[SPI-855] Flash Boot Fails at 1.8 V VDD_SPI
Description
The voltage corresponding to the default value of EXT_LDO_DREF is not 1.8 V, and the chip cannot boot from flash under 1.8 V VDD_SPI conditions.
Workarounds
Boot from flash using 3.3 V VDD_SPI.
Solution
To be fixed in the next chip revision.