Many thanks Jing!!! I've already added a comment in the troubleshooting
guide:

http://wiki.systemimager.org/index.php/Troubleshooting#Ramdisk_too_small.3F_Getting_errors.3F

and I've also added a note directly in the syslinux.cfg comments.

-Andrea

Jing CDL Sun wrote:
> Hi,
> 
> I use SIS v3.7.4 to install RedHatEL5, but after the target node got the
> kernel and initrd(generated by si_prepareclient)
> I ran into the same problem :
> 
> md: Autodetecting RAID arrays.
> md: autorun ...
> md: ... autorun DONE.
> RAMDISK: Compres iso_blknum=17, block=-2147483648
> No filesystem could mount root, tried: ext2 iso9660
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(1,0)
> 
> I have found a solution to fix this problem, hope to be helpful for you
> too:)
> it is to add a parameter to the kernel boot options, something like this
> "ramdisk_blocksize=1024",
> because it is the ramdisk block size of the initrd.img we got from the
> golden client.
> and it seems that if we do not indicate this parameter in the boot
> options ,then it can not be recognized.
> 
> I have verified this solution and it works well.
> 
> I'd like to share it with all the SIS users, because I have got a lot of
> help here, thank you all.
> 

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