[U-Boot-Users] Using tools/mkimage
Wolfgang Denk
wd at denx.de
Tue Aug 5 09:08:22 CEST 2003
In message <20030805020001.GA15284 at buici.com> you wrote:
> I'm having trouble understanding how an image should be created.
See the README. See the U-Boot and Linux Guide
at http://www.denx.de/twiki/bin/view/DULG/WebHome
> It was my intention to use the zImage file already compressed with a
> loader. RAM starts at 0xc0000000, the kernel wants to load, after
It makes no sense to use a zImage file. It was one of the intentions
of U-Bot (well, it was PPCBoot then) to get rid of this bootstrap
loader.
> decompression, to 0xc00c8000. Normally, compressed kernel images are
> loaded at 0xc0008000.
>
> tools/mkimage -A arm -C none -a 0xc0008000 -d zImage image
I don't see any use of the "-e" option in this command. And zImage is
not what you want. If you want to use an uncompressed kernel image
this should be something like
mkimage -A arm -O linux -T kernel -C none -a 0x0C008000 \
-e 0x0C008000 -n 'ARM Linux' \
-d arch/arm/boot/compressed/piggy uImage
> The trouble is that it starts executing at 0xc0008000 which is the
> image header.
Why is there trouble? It is OK.
> Based on reading the README, I'm suspicious that I've misconstrued the
> load addresses and that the loader doesn't support uncompressed
> images.
>
> Any tips?
It works fine for me like this:
-> mkimage -A arm -O linux -T kernel -C none -a 0x0C008000\
> -e 0x0C008000 -n 'ARM Linux-2.4.18' \
> -d arch/arm/boot/compressed/piggy /tftpboot/TRAB/uImage-uncompressed
Image Name: ARM Linux-2.4.18
Created: Tue Aug 5 09:04:27 2003
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1930071 Bytes = 1884.83 kB = 1.84 MB
Load Address: 0x0c008000
Entry Point: 0x0c008000
And on the target:
TRAB # tftp c400000 /tftpboot/TRAB/uImage-uncompressed
TRAB # run nfs_args add_net add_misc;bootm
## Booting image at 0c400000 ...
Image Name: ARM Linux-2.4.18
Created: 2003-08-05 7:04:27 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1930071 Bytes = 1.8 MB
Load Address: 0c008000
Entry Point: 0c008000
Verifying Checksum ... OK
OK
Starting kernel ...
Linux version 2.4.18-rmk7 (wd at atlas.denx.de) (gcc version 2.95.4 20010319 (prerelease/franzo/20011204)) #2 Tue Aug 5 09:00:03 MEST 2003
CPU: ARM/CIRRUS Arm920Tsid(wb) revision 0
Machine: S3C2400
On node 0 totalpages: 4096
zone(0): 4096 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/nfs rw nfsroot=192.168.3.1:/opt/eldk/arm_920TDI ethaddr=00:D0:93:00:88:FB ip=192.168.3.68:192.168.3.1::255.255.0.0:trab::off console=ttyS0 panic=1
...
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
I can't say I've ever been lost, but I was bewildered once for three
days. - Daniel Boone (Attributed)
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