Date: Wed, 18 Mar 2009 09:23:01 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-geom@freebsd.org Subject: Re: gpart bootcode and /boot/boot Message-ID: <0B27FB91-9F2B-4F96-B4A0-330CAD725AF1@mac.com> In-Reply-To: <49C11880.8000506@freebsd.org> References: <4978C24D.9040706@icyb.net.ua> <49A6C33E.70402@freebsd.org> <EE8C5392-A907-4C75-BEB4-125C30AA6D41@mac.com> <49C11880.8000506@freebsd.org>
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On Mar 18, 2009, at 8:51 AM, Andriy Gapon wrote: > on 26/02/2009 18:54 Marcel Moolenaar said the following: >> >> On Feb 26, 2009, at 8:28 AM, Andriy Gapon wrote: >> >>> on 22/01/2009 21:00 Andriy Gapon said the following: >>>> Sorry for being lazy - what is "gpart bootcode" equivalent of >>>> bsdlabel >>>> -B [-b boot] ? >>>> >>> >>> Marcel, guys, I am still curious. >>> >>> disklabel -B refuses do to anything because of what it thinks is >>> incorrect >>> partition info. >>> >>> And the following command gets "Operation not permitted" when it >>> opens >>> ad6s1 for >>> writing: >>> gpart bootcode -p /boot/boot -i 1 ad6 >> >> Don't you mean "gpart bootcode -b /boot/boot ad6s1" >> >> If you say "-i 1 ad6", then what you want is bootcode >> in a partition that is controlled by the scheme on ad6 >> (the scheme on ad6 is the MBR). You can't do that, >> because that partition is sub-partitioned by the BSD >> scheme. >> >> Since you want bootcode in the BSD scheme, you need >> to add bootcode to ad6s1. > > > Thank you very much for the explanation! > >>> >>> This is amd64, stable/7, gpart-only kernel (gpart_mbr, gpart_bsd). >> >> Bootcode for the BSD scheme is not present in 7-STABLE yet. >> I just recently added that to -CURRENT (I must have missed >> it) and I need to get around MFCing it. Feel free to do the >> MFC for me. The code has been in -CURRENT long enough to do >> a MFC. > > Thank you for the offer and sorry that I haven't used the opportunity. > And thank you for the MFC - I am using the code in stable/7 and > successfully > updated boot2 blocks via the command you suggested. > Just for the record - I did it to use jhb's fix for real<->protected > switch in > boot code. > > BTW, is there a way to read/backup bootcode (for BSD scheme)? There's no gpart function for it yet, but you can use dd as a work-around. Unfortunately, that means you need to know how much to read: MBR: 1 sector (512B) starting at 0 BSD: 16 sectors (8KB) starting at 0 These raw dumps can be restored using gpart: gpart bootcode -b $mbr.dd ad6 gpart bootcode -b $bsd.dd ad6s1 No, it will not destroy any partitioning data :-) -- Marcel Moolenaar xcllnt@mac.com
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