On Wed, Mar 30, 2016 at 11:15 AM, Joachim Eastwood <manabian@xxxxxxxxx> wrote: > Hi Mark, > > On 30 March 2016 at 15:41, Mark Rutland <mark.rutland@xxxxxxx> wrote: >> On Wed, Mar 30, 2016 at 04:06:56PM +0300, Vladimir Zapolskiy wrote: >>> On 30.03.2016 14:06, Mark Rutland wrote: >>> > On Wed, Mar 30, 2016 at 12:30:41AM +0200, Joachim Eastwood wrote: >>> >> Add unit name to memory to remove the following warning: >>> >> Warning (unit_address_vs_reg): Node /memory has a reg or ranges >>> >> property, but no unit name >>> > >>> > If anything, it would be better to get rid of the memory node from the >>> > skeleton DTs. >>> > >>> > For DTs which have a memory node there's no problem, and DTs which >>> > expect a bootlaoder to fill things in have a logical place to document >>> > that fact. >> >>> The only problem I see if DTB is updated on a board but a board bootloader >>> on fix-up is capable to fill a preexisting "/memory" device node in only, >>> otherwise it is not clear why the device node is present in skeleton.dtsi. >> >> Sure. To clarify the above, what I expect that for this case is that the >> empty memory node would exist in the dts for that particular board, >> along with a comment, e.g. >> >> /* The firmware/bootloader for $BOARD fills this in */ >> memory { >> device_type = "memory"; >> reg = <0 0 0 0>; >> }; > > To avoid the warning with the new dtc this would need to be memory@0. Except memory is probably not actually at 0 here. This has come up before and been beaten to death. Bottom line is plain "memory" is allowed, and I plan to add that exception to dtc. >> That way you can tell at a glance that the lack of memory information in >> the DT for a board is intentional, and the bootloader still gets the >> node it expects. > > > But this doesn't seem to be a "problem" with any of the DTs in > arch/arm/boot as they all defined a memory node. > > I used the following script to check for the memory node in all built dtb's. > make ARCH=arm CONFIG_OF_ALL_DTBS=y dtbs > for i in $(ls arch/arm/boot/dts/*.dtb); do > m=$(scripts/dtc/dtc -I dtb -O dts $i | grep -m1 'memory.*{') > if [ -z "$m" ]; then > echo "Missing memory node in $i" > fi > done > > So it should be pretty safe to just remove the memory node entry in > the skeleton files. Unless I have missed something with the script > above. You've got to make sure they have 'device_type = "memory";' which they could rely on inheriting. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html