Date: Wed, 27 Aug 2014 20:33:40 +0800 (CST) From: huoyingyangjie <huoyingyangjie@163.com> To: freebsd-questions@freebsd.org Subject: kgdb can't debug loadable model,need Experts Message-ID: <48cdc013.de68.14817750ca5.Coremail.huoyingyangjie@163.com>
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McCormick" <martin@server1.shellworld.net> Message-Id: <20140827142517.CF67A228B7@server1.shellworld.net> X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>; List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 27 Aug 2014 14:25:19 -0000 I have been asking lots of questions recently about whether the procedure for building a custom FreeBSD installation CD has changed and it apparently has not but the problem I am having is not hard to define. The original image downloaded from freebsd.org is: FreeBSD-9.1-RELEASE-amd64-disc1.iso and it is 718862336 bytes large. I mounted it on a FreeBSD9 system as follows: ##Set up memory disk. # mdconfig -f FreeBSD-9.1-RELEASE-amd64-disc1.iso -u 1 ##Mount it. #mount -t cd9660 /dev/md1 /mnt2 Everything looks normal if you ls /mnt2. If one was to use mkisofs with /mnt2 as the top of the tree, a new iso image file should appear somewhere that is about the same size as the starting ISO file. As a test to see if this happens, I did the following: # mkisofs -J -R -V customBSD -no-emul-boot -b boot/cdboot -iso-level 3 -o \ #/home/martin/tmp/serialcd64.iso . #ls -l /home/martin/serialcd64.iso -rw-r--r-- 1 root martin 833892352 Aug 26 10:48 serialcd64.iso Man! I sure wish my pay check could do that after a week of living. I know that hard links will make tar and rsync produce larger outputs if not called correctly. My understanding is that hard links are multiple sets of inode numbers pointing to the same files so they are hard to mechanically distinguish from actual disk space being occupied by the same data in more than one spot. When one needs to make a custom CD, the extremely difficult part is recreating the steps that were used to originally build the image. An amusing side note; I used rsync to create a writable copy of the tree as follows: #cd ./treetop #sudo rsync -a /mnt2/ ./ A few seconds later, I had something that built without a single complaint so I made an image out of treetop and got: #ls -l custom* -rw-r--r-- 1 martin martin 455213056 Aug 26 11:42 custom.iso That was the exact same file tree that insists on being 120 MB too large if you try to make a straight ISO image from the mounted file system of the original image which is about 300 MB larger than this one. That has been pretty much the story of the last few days and I am running out of things to try. The process for building the FreeBSD installation CD is clever since it manages to cram so much in to the limited space without compressing the entire image. So far, orthogonalness has escaped me at every turn. Martin McCormick
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