On 08/05/2013 03:41 PM, Dennis Gilmore wrote:
> Hi all,
>
> As part of the unified features in u-boot thread I said that I
> would work to get distros to agree to a common location that u-boot
> will be able to assume exists for it to transparently load dtbs
> from for us.
>
> I would like to propose /boot/dtb/
>
> I think it needs to be in /boot/ to allow for booting from systems
> with / and /boot on separate partitions. I believe Ubuntu and
> hence Debian put them in /lib somewhere today. Fedora puts them in
> /boot/dtb-<kernel version>. im not sure where the other distros
> put them.
>
> I think that until they are decoupled from the kernel Fedora would
> have /boot/dtb be a symlink to the latest installed kernel. once
> its decoupled it would be the location where the dtbs are
> installed.
A symlink-to-the-latest-version doesn't seem that useful. If DTBs are
tied to a particular kernel version (and in many cases they are
today), then bootloaders/... will *have* to access
/boot/dtb-${kernel_version} in order to pick up the correct DTB. As
such, /boot/dtb itself won't ever be used.
Related, all of this pre-supposes that the DTBs are stored in the
filesystem and installed via distro packages. On some systems
(Calxeda?), I believe they're provided by firmware (i.e. are stored in
flash), so are already in memory by the time e.g. U-Boot runs, and
hence have no disk location.
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