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bug#25602: [parted] Problem with msdos mbr creation
From: |
Brian C. Lane |
Subject: |
bug#25602: [parted] Problem with msdos mbr creation |
Date: |
Wed, 1 Feb 2017 15:33:52 -0800 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, Feb 01, 2017 at 11:28:03AM +0100, Lukasz Majewski wrote:
> Dear All,
>
> My parted version is 3.2. OS: Linux GNU Debian 8.6
>
> For one of my embedded systems (arm based one) I do use parted to create
> bootable SD card.
>
> parted -s $DRIVE mklabel msdos
>
> First, I do clean up the first 1MiB of SD card:
>
> dd if=/dev/zero of=$DRIVE bs=1024 count=1024
>
> The problem is that parted is generating following code from the very
> beginning of the MBR:
>
> 00000000 FA B8 00 10 8E D0 BC 00 B0 B8 00 00 8E D8 8E C0
> 00000010 FB BE 00 7C BF 00 06 B9 00 02 F3 A4 EA 21 06 00
> 00000020 00 BE BE 07 38 04 75 0B 83 C6 10 81 FE FE 07 75
> 00000030 F3 EB 16 B4 02 B0 01 BB 00 7C B2 80 8A 74 01 8B
>
>
> What is the purpose of this code? Why is has been put there?
>
> Such data in this place fools the ROM bootloader and hangs the board.
>
> Also, fdisk (from util-linux 2.25.2) when is creating "dos" partition
> table is not writing such data.
That's the MBR boot code normally used to boot a BIOS system. If it
causes problems on a non-x86 system you should zero it out (or write the
system bootloader after partitioning).
--
Brian C. Lane (PST8PDT)