On Tue, Oct 16, 2012 at 6:25 AM, Peter Robinson <pbrobinson@xxxxxxxxx> wrote: >> Made good progress today. :) >> Was able to get Device Tree to work on both Panda ES and Trimslice. > > Awesome! > >> What works: appended DTB kernels. (cat the .dtb to the end of the >> zimage, then generate a new uImage) >> >> What does NOT work: loading the .dtb from u-boot (similar to the initrd) > > It's a good start. > >> One notable breakthrough was being able to boot the trimslice with the >> latest version of u-boot. >> (had to change boot.cmd to have root=/dev/mmcblk0p3) > > OK, interesting to see why labels don't work. > >> For the panda it would seem not all the parts of omap kernel are moved >> over to DT, some things do not work. > > Not surprised as I believe 3.7 should be the end of the OMAP DT > support additions but it's good to know it actually works which is my > primary concern so that we know it has all the bits needed in F-18. > > Peter A few things to discuss: * update u-boot in f18 to 2012-10 (important for panda) -> Apparently we only bundle u-boot with omap anyways. -> The updated version only appears for f19, this would be a "nice to have" type thing for f18. -> Only the updated version loads the .dtb succesfully from u-boot, otherwise we can append the .dtb in 2012-07. * Do we even want to load the .dtb for panda? -> my experience was not happy, the omap4-panda.dtb makes things break. -> Breaks: WiFi, Display Subsystem and maybe USB-Host functionality. -> I do believe the omap folks are busy working on improving DT, so maybe we can wait? * Trimslice -> was able to get mmc/sdcard booting with the latest DT-enabled u-boot. -> unfortunately when Brendan ran into a snag when reproducing with his internal /dev/sda boot. -> on the trimslice the .dtb seems to have to be appended, so far loading via u-boot is not happy. -> also there is a rumor that trimslice might support a uEnv.txt type thing, would be nice to have. * adding the .dtb's to the distro. -> I hear the .dtb files are somehow generated from the kernel sources? -> sometimes we may have to append them to the kernel zimage (trimslice). -> Other times they get loaded via u-boot (Panda). -> Would be interesting to findout how our image generation process deals with this. -> necessary first step is deciding how we get access to the .dtbs from the distro. -- -Jon _______________________________________________ arm mailing list arm@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/arm
