When running firmware directly from internal flash (XIP), the startup code defines the following for the image header for "spi_clock_freq" at offset 0x1C
IF :DEF: IMG_BAUDRATE
DCD IMG_BAUDRATE;(0x1C) image baudrate
DCD 0 ; (0x1C) reserved
However, IMG_BAUDRATE is not defined anywhere in the SDK when compiling any example in XIP.
What is the value to set IMG_BAUDRATE when running in XIP mode for best performance ?