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If CONFIG_DM_DEV_READ_INLINE is set, dev_read_alias_highest_id() calls libfdt_get_highest_id(). But this function is only available if we have libfdt compiled in. If its not available return -1, which matches the return code for no alias found. This fixes the following error on omapl138_lcdk: arm-linux-gnueabi-ld.bfd: drivers/built-in.o: in function `dev_read_alias_highest_id': /home/mw/repo/u-boot/include/dm/read.h:986: undefined reference to `fdtdec_get_alias_highest_id' Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Simon Glass <sjg@chromium.org>