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MCIMX6UL-EVKB Revision Changes stop SD card from booting?

Question asked by James McCusker on May 20, 2020
Latest reply on May 26, 2020 by James McCusker

For development we have been using MCIMX6UL-EVKB kits from NXP (arrived as SCH-28617 Rev C5) and everything works as it should.

 

Recently we purchases (3) more MCIMX6UL-EVKB kits from NXP (arrived as SCH-28617 Rec C6), and the code we have been developing no longer even loads the SPL from the SD slot. The only way we can get to the Uboot prompt is a serial downloader (ie - run from RAM).

 

Given that the SCH numbers are identical, the only difference we see is the MX6 itself (MCIMX6G2AVM07AB on the new boards vs MCIMX6G2CVM05AA) where the newer IMX6 is automotive and can run up to 700MHz, where ours are commercial and up to 500MHz.

 

Since we cannot find schematics for the newer SoC (Rev C6), we were hoping someone could enlighten us to any changes electrically to these boards?

 

Also the eFuses are mysteriously not identical to our Rev C5:

 

MCIMX6UL-EVKB Rev 5
=> fuse read 0 0 8
Reading bank 0:
Word 0x00000000: 00328003 e6b559fa 472c09d4 7031003c
Word 0x00000004: 02410002 00000000 00000000 00000000 <- Note Word 6

 

MCIMX6UL-EVKB Rev 6
=> fuse read 0 0 8
Reading bank 0:
Word 0x00000000: 00328003 ea9b89dc 3908c9d4 7032006b
Word 0x00000004: 02420002 00000000 00080040 00000000 <- Note Word 6

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