Probably more a question for @bodhi than anyone, but any advise welcomed :)

My question is what file systems can the current 2016.05 Uboot boot ?

ext2 / ext3 - I know from my own experience work fine, although ext2 is a bit fragile with the lack of journal, so have preferred ext3

ext4 ? (says so on the post)

mdadm RAID 1 with 1.0 metadata / 0.9 metadata ... other RAID levels ? 1.2 metadata ?

f2fs ?

are my main contenders, and just for good measure :

btrfs ?

zfs ? (probably a no go on low memory ARM boards anyway)

EDIT: obviously I mean what fs can Uboot load kernel/device tree and initramfs from, sorry if that wasn't clear :)

Don Charisma ... because anything is possible with Charisma

My blog - http://DonCharisma.org
Our commercial site - http://DonCharisma.com



Edited 1 time(s). Last edit at 05/20/2017 08:42AM by DonCharisma.

Hi Don,

> My question is what file systems can the current 2
> 016.05 Uboot boot ?

ext2, ext3, ext4 without any extra works.

>
> mdadm RAID 1 with 1.0 metadata / 0.9 metadata ...
> other RAID levels ? 1.2 metadata ?

Yes, with initramfs (i.e. uInird). IIRC, md is currently a module, so you need to update initramfs-tools to load it early (and then regenerate uInitrd).

>
> f2fs ?
>

Yes, but only rootfs. The kernel files uImage and uInitrd still needed to be on a ext2/ext3/ext4 partition.

> btrfs ?

Same as md.

> zfs ? (probably a no go on low memory ARM boards a
> nyway)

No, not with these low RAM plugs.

-bodhi
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Thanks @bodhi,

Would I be safe in assuming with md arrays using mdadm (and btrfs), that I would have to have a separate /boot partition, of ext2/3/4 ?

Don Charisma ... because anything is possible with Charisma

My blog - http://DonCharisma.org
Our commercial site - http://DonCharisma.com

Don,

> Would I be safe in assuming with md arrays using m
> dadm (and btrfs), that I would have to have a sepa
> rate /boot partition, of ext2/3/4 ?

No need to have separate partition. Just a normal rootfs. But you will need to ensure the md module and btfs module loaded early during kernel booting.

-bodhi
===========================
Forum Wiki
bodhi's corner

bodhi Wrote:
-------------------------------------------------------
> Don,
>
> > Would I be safe in assuming with md arrays using
> m
> > dadm (and btrfs), that I would have to have a se
> pa
> > rate /boot partition, of ext2/3/4 ?
>
> No need to have separate partition. Just a normal
> rootfs. But you will need to ensure the md module
> and btfs module loaded early during kernel booting
> .

understood, TVM :)

Don Charisma ... because anything is possible with Charisma

My blog - http://DonCharisma.org
Our commercial site - http://DonCharisma.com