I can create a uImage with mkimage with "-C gzip" and it boots fine. If I use "-C none", it hangs on boot with bootm in u-boot. The arguments below come directly from the linux-2.6.35.12 kernel which creates uImage from vmlinux.bin.gz (which is already compressed, I know, but that is a different issue).
In trying to work through how mkimage, uboot, objdump and objcopy interact, my The question becomes "Why does a uImage created with -C gzip boot with bootm and a uImage created with -C none hang?"
In both $ scripts/mkuboot.sh -A ppc -O linux -T kernel -C gzip -a 0x00000000 -e 0x00000000 -n Linux-2.6.35.12-svn438 -d ./vmlinux.bin.gz /tftpboot/uImage Image Name: Linux-2.6.35.12-svn438 Created: Fri May 6 09:05:42 2011 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 1714808 Bytes = 1674.62 kB = 1.64 MB Load Address: 0x00000000 Entry Point: 0x00000000
$ scripts/mkuboot.sh -A ppc -O linux -T kernel -C none -a 0x00000000 -e 0x00000000 -n Linux-2.6.35.12-svn438 -d ./vmlinux.bin.gz /tftpboot/uImage Image Name: Linux-2.6.35.12-svn438 Created: Fri May 6 09:10:31 2011 Image Type: PowerPC Linux Kernel Image (uncompressed) Data Size: 1714808 Bytes = 1674.62 kB = 1.64 MB Load Address: 0x00000000 Entry Point: 0x00000000 ckrinke@hwa:~/svn/trunk/linux-2.6.35.12$ ckrinke@hwa:~/svn/trunk/linux-2.6.35.12$