The RedBoot user's guide documents using $ECOS_REPOSITORY, e.g. for importing
like:
ecosconfig import \
${ECOS_REPOSITORY}/hal/${ARCH_DIR}/${PLATFORM_DIR}/${VERSION}/misc/redboot_RAM.ecm

However on cygwin ${ECOS_REPOSITORY} is in fact a windows style, not cygwin
style path, i.e. C:\Program Files\Red Hat......

ecosconfig works with this, but it doesn't work when like above the shell has to
interpret it to point to a real file name as it just becomes a mixture of both
path styles.

So either the RedBoot guide should document this correctly for cygwin, e.g. by
using
ECOS_REPO=`cygpath -u "$ECOS_REPOSITORY"`
ecosconfig import "${ECOS_REPO}"/hal/.....

or develop.bat on cygwin should be modified to use a cygwin path. The
documentation may need to be updated for ecosconfig in that case too so that it
doesn't recommend windows style paths.