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Unable to read IMX7S QuadSPI LUT registers

Question asked by Mark Vismer on Jun 15, 2018
Latest reply on Jul 17, 2018 by Mark Vismer

Hello

 

I am trying to debug some QuadSPI problems and ran into the follow odd behaviour when attempting to read from memory from a u-boot shell.

The reference manual says the LUT Key Register (QuadSPIx_LUTKEY) is at Base address + 300h offset, and Look-up Table register (QuadSPIx_LUT0) is at Base address + 310h offset.
However I cannot seem to read them. The base address for the QuadSPI is 0x30BB0000

=> md 0x30bb0300 4
30bb0300: ffffffff ffffffff ffffffff ffffffff    ................

The reset value for (QuadSPIx_LUTKEY) should not be 0xfffffff

 

Reading Serial Flash Address Register (QuadSPIx_SFAR) at Base address + 100h offset yields:

 

> md 0x30bb0100 4
30bb0100: 6008ff80 00000000 00000000 00000000    ...`............

 

Which seems right...

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