To use i.MX6 SPI-NOR boot.

[satoshishimoda]

Hi community,

I will use SPI-NOR boot for my custom i.MX6Q board.

Then, I want to confirm how to modify MCIMX6Q-SDP board schematic for SPI-NOR boot.

Please my questions below.

[Q1]

According to i.MX 6Dual/6Quad SABRE-SD Linux Release Notes, I understand KEY relative PINs don't support SPI boot.

Then, should I change all SPI-NOR pin assignments  (CLK, MOSI, MISO, CS) from KEY relative pins?

Or can I use if a specified pin is changed from KEY pin?)

(e.g. I can use SPI boot if CS singal is changed from KEY_ROW1 pin to EIM_EB2 pin)

[Q2]

I understand SABRE-AI can boot from SPI-NOR, and it uses EIM_Dxx pins for SPI-NOR.

Then, I want to confirm whether i.MX6 support SPI-NOR boot from pins other than EIM_Dxx.

(e.g. CSI0_DAT pin for SPI clock, DISP0_DAT15 pin for SPI chip select, etc...)

Could you let me know it?

Best Regards,

Satoshi Shimoda

[Yuri · Accepted solution]

In order to define what pin configurations are supported for SPI (NOR) boot, please refer to

Table 8-25 (SPI IOMUX Pin Configuration) of the iMX6 DQ RM.

Also the following may be helpful :

"Unable to boot from SPI-NOR on MX6 Duallite SABRE SDP for smart devices"

Re: Unable to boot from SPI-NOR on MX6 Duallite SABRE SDP for smart devices

[宗標廖]

Hello,Yuri

I have proved my question, it is right.

Best Regards,

ZongbiaoLiao

[宗標廖]

Hello,Yuri

So when I use DISP0_DAT23.att2 for SPI chip select,I can not use the SPI-NOR as boot device,

but when I boot from SD, I can communicate with the SPI-NOR, right?

Best Regards,

ZongbiaoLiao

[Yuri]

  The DISP0_DAT3.alt2 is only used for eCSPI-3 boot (as SS0) and is configured
by boot ROM.

~Yuri.