i.MX ProcessorsのトピックRe: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

nathanpalmer — Tue, 08 Apr 2014 14:51:19 GMT

I have the MCIMX6SLEVK eval board and I am having problems with the on-board SPI NOR. I have tried to probe for the device using the latest U-BOOT built for the EVK and also with the Freescale SDK imx6_platform_sdk_v1.1.0. Both of these fail to read from the device. I just wanted to ask if anyone has gotten the SPI NOR FLASH to work on the MCIMX6SLEVK. The board is REV B, although I don't think that matters from looking at the change log.

Also, is there a public repo to get updates for the Freescale i.MX6 SDK?

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Tue, 08 Apr 2014 16:56:18 GMT

Can you post the changes you did in patch format to add support for the SPI NOR in U-boot?

Regards,

Fabio Estevam

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

nathanpalmer — Tue, 08 Apr 2014 18:32:18 GMT

I used the latest version of u-boot from :

git://git.denx.de/u-boot.git

And applied the attached patch.

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Tue, 08 Apr 2014 18:52:53 GMT

Your CONFIG_SF_DEFAULT_CS configuration does not look correct.

For reference, take a look at:

commit 8bfa9c692e024bcf2b0b95be33adfa710301f83f

Author: Fabio Estevam <fabio.estevam@freescale.com>

Date: Fri Nov 8 16:20:54 2013 -0200

mx6sabresd: Add SPI NOR support

mx6sabre board has a m25p32 SPI NOR connected to ECSPI1 port.

Add support for it.

This patch allows the SPI NOR flash to be succesfully detected:

=> sf probe

SF: Detected M25P32 with page size 256 Bytes, erase size 64 KiB, total 4 MiB

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

nathanpalmer — Tue, 08 Apr 2014 22:09:47 GMT

Ah, I see that the CS is not JUST the chip select, it is an encoded GPIO value to enable long holds for the CS pin. I have made the change:

#define CONFIG_SF_DEFAULT_CS (0 | (IMX_GPIO_NR(4, 11) << 8))

However, it still does not work. I wonder if there is some initialization I missed? Also, is it strange that the SDK doesn't work either?

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Wed, 09 Apr 2014 00:01:25 GMT

I have tried the following patch:

http://pastebin.com/hamK7Ybb

and it fails to probe the SPI NOR:

=> sf probe
SF: Unsupported flash IDs: manuf 00, jedec 0000, ext_jedec 0000

Failed to initialize SPI flash at 0:27392

I would recommend to start a thread at the U-boot list and post the patch as reference for the discussion.

If I launch the kernel, then the SPI NOR flash is correctly probed.

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

nathanpalmer — Wed, 09 Apr 2014 18:42:14 GMT

Thanks for the help. I submitted an email to the u-boot mailing list. let me know if you think of anything else to try.

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Wed, 09 Apr 2014 18:59:10 GMT

Ok, great. I will monitor your thread in the U-boot list then.

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Wed, 09 Apr 2014 19:01:31 GMT

Nathan,

Are you able to check the SPI signals via an oscilloscope? Do you see activity in the MISO/MOSI/CLK and CS lines?

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Fri, 11 Apr 2014 12:20:06 GMT

Nathan,

I have just submitted this patch which fixed the spi nor probe:

http://lists.denx.de/pipermail/u-boot/2014-April/177351.html

Regards,

Fabio Estevam

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

nathanpalmer — Sat, 12 Apr 2014 21:27:53 GMT

That did the trick, Thanks! I got u-boot booting from SPI FLASH. The only other gotcha I had was having to offset the image to 0x400 in the SPI FLASH, is that in the documentation somewhere? I just saw that I had to do that on some random forum.

Re: SPI NOR FLASH Problem on the iMX6SL MCIMX6SLEVK

fabio_estevam — Sat, 12 Apr 2014 21:33:44 GMT

Yes, the required offset is described in the reference manual.