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Extract an uImage
According to the U-Boot header definition an uImage begins with the hex byte sequence 27 05 19 56 and the header is 64 bytes long.
dd if=uImage of=zImage ibs=64 skip=1
1.
root@arm:~# uname -a
Linux arm 3.0.42-slitaz #2 PREEMPT Thu Sep 27 18:30:18 UTC 2012 armv7l GNU/Linux
2.
# tazpkg install u-boot-tools-2012.04.01-2.tazpkg
3.
root@slitaz:/usr/src/linux# time make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- -j4 uImage
[..]
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready
UIMAGE arch/arm/boot/uImage
Image Name: Linux-3.0.42-slitaz
Created: Thu Sep 27 18:30:24 2012
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3906268 Bytes = 3814.71 kB = 3.73 MB
Load Address: 40008000
Entry Point: 40008000
Image arch/arm/boot/uImage is ready
real 5m53.737s
user 10m26.467s
sys 0m47.126s
4.
root@slitaz:/usr/src/linux# ls -l arch/arm/boot/*mage
-rwxr-xr-x 1 root root 8171044 Sep 27 18:30 arch/arm/boot/Image
-rw-r--r-- 1 root root 3906332 Sep 27 18:30 arch/arm/boot/uImage
-rwxr-xr-x 1 root root 3906268 Sep 27 18:30 arch/arm/boot/zImage
5.
root@slitaz:/usr/src/linux# calc 3906332-3906268
64
Ref:
Building
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- sun4i_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j4 uImage modules
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- INSTALL_MOD_PATH=output modules_install
.
