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Tzuriel
Apprentice
Joined: 01 Jun 2004
Posts: 259
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 Posted: Thu Aug 20, 2015 5:28 am Post subject: BIOS boot using GPT |
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I have an SSD drive w/ a new install on it. I have partitioned it almost like the handbook for the first two partitions. My partitions are setup as:
/dev/sda1 - bootloader, 2M, BIOS boot partition
/dev/sda2 - vfat, 128M, Boot partition
/dev/sda3 - LUKS/LVM, Rest of disk, Root partition
The problem is, the machine I currently have (about 6 yrs old) does not support GPT. But I've been building this install to support GPT because I will move the drive to a new machine w/ GPT support in 1 month.
Should I be able to get this machine w/ a regular BIOS to boot this drive which is setup for GPT? Or make it work w/ minor changes? |
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Keruskerfuerst
Advocate
Joined: 01 Feb 2006
Posts: 2289
Location: near Augsburg, Germany
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| Posted: Thu Aug 20, 2015 12:43 pm Post subject: |
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You should inform about MSDOS partition table.
You can install your system without GPT, when you create less than 8 partitions. |
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Buffoon
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Joined: 17 Jun 2015
Posts: 1369
Location: EU or US
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| Posted: Thu Aug 20, 2015 1:42 pm Post subject: |
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You can boot your GPT disk using BIOS, some crappy BIOS'es require MBR boot flag though, you can have that with GPT, too. There can be protective MBR even on GPT disks.
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frostschutz
Advocate
Joined: 22 Feb 2005
Posts: 2977
Location: Germany
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| Posted: Thu Aug 20, 2015 2:15 pm Post subject: |
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some old bioses expect a bootable flag in the partition table
| Code: | | parted /dev/disk disk_set pmbr_boot on |
| Quote: |
/dev/sda1 - bootloader, 2M, BIOS boot partition
/dev/sda2 - vfat, 128M, Boot partition
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vfat is normally used only for EFI / ESP boot - if you designated sda2 to be esp, that won't work with old bios, you need regular grub with bios boot partition.
if your sda2 is a regular /boot partition that's fine, if you thought you could use esp, that's your problem |
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Logicien
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Joined: 16 Sep 2005
Posts: 1555
Location: Montréal
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| Posted: Fri Aug 21, 2015 6:56 am Post subject: |
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If you don't want to touch your Gpt partionned disk, you can create an independant media like a Usb key, an Sd card or a Cd/Dvd with a bootloader in for Bios mode. Than your Bios will be able to boot that media and the bootloader to load Linux and his initramfs. The rest is done by Linux who can deal with your Gpt disk.
Of course, your Bios must be able to boot one of those medias.
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