Hello,
I am working on an embedded project to optimize the boot time on minnowboard. Currently I am working with the u-boot. With compressed kernel (bzImage) everything works fine, I want to check the performance with uncompressed kernel (vmlinux).
I have found that u-boot cannot support the raw vmlinux and I need to generate the uImage using the u-boot tools.
I tried creating the uImage from the vmlinux --but I did not understand what does the -a (load address) and -e (entry point ) points to? I assume that it is the same load address used when loading the kernel image from sd card to RAM.
uImage creation:
mkimage -A x86 -O linux -T kernel -a 0x01000000 -e 0x01000000 -n Linux -d vmlinux uImage Image Name: Linux Created: Wed Jun 22 16:31:07 2016 Image Type: Intel x86 Linux Kernel Image (gzip compressed) Data Size: 21966248 Bytes = 21451.41 kB = 20.95 MB Load Address: 01000000 Entry Point: 01000000
Now at start up I am seeing that the kernel is not running, Seeing the following error messages,
reading uImage 21966312 bytes read in 481 ms (43.6 MiB/s) Wrong Image Format for bootm command ERROR: can't get kernel image!
The bootcmd is "bootcmd=fatload mmc 0:1 01000000 uImage ; bootm 01000000"
Do you have any idea why it is happening?
Mit Freundlichen Grüßen VinothKumar +49 1798909072