[PATCH 1/4] fs/squashfs: new filesystem

[Thomas Petazzoni]

Hello Rasmus,

On Thu, 9 Jul 2020 21:50:03 +0200
Rasmus Villemoes <rasmus.villemoes at prevas.dk> wrote:

> > +config SPL_FS_SQUASHFS
> > +	bool "Support SquashFS filesystems"
> > +	select FS_SQUASHFS  
> 
> Is there any reason U-Boot proper must support squashfs if the SPL does?
> This isn't quite specific to this patch; I see a number of 'config
> SPL_FOO' that either depends on or selects FOO (e.g. SPL_FS_FAT), and I
> wonder why.

Well, if your Linux kernel image and Device Tree are stored in a
squashfs filesystem, then U-Boot proper needs SquashFS support, right ?

And that is completely independent of whether the SPL has SquashFS
support to be able to load U-Boot proper (which potentially could be
stored on SquashFS as well).

It's very much like the FAT filesystem case: if you have U-Boot proper
and your Linux kernel image in a FAT filesystem, then the SPL needs FAT
filesystem support to load U-Boot proper, and U-Boot proper needs FAT
filesystem support to load the Linux kernel image.

Am I missing something here ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com