loaderdev

[Balanga Bar]

I wondered about FreeBSD being able to access uBoot environment
variables... fw_printenv and fw_setenv are available on Linux, so are
equivalent programs available on FreeBSD?

On Thu, Apr 18, 2019 at 3:25 PM Ian Lepore <ian at freebsd.org> wrote:

> On Thu, 2019-04-18 at 09:30 +0100, Balanga Bar wrote:
> > How does uBoot know how to load ubldr? Is this specific to a particular
> > version of uBoot? I'm using a customised uBoot which lets me boot
> OpenWrt,
> > Debian, Arch Linux or FreeBSD depending on the contents of a USB stick.
> >
> > Currently I have a /boot/uEnv.txt file on a FAT partition which includes
> >
> > bootfile=ubldr
> >
> > Will I no longer need a FAT partition?
> >
> > If loaderdev is set to disk, then where is ubldr loaded from since,
> AFAIK,
> > uBoot can only read FAT or EXT3 partitions?
> >
>
> The convention for freebsd mailing lists is to bottom-post replies,
> mixed top and bottom posting makes for unreadable threads.
>
> The loaderdev variable is not used by uboot at all, it is read from the
> uboot environment by ubldr.  Basically, loaderdev just gives you a way
> to control where ubldr finds the kernel by setting a uboot env var
> (interactively or via uenv.txt).
>
> You arrange to have uboot load ubldr in whatever way you're currently
> doing, so you will still need a FAT partition, because uboot can't read
> UFS filesystems.
>
> -- Ian
>
>