Re: Boot Loader Issue
On Sun, 23 Jun 2013, Doug Hardie wrote: On 23 June 2013, at 20:39, Warren Block wbl...@wonkity.com wrote: On Sun, 23 Jun 2013, Doug Hardie wrote: I had to convert a system from GPT to MBR. All went fine till I tried to reboot the system. It gets to mountroot and dies trying to mount from ufs:/dev/ada0p2. That won't work. The loader should be getting that information from /etc/fstab. Have the entries there been changed? That was the problem. The system used GPT before and I can't believe I forgot to update fstab. That was a really dumb mistake. Not really, the only reason it occurred to me was because I've forgotten to do it many, many times. As Polytropon points out, labels can help avoid the problem. In this case, it would have had to be a UFS label on the filesystem: http://www.wonkity.com/~wblock/docs/html/labels.html ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Sun, 23 Jun 2013 15:47:53 -0700, Doug Hardie wrote: I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. You need to install the GPT boot code, e. g. # gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ad0 # gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ad0 See http://www.wonkity.com/~wblock/docs/html/disksetup.html for details. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Sun, Jun 23, 2013 at 4:12 PM, Polytropon free...@edvax.de wrote: On Sun, 23 Jun 2013 15:47:53 -0700, Doug Hardie wrote: I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. You need to install the GPT boot code, e. g. # gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ad0 Why the offset? Why 512k? # gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ad0 I think it's simpler to make an entry in /boot/loader.conf: vfs.root.mountfrom=ufs:/dev/ada0s1a ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Sun, 23 Jun 2013, Doug Hardie wrote: I had to convert a system from GPT to MBR. All went fine till I tried to reboot the system. It gets to mountroot and dies trying to mount from ufs:/dev/ada0p2. That won't work. The loader should be getting that information from /etc/fstab. Have the entries there been changed? If I enter ufs:/dev/ada0s1a then the system boots fine and runs. I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/boot-blocks.html has some information. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Mon, 24 Jun 2013, Polytropon wrote: On Sun, 23 Jun 2013 15:47:53 -0700, Doug Hardie wrote: I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. You need to install the GPT boot code, e. g. # gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ad0 # gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ad0 See http://www.wonkity.com/~wblock/docs/html/disksetup.html for details. That is GPT bootcode, but he was switching to MBR. That is documented in the second half of the link. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Sun, 23 Jun 2013, Michael Sierchio wrote: On Sun, Jun 23, 2013 at 4:12 PM, Polytropon free...@edvax.de wrote: On Sun, 23 Jun 2013 15:47:53 -0700, Doug Hardie wrote: I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. You need to install the GPT boot code, e. g. # gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ad0 Why the offset? Why 512k? Block 40 is the first 4K-aligned block after the 32 blocks occupied by the GPT. It won't hurt anything if the drive is not a 4K Advanced Format drive, won't really make a big difference if it is since bootcode is not really disk I/O-limited. Just good practice to keep everything aligned. 512K is the largest size of bootcode that will work. The loader loads the whole partition regardless of how large the bootcode is, and will fail with larger sizes. It's no loss of space because the first UFS partition will start at 1M. Why 1M? Because it's an unofficial standard, and aligned with 4K, 8K, 128K, and so on. This article talks about it a bit more: http://www.wonkity.com/~wblock/docs/html/ssd.html # gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ad0 I think it's simpler to make an entry in /boot/loader.conf: vfs.root.mountfrom=ufs:/dev/ada0s1a These are different things. The command is for a GPT disk, and the boot device being set is for MBR. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On 23 June 2013, at 20:39, Warren Block wbl...@wonkity.com wrote: On Sun, 23 Jun 2013, Doug Hardie wrote: I had to convert a system from GPT to MBR. All went fine till I tried to reboot the system. It gets to mountroot and dies trying to mount from ufs:/dev/ada0p2. That won't work. The loader should be getting that information from /etc/fstab. Have the entries there been changed? That was the problem. The system used GPT before and I can't believe I forgot to update fstab. That was a really dumb mistake. Thanks very much. If I enter ufs:/dev/ada0s1a then the system boots fine and runs. I need to alter mountroot so it tries the right partition/slice. How do I do that? I couldn't find anything in the handbook on that. http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/boot-blocks.html has some information. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Boot Loader Issue
On Sun, 23 Jun 2013 21:35:20 -0700, Doug Hardie wrote: On 23 June 2013, at 20:39, Warren Block wbl...@wonkity.com wrote: The loader should be getting that information from /etc/fstab. Have the entries there been changed? That was the problem. The system used GPT before and I can't believe I forgot to update fstab. That was a really dumb mistake. Thanks very much. If you can use labels instead of device names, this problem can be avoided. :-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
