[U-Boot] understanding mkimage a bit more

[Gerhard Pircher <gerhard_pircher@gmx.net>]

-------- Original-Nachricht --------
> Datum: Fri, 6 May 2011 09:24:27 -0700
> Von: Charles Krinke <charles.krinke@gmail.com>
> An: u-boot at lists.denx.de
> Betreff: [U-Boot] understanding mkimage a bit more

> I can create a uImage with mkimage with "-C gzip" and it boots fine.
> If I use "-C none", it hangs on boot with bootm in u-boot. The
> arguments below come directly from the linux-2.6.35.12 kernel which
> creates uImage from vmlinux.bin.gz (which is already compressed, I
> know, but that is a different issue).
> 
> In trying to work through how mkimage, uboot, objdump and objcopy
> interact, my The question becomes "Why does a uImage created with -C
> gzip boot with bootm and a uImage created with -C none hang?"
> 
> In both
> $ scripts/mkuboot.sh -A ppc -O linux -T kernel -C gzip -a 0x00000000
> -e 0x00000000 -n Linux-2.6.35.12-svn438 -d ./vmlinux.bin.gz
> /tftpboot/uImage
> Image Name:   Linux-2.6.35.12-svn438
> Created:      Fri May  6 09:05:42 2011
> Image Type:   PowerPC Linux Kernel Image (gzip compressed)
> Data Size:    1714808 Bytes = 1674.62 kB = 1.64 MB
> Load Address: 0x00000000
> Entry Point:  0x00000000
> 
> $ scripts/mkuboot.sh -A ppc -O linux -T kernel -C none -a 0x00000000
> -e 0x00000000 -n Linux-2.6.35.12-svn438 -d ./vmlinux.bin.gz
> /tftpboot/uImage
> Image Name:   Linux-2.6.35.12-svn438
> Created:      Fri May  6 09:10:31 2011
> Image Type:   PowerPC Linux Kernel Image (uncompressed)
> Data Size:    1714808 Bytes = 1674.62 kB = 1.64 MB
> Load Address: 0x00000000
> Entry Point:  0x00000000
> ckrinke at hwa:~/svn/trunk/linux-2.6.35.12$
> ckrinke at hwa:~/svn/trunk/linux-2.6.35.12$

You wrap a compressed kernel image in an uImage that is marked as
'uncompressed'. Thus U-Boot doesn't decompress the uImage and tries
to directly execute the gzipped data. Decompress vmlinux.bin.gz with
"gzip -d" before converting it with mkuboot.sh and it should work.

regards,
Gerhard
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