[U-Boot] [PATCH v7 04/19] imx: mx53ard: Add support for NAND Flash

Benoît Thébaudeau
2013-02-26T16:53:48Z

Hi Fabio,

On Tuesday, February 26, 2013 3:21:25 PM, Fabio Estevam wrote:
> Hi Beno?t,
>
> On Tue, Feb 26, 2013 at 10:35 AM, Fabio Estevam <festevam@gmail.com> wrote:
>
> > Yes, after using the same IOMUX from FSL U-boot I get:
> >
> > NAND: NAND device: Manufacturer ID: 0xec, Chip ID: 0xd5 (Samsung NAND 2GiB
> > 3,3)
> > NAND bus width 16 instead 8 bit
> > No NAND device found!!!
> > 0 MiB
>
> This should be fixed separetely and it is not related to your patch. I
> will submit a patch for this 16-bit detection issue

OK. Please update all boards using mxc_nand.

> I was able to read and write to NAND, I have also tested to save env
> vars into NAND and it works fine.

Great! Thanks for testing.

> So, after changing the IOMUX as per FSL U-boot

If I look at FSL's setup_nfc() vs. my setup_iomux_nand():
- The IOMUX setup is the same, with CS1 and DA0-7 left in their reset ALT0
mode.
- The pad setups differ from the reset values in FSL's code, so I think that
this is all that needs to be changed (i.e. adding the mxc_iomux_set_pad()).
Can you confirm?
- Are 'M4IF_GPR.MM = 0' and 'EIM_CSxGCR2[12] = 0' also required, or is this
handled properly by your board through BOOT_CFG1[6]? I think that we should
enforce this too by software for the same reason as for bus width.

> you can add my:
> Tested-by: Fabio Estevam <fabio.estevam@freescale.com>

Will do, thanks again. So for 01-03, and 15 (with 0x32000). Do you agree?

Best regards,
Beno?t