Date: Fri, 14 Aug 1998 06:43:21 +0800 From: Peter Wemm <peter@netplex.com.au> To: Mike Smith <mike@smith.net.au> Cc: zhihuizhang <bf20761@binghamton.edu>, hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Questions about MFS_ROOT and MFS_AUTOLOAD Message-ID: <199808132243.GAA17404@spinner.netplex.com.au> In-Reply-To: Your message of "Sat, 08 Aug 1998 15:11:31 MST." <199808082211.PAA02183@antipodes.cdrom.com>
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Mike Smith wrote: > > > > Hi, I have two questions about MFS: > > > > (1) Does option MFS_ROOT mean that the memory file system will be the root > > of the entire file system hierarchy (all other disk-based file systems, if > > any, hang off the memory-based file system)? > > It means that the kernel-internal MFS will be mounted as /. If your > startup code in that filesystem mounts others, then they will be hung > off the MFS, yes. > > > (2) How can the MFS image be made separately from the other part of the > > kernel? This is required by MFS_AUTOLOAD. > > Use 'dd' to create a file of the appropriate size, then 'vnconfig' to > attach it to a 'vn' device, then newfs it and install stuff as desired. > Have a look at the way that the src/release makefile does it as it > builds the MFS for the install kernel. MFS_AUTOLOAD is a variation on the MFS_ROOT system. It was meant as an option for loading a floppy into the mfs ramdisk after the kernel had started. This is leftover from attempts to get it to install a 4MB system, at the expense of using two boot disks instead of one. > -- > \\ Sometimes you're ahead, \\ Mike Smith > \\ sometimes you're behind. \\ mike@smith.net.au > \\ The race is long, and in the \\ msmith@freebsd.org > \\ end it's only with yourself. \\ msmith@cdrom.com > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > Cheers, -Peter -- Peter Wemm <peter@netplex.com.au> Netplex Consulting To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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