On 09/11/12 14:46, Arnd Bergmann wrote:

On Wednesday 31 October 2012, James Hogan wrote:

quoted

+
+define archhelp
+  echo  '* vmlinux.bin	- Binary kernel image (arch/$(ARCH)/boot/vmlinux.bin)'
+  @echo '  uImage  	- Alias to bootable U-Boot image'
+  @echo '  uImage.bin	- Kernel-only image for U-Boot (bin)'
+  @echo '  uImage.gz	- Kernel-only image for U-Boot (gzip)'
+  @echo '  uImage.bz2	- Kernel-only image for U-Boot (bzip2)'
+  @echo '  uImage.lzma	- Kernel-only image for U-Boot (lzma)'
+  @echo '  uImage.xz	- Kernel-only image for U-Boot (xz)'
+  @echo '  uImage.lzo	- Kernel-only image for U-Boot (lzo)'
+endef

The uImage format is causing some trouble on ARM because it requires knowing
the load address at boot time, so we try to move people towards using just
zImage files there. You might want to consider the same.

Could you point me at some info about this problem? I'm not clear why
needing to know the load address at boot is a problem, or how zImage
helps. Does this presume that the bootloader starts the kernel with the
MMU bypassed?

It's probably not necessary to have both lzma and xz formats since they
are the same algorithm with different headers afaik.

This was copied from arch/sh/boot/Makefile if I remember right. Is
either of them preferred?

Thanks
James