Re: Problem booting ("cannot mount root, error = 79")

["Jared D. McNeill" <jmcneill%invisible.ca@localhost>]

Silas Silva wrote:
> Hello all.
>
> I just sup'ed the -current sources, compiled it and tried to replace my
> current system (NetBSD 4.0) following instructions in
> http://www.netbsd.org/docs/current/index.html.
>
> Compilation worked fine, but the kernel stops at the boot, with the
> following error message:
>
> boot device: wd0
> root on wd0a dumps on wd0b
> no file system for wd0b
> cannot mount root, error = 79
> root device (default wd0a):
>
> wd0a is ok, because it works well with 4.0 kernel. I saw that some
> changes were made in src/sys/kern/vfs_subr.c, in the vfs_mountroot()
> function last days.
>
> Does anybody know anything about it? Some critical changes was made that
> I don't know? BTW, is there a list of incompatibility between two NetBSD
> versions?
>
> GENERIC kernel, i386 here.

Hi Silas --

NetBSD/i386 -current GENERIC kernel requires that kernel modules be 
installed; you must have an up-to-date bootloader ('man 8 boot') 
installed and the kernel module for your root filesystem (most likely 
ffs) must be installed in 
/stand/i386/<version>/modules/<filesystem>/<filesystem>.kmod

As NetBSD -current is going through some pretty major changes at the 
moment, you will probably have better luck with NetBSD 5.0_BETA (which 
doesn't have this kernel module requirement).

Hope this helps,
Jared