powerpc/bootwrapper: Add documentation of boot wrapper targets

[linux-2.6-omap-h63xx.git] / arch / powerpc / Makefile

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 59ae7d9cdccf6134e33886ce78076850cc99a749..9155c9312c1ec1b182453d5093235ace4f17b9a9 100644 (file)
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -163,12 +163,25 @@ bootwrapper_install %.dtb:
        $(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 
 define archhelp
-  @echo '* zImage          - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
+  @echo '* zImage          - Build default images selected by kernel config'
+  @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
+  @echo '  uImage          - U-Boot native image format'
+  @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
+  @echo '                    versions which do not support device trees'
+  @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
+  @echo '  simpleImage.<dt> - Firmware independent image.'
+  @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
   @echo '  install         - Install kernel using'
   @echo '                    (your) ~/bin/installkernel or'
   @echo '                    (distribution) /sbin/installkernel or'
   @echo '                    install to $$(INSTALL_PATH) and run lilo'
   @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
+  @echo ''
+  @echo '  Targets with <dt> embed a device tree blob inside the image'
+  @echo '  These targets support board with firmware that does not'
+  @echo '  support passing a device tree directly.  Replace <dt> with the'
+  @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
+  @echo '  (minus the .dts extension).'
 endef
 
 install: