Device : i.MX6DL + PF0100A
OS/Version : Linux L3.0.35_4.1.0
Issue : Repeart the Re-boot
Failure rate : 10 per 22,000units (Very rare units)
Target Board : Custom board
The custom board boot-up from eMMC.
But, the failure board repeat the re-boot because of changing the status bit on eMMC (DEVICE is locked).
My customer measured the waveform between i.MX and eMMC at boot-up.
The waveform found the different about behavior of SD4_CLK.
*Refer to below waveform.
We want to confirm the whether or not right operation.
Could you give me an advice about the possible causes?
(Does On-chip boot ROM in i.MX6 have an influence?)