Date: Tue, 14 Jun 2016 08:46:24 -0700 From: Russell Haley <russ.haley@gmail.com> To: Ian Lepore <ian@freebsd.org> Cc: Lou Katz <pi@metron.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: A possible solution to booting from another USB stick Message-ID: <CABx9NuRPcdebfae88yQJsgfF0mnnYBBOXeGrtT8nynmhUhut4g@mail.gmail.com> In-Reply-To: <1465864289.1188.140.camel@freebsd.org> References: <20160610071928.GA75585@metron.com> <1465864289.1188.140.camel@freebsd.org>
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On Mon, Jun 13, 2016 at 5:31 PM, Ian Lepore <ian@freebsd.org> wrote: > On Fri, 2016-06-10 at 00:19 -0700, Lou Katz wrote: >> It occurred to me that as long as I had the same version of FreeBSD >> on the >> bootable card and in a USB adapter I could boot normally, then mount >> the system on the adapter card and do a chroot. >> >> A quicky and dirty test indicates that might work for what I want to >> do, >> which is to: >> a. modify an application >> b. add or subtract data files >> and as a freebie, I seem to get >> c. ability to change things without rebooting. >> >> I will report back after I try this in earnest. >> >> Thanks for the feedback. >> > > I apparently missed the first round of this question. > > In uboot, you need to do a "usb start", then do "usb dev" and see if it > recognizes your disk device. If so, you're in business, tell ubldr to > load the kernel from it instead of sdcard by doing: > > setenv loaderdev disk1 > > If there are multiple disks you might need disk2, disk3, whatever. If > there are multiple partitions involved you might need, for example, > disk1:2 to boot from partition 2. So does that mean there are three possible answers? 1) Create a new kernel and set ROOTDEVNAME" options ROOTDEVNAME=\"ufs:mmcsd0s2\" 2) If you have a good image with a kernel and rootfs on USB use a u-boot environment variable: uboot> setenv loaderdev disk1 3) If you can set the loader.conf file and want to run kernel on a default image (sdcard) and rootfs on USB: /boot/loader.conf (on the sd-card root) has vfs.root.mountfrom="ufs:/dev/ufs/bsd11" > -- Ian > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"
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