[U-Boot] header files in include/ versus arch/<arch>/include/asm/?

working on MPC8360-based project and noticed that what appears to be a powerpc-specific header file (include/fsl_immap.h) is in the top-level include/ directory, as opposed to where i would have expected it (arch/powerpc/include/asm/).

it's not the only one ... there appear to be others. what is the rationale for installing a header file if it *appears* to be architecture-specific? it seems like there's a fair bit of freescale powerpc content under include/, but maybe i'm just misreading this.

rday