Date: Sat, 15 Dec 2001 04:14:42 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Hiten Pandya <hitmaster2k@yahoo.com> Cc: hackers@freebsd.org Subject: Re: boot0 Message-ID: <3C1B3EB2.E6D1F0C0@mindspring.com> References: <20011215092344.54636.qmail@web21110.mail.yahoo.com>
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Hiten Pandya wrote: > I found this piece of code in boot0.s, is it possible > if you could explain me a bit about it. > > .set NHRDRV,0x475 # Number of hard drives > > The hex value comes out to: 1141. > > Does that mean, that this is the amound of maximum > hard drives a user can have on FreeBSD? No. The BIOS bootstrap loaded passes the boot drive in the %DL; this gets pushed, and later poped for the byt compare; the compare is based on a storage location of a relative offset. Frankly, you don't need to understand this code if you are trying to get the boot loader to understand JFS; instead you want to add JFS support into boot1/2 via libstand in /usr/src/lib/libstand. See /usr/src/lib/libstand/ufs.c, and look at how the library is able to select the routines in ufs.c vs. cd9660.c. If you are serious about this, handle read-only non-root JFS mounts of Linux created disks, first, and then work up to read/write, root mount, and then booting (in that order). -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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