[Buildroot] [RFC/PATCH] linux: remove the zImage before rebuild

[Hollis Blanchard <hollis_blanchard@mentor.com>]

On 07/17/2015 10:41 AM, Thomas Petazzoni wrote:
> One thing that we should do is to generalize this appended DTB
> mechanism to make it possible to generate several appended images.
> Currently, since we append to the zImage directly, we cannot generate
> several images, each using a different DTB. By generating to
> zImage.<dtb-name>, we can generate multiple images (and also avoid the
> overwriting problem).

A bit of a tangent now, but I am trying to write a recipe for another 
bootwrapper, which prepends a little code to a zImage/DTB combo. Right 
now, it basically boils down to this:

    define BOOT_WRAPPER_ARM_BUILD_CMDS

         $(MAKE) CROSS_COMPILE=$(TARGET_CROSS) DTBIMAGE=$(BINARIES_DIR)/zImage -C $(@D)

    endef


Practically speaking, I think the bootwrapper is only really useful in 
the BR2_LINUX_KERNEL_APPENDED_ZIMAGE case, and I can enforce that via 
Kconfig dependencies, so I can assume the kernel name is "zImage".

If your idea above is implemented, would I need to duplicate the 
linux.mk logic around  BR2_LINUX_KERNEL_USE_INTREE_DTS, 
BR2_LINUX_KERNEL_INTREE_DTS_NAME, BR2_LINUX_KERNEL_USE_CUSTOM_DTS, and 
BR2_LINUX_KERNEL_CUSTOM_DTS_PATH? Or is there a better way to do this?

Thanks.

Hollis Blanchard
Mentor Graphics Emulation Division
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20150717/ae8ff273/attachment.html>