Date: Tue, 29 Sep 2015 08:08:36 +0300 From: Jukka Ukkonen <jau789@gmail.com> To: freebsd-arm@FreeBSD.org Subject: Root mount on arm Message-ID: <560A1CD4.9030600@gmail.com>
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Hello all, Is there something different in how various actions are ordered at boot time on ARM and other architectures? In particular is there a difference in when and how the root file system gets mounted? On 10-stable I have been using a patch which allows the stat() calls to report the true media size of a block device, the true block count, and true block size for device entries. The whole thing only requires a few more extra lines in devfs_getattr(). Find the patch here... https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197876 Without the patch the media size and the block count are reported by stat() as zero, and the block size comes out as 4k for all devices no matter what the actual block size is. The original setup has been much like yet another Volkswagen cheating during the inspection. The patch has worked just fine independent of the architecture. During the last few months I have been using this modification on amd64 and ppc only, though. When I decided to test the same modification on arm I used 11-current instead of 10-stable. To my surprise the boot was interrupted with a complaint that the SD card device from which the root file system should have been mounted was locked/held by some other part of the kernel. Apparently this unexpected reaction was triggered by g_topology_assert() which is called from within g_dev_getprovider(). Now I am not quite sure whether this happens only on arm or is it 11-current in general. I will be able to test with 11-current on another architecture only after a week from now or so. Because I cannot do anything else to solve this mystery at the time I decided to try the swarm intelligence. Maybe someone on the list remembers the details of boot time actions on arm well enough to tell whether the interrupted boot could be due to some arm specific differences in how things are ordered during the boot. Cheers, --jau
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