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Old 2 Weeks Ago
jbgg jbgg is offline
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Default installboot program as script

Hello,

I will brief the reason why I have written a minimal script that does the same work as the program installboot(8) (at least what I needed).

I had compiled the boot(8) for i386, and I was wondering how to test it, but I did not brave enough for testing in the hard disk of my computer (though I used before installboot because I erased /boot once, but this was another story).
So I decided to create a new partition and new file system at a flash memory, after that /boot (new program compiled) was copied at new flash memory file system. I thought that the next step will be easy, just use installboot program, but I did not manage to modify the values that installboot changes to biosboot, because the file system is not the same as the installed system.

After that, I created an script to do it "manually". Of course, I have get the offset of the variables from my biosboot, and maybe in other computer could be different. Anyway, I think sharing the script is profitable.

The script can be found at https://github.com/jbgg/installboot2.

I think this is useful for the community.

Thank you for reading.

All suggestion are welcome.
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Old 2 Weeks Ago
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jggimi jggimi is offline
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Hello and welcome.

The installboot(8) program will write boot blocks to any drive - a separate script is not necessary, though it may have been helpful to you. The -r option of installboot is used to direct installboot to the root directory of the drive, while the biosboot(8) and boot(8) programs stored in /usr/mdec are explicitly defined as the stage1 and stage2 bootloaders to be installed.

For this example, the drive selected is sd7, and a temporary mount point /mnt is used.
  1. Mount the drive's root directory.

    # mount /dev/sd7a /mnt
  2. Change the working directory to /usr/mdec for ease of access to the pathnames for /usr/mdec/biosboot and /usr/mdec/boot.

    # cd /usr/mdec
  3. Issue the installboot(8) command. The -v option may be used to obtain a list of actions taken by installboot().

    # installboot -v -r /mnt sd7 biosboot boot
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Old 2 Weeks Ago
jbgg jbgg is offline
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Thank you for your answer. I forget "-r /mnt" because the disk only had one partition.
I have tested and it works fine.
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