In message 20030805020001.GA15284@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@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