Question, eMMC fast boot of i.MX6SL

[Aemj]

Dear team,

My customer is facing the issue that i.MX6SX cannot boot from eMMAC with fast boot mode on their board.

When they configured BOOT_CFG1[4] to ON(1), the boot from eMMC stopped.

And when BOOT_CFG1[4] is unset, the boot from eMMC can be achieved.

The similar behavior is seen as an actual phenomenon on the other community threads as below, though target chip discussed in those threads is not i.MX6SL.

     https://community.nxp.com/thread/351590

     https://community.nxp.com/thread/354655

On the other hand, in the following thread it is said that BOOT_CFG1[4] should be set for eMMC fast boot of i.MX6SL.

https://community.nxp.com/message/808909

Could you show me which is the correct (BOOT_CFG1[4] should be ON or OFF) for eMMC Fast boot from i.MX6SL?

Thanks,

Miyamoto

[Yuri]

Hello,

  In addition to proper i.MX6 BOOT_CFG configuration (https://community.nxp.com/message/808909), 
the eMMC settings (via sysfs or mmc_utils) needs to be modified to support 'high speed timings in boot'. 

($ echo 14 > boot_bus_config).

Have a great day,
Yuri

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