Date: Tue, 13 Nov 2018 22:15:15 +0000 From: bugzilla-noreply@freebsd.org To: standards@FreeBSD.org Subject: [Bug 233211] [boot] [image] 11.2-RELEASE freezes Gigabyte motherboard Message-ID: <bug-233211-99@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233211 Bug ID: 233211 Summary: [boot] [image] 11.2-RELEASE freezes Gigabyte motherboard Product: Base System Version: 11.2-RELEASE Hardware: amd64 OS: Any Status: New Keywords: crash, easy, install, standards Severity: Affects Some People Priority: --- Component: standards Assignee: standards@FreeBSD.org Reporter: rodrigo.freebsd@minasambiente.com.br CC: bcran@FreeBSD.org, kevans@freebsd.org OVERVIEW: FreeBSD-11.2-RELEASE-amd64-memstick.img causes computer to freeze until rearranging installation media MBR and partition alignment on Gygabyte motherboard GA-G41M-ES2L STEPS TO REPRODUCE: Using various USB sticks with various different BIOS configurations (USB 1.0/2.0 Enable/Disable | Legacy USB Support Enable/Disable etc), tested with 6 different vendor/sizes USB sticks with same result: Computer freezes right after BIOS memory check at initial stages. Same USB sticks works if loaded with different content (e.g. GRUB from other OSes). STEPS TO FIX THE ISSUE: It seems that realigning the partitions to MiB boundaries fixed the freezing issue. The original FreeBSD-11.2-RELEASE-amd64-memstick has the EFI partition starting at sector 1, right after MBR data. The following steps resulted in a fix for the situation: - Backing up MBR, EFI and BOOT partitions from actual USB stick loaded with the image. - Wipe USB stick with zeros - Restore MBR from backup - Delete actual partitions as pointed in MBR using fdisk on linux - Recreate the EFI and BOOT partitions using linux fdisk with exact same total sector size as in the original image and same partition ID types - Restoring EFI and BOOT partition data from backup to the newly created ones After this procedure the EFI partition starts at sector 2048 and no more at sector 1. Now aligned to MiB as this is a standard in recent linux fdisk program CONSIDERATIONS: Although I’m not an expert in the subject what I think is (and I may be wrong on these): - The EFI partition starting at sector 1 seems like an exotic alignment (or not really aligned to expected usual page sizes) - Using usual/recommended partition alignment can avoid compatibility issues by avoiding uncommon situations (not tested at product development cycle, e.g. tested only with expected page sizes or even hardware being unable to load very different page sizes from BIOS) - Sector 1 is expected to be used by GPT in GPT scheme, keeping that space free of use for other purposes seems to be a good call, for compatibility reasons. -- You are receiving this mail because: You are the assignee for the bug.help
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