Grub Bios Boot filesystem description

Grub Bios Boot filesystem description

[znavko]

Hello! If I want to part my disk and to use 3 partitions:
1) Bios Grub,
2) Linux filesystem, and
3) Linux Swap
should I describe my Bios Grub filesystem in '(operating-system (file-systems (list ...)))' or just only in '(operating-system (bootloader ...))' section?

If I need to describe grub file system, so which type should I specify?

If I do not need, how grub will know to boot from my root partition Linux filesystem on /dev/sdb2 ?

Re: Grub Bios Boot filesystem description

[znavko]

This is my config, that does not contain item for /dev/sdb1 file system that is for bios grub: https://termbin.com/t2pr
Will it work fine?

May 26, 2019 12:27 PM, znavko@disroot.org wrote:

> Hello! If I want to part my disk and to use 3 partitions:
> 1) Bios Grub,
> 2) Linux filesystem, and
> 3) Linux Swap
> should I describe my Bios Grub filesystem in '(operating-system (file-systems (list ...)))' or just
> only in '(operating-system (bootloader ...))' section?
> 
> If I need to describe grub file system, so which type should I specify?
> 
> If I do not need, how grub will know to boot from my root partition Linux filesystem on /dev/sdb2 ?

Re: Grub Bios Boot filesystem description

[Raghav Gururajan]

> should I describe my Bios Grub filesystem in '(operating-system (file-systems (list ...)))' or just
> only in '(operating-system (bootloader ...))' section?

You do not need to mention grub in "file-system" section of config. You have to mention just the device "sdX" NOT with the partition "sdXY", in the "boot-loader" section of the config. Assuming the device is formatted as GPT, you should have either "BIOS Boot Partition" (for BIOS systems) or "EFI Boot Partition" (for UEFI systems) on the device. In the "boot-loader" section of config; if you use "grub-bootloader", it will detect the BIOS Boot Partition and install grub on it (or) if you use "grub-efi-bootloader", it will detect the EFI Boot Partition and install grub on it.

> If I need to describe grub file system, so which type should I specify?

No need. See the above.

> If I do not need, how grub will know to boot from my root partition Linux filesystem on /dev/sdb2 ?

The grub uses file-system drivers to detect file-systems and look for grub.cfg. As the grub.cfg (in /boot/grub of /dev/sdX2) was generated by guix based on the config file, it has information where to look for kernel.

Regards,
RG.

Re: Grub Bios Boot filesystem description

[Raghav Gururajan]

> This is my config, that does not contain item for /dev/sdb1 file system that is for bios grub:
> https://termbin.com/t2pr
> Will it work fine?

It appears you are using "grub-bootloader". Assuming you used GPT, just make sure the partition sdb1 was created/formatted as "BIOS Boot Partition".

Regards,
RG.

Re: Grub Bios Boot filesystem description

[Tobias Geerinckx-Rice]

[-- Attachment #1: Type: text/plain, Size: 399 bytes --]

znavko@disroot.org wrote:
> Hello! If I want to part my disk and to use 3 partitions:
> 1) Bios Grub,
> 2) Linux filesystem, and
> 3) Linux Swap
> should I describe my Bios Grub filesystem

Nitpick: it's not a file system, just some reserved raw sectors 
for GRUB.  GNU/Linux (ergo Guix) can't read from (or do anything 
else with) it, so you don't need to tell them about it.

Kind regards,

T G-R

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 227 bytes --]