Big Endian for i.MX27: looks like it’s not working

I managed to launch the CPU in big endian mode, and it even executes
some part of u-boot code. But the serial is silent, and MTD driver can’t find
any NAND chips.

The UART control registers receive correct values, I verified this.
So, most probably the UART hardware fails to get those values from a big-endian CPU.

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