could try internal boot mode?

Sascha

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