[U-Boot] uImage load address and entry point with Minnowboard

[Simon Glass]

Hi,

On 22 June 2016 at 08:50, vinoth eswaran <evinoth1206 at gmail.com> wrote:
> 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

You should be using FIT, with the x86-fit-boot.txt that you mention in
your other email. With this command line, you won't get setup.bin. But
x86 needs this.

> 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
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Regards,
Simon