Boot up from onboard NOR or NAND flash for 'SABRE for Automotive Infotainment Based on the i.MX 6 Series' evaluation board.

[stevencao]

Hi,
I have a 'SABRE for Automotive Infotainment
Based on the i.MX 6 Series' evaluation board.
My onboard CPU is IMX6U which is i.MX 6DualLite processor.

I have succeeded in booting up this board from SD card.

I used 'LTIB' tool to build the source code on a Ubuntu 12.04 laptop.

A few questions:

1. Is there any way from U-boot to read the SD card? If yes, what is the command and SD card address?

2. I would like to boot up from onboard NOR or NAND flash. In other words, u-boot, kernel and file system needs to be stored over there too. Can I do that? If yes, any help file on this other than jumper setting?

3. I wanted to flash a customized u-boot to SD card. I looked at the community and got the following information:

              boot on SD card starts at 1k location, so I can use the following command to do that:

     sudo dd if=./u-boot/u-boot.imx of=${DISK} bs=512 seek=2

     I don't have a 'u-boot.imx' after 'LTIB' build. Instead, I only got the binary one, u-boot.bin. Are they the same?

Thanks,

Steven

[Yuri]

1.

Please use U-boot help command to know what options are supported
by current implementation.

As an example, from my SDP :

MX6Q SABRESD U-Boot > help mmc

mmc - MMC sub system

Usage:

mmc read addr blk# cnt

mmc write addr blk# cnt

mmc erase blk# cnt

mmc rescan

mmc part - lists available partition on current mmc device

mmc dev [dev] [part] - show or set current mmc device [partition]

mmc bootpart [dev] [part] - show or set boot partition

mmc list - lists available devices

MX6Q SABRESD U-Boot > help mmcinfo

mmcinfo - display MMC info

Usage:

mmcinfo     - device number of the device to dislay info of

MX6Q SABRESD U-Boot >

2.
Please look at Linux documentation, in particular – use Linux User’s Guide:

“i.MX_6Dual6Quad_Sabre-AI_Linux_User's_Guide.pdf”

https://www.freescale.com/webapp/Download?colCode=L3.0.35_4.0.0_LINUX_DOCS&location=null

https://www.freescale.com/webapp/Download?colCode=L3.0.35_4.0.0_ER_SOURCE&appType=license&location=n...

Summary Page :

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=i.MX6D&fpsp=1&tab=Design_Tools_Tab

3.

According to Chapter 8 (Using a Linux Host to Set Up an SD/MMC Card) of the User’s Guide :

$ sudo dd if=u-boot-mx6q-sabreauto.bin of=/dev/sdb bs=512 seek=2 skip=2 conv=fsync

[stevencao]

Hi,

Thanks for the reply.

For question 1, I looked at my board and the SD card is MMC 2. I ran the following commands:

************************************************************

MX6SOLO SABREAUTO U-Boot > mmc dev 2
mmc2 is current device
MX6SOLO SABREAUTO U-Boot > mmc read 10800000 0 100

MMC read: dev # 2, block # 0, count 256 ... 256 blocks read: OK
MX6SOLO SABREAUTO U-Boot >

***********************************************************

How can I display the readback data? Command 'mmc' did not show me the real data.

Thanks,

Steven

[Yuri]

Please use U-boot command md (memory display) to show data at specified address (0x10800000 in the case)