Date: Wed, 31 Mar 2010 11:53:24 +0800 From: Fbsd1 <fbsd1@a1poweruser.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: /boot.config Message-ID: <4BB2C734.1070301@a1poweruser.com> In-Reply-To: <20100330151708.GA16258@dan.emsphone.com> References: <4BB19257.6020108@a1poweruser.com> <20100330151708.GA16258@dan.emsphone.com>
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Dan Nelson wrote: > In the last episode (Mar 30), Fbsd1 said: >> During the boot process I want to change the device used to boot from. >> From the default 0:ad(0,a)/boot/loader >> to 0:da(0,a)/boot/loader forcing the boot to continue from usb stick. >> >> Here is the problem, the bios have no option to boot from USB device. So >> thinking let the bios point to first drive to start the boot process and >> have a /boot.config file to redirect to booting from the USB stick. I am >> assuming the '0' zero will mean the first USB device. >> >> Is there any command i can use to verify the single USB stick is the 0 >> device? > > If you boot DOS from a floppy, can you see the USB stick as B: or C: ? If > not, then the BIOS probably has no USB support at all, and you'll need to > put a small boot partition somewhere on your hard drive to pull the kernel > from. 128MB is large enough for a /boot directory, and you can set > vfs.root.mountfrom="ufs:/dev/da0s1a" in loader.conf to make it mount its > root filesystem from the USB stick (since at that point the kernel has > loaded its own USB drivers). > > If you do see the USB drive from a DOS boot floppy, try entering > "1:da(0,a)?" at the boot block prompt and see if it lists the files in your > USB filesystem. If it does, then "1:da(0,a)/boot/loader" should let you > boot FreeBSD. > The USB stick is plugged in before booting. During boot I select option 6 from Freebsd menu to go direct to the loader prompt. I have ok on command line. I enter vfs.root.mountfrom="ufs:/dev/da0s1a" and get "not found" after hitting enter key. At the ok prompt I enter ? for list of available boot devices and only have ad0 listed. It seems the da0 device USB stick is not recognized yet.home | help
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