With 1.2 M4, there is not dtb file in http://autobuilder.pokylinux.org/nightly/20120328-1/machines/mpc8315e-rdb/ The dtb file for mpc8315e-rdb should be copied to the sharing directory.
No dtd file is being generated. If one does get generated then it will be copied: pokybuild@autobuilder05:~/yocto-autobuilder/yocto-slave/nightly-ppc/build/build/tmp/deploy/images> ls -al |grep mpc -rw-r--r-- 1 pokybuild users 278745859 Mar 28 16:40 core-image-lsb-qt3-mpc8315e-rdb-20120328232200.rootfs.tar.gz lrwxrwxrwx 1 pokybuild users 60 Mar 28 16:40 core-image-lsb-qt3-mpc8315e-rdb.tar.gz -> core-image-lsb-qt3-mpc8315e-rdb-20120328232200.rootfs.tar.gz -rw-r--r-- 1 pokybuild users 405869678 Mar 28 16:52 core-image-lsb-sdk-mpc8315e-rdb-20120328232200.rootfs.tar.gz lrwxrwxrwx 1 pokybuild users 60 Mar 28 16:52 core-image-lsb-sdk-mpc8315e-rdb.tar.gz -> core-image-lsb-sdk-mpc8315e-rdb-20120328232200.rootfs.tar.gz -rw-rw-rw- 1 pokybuild users 49936897 Mar 27 02:11 modules-3.0.23-yocto-standard-r4-mpc8315e-rdb.tgz -rw-r--r-- 1 pokybuild users 2787800 Mar 27 02:11 uImage-3.0.24+git1+a4ac64fe873f08ef718e2849b88914725dc99c1c_1+7ba6d6853b6e7cf00a742baeba1503c80fc05314-r4-mpc8315e-rdb-20120327085644.bin lrwxrwxrwx 1 pokybuild users 137 Mar 27 02:11 uImage-mpc8315e-rdb.bin -> uImage-3.0.24+git1+a4ac64fe873f08ef718e2849b88914725dc99c1c_1+7ba6d6853b6e7cf00a742baeba1503c80fc05314-r4-mpc8315e-rdb-20120327085644.bin
http://autobuilder.yoctoproject.org/pub/nightly/20120403-1/machines/mpc8315e-rdb/ contains the dtb file. This build run was run with a cleaned sstate. What this tells me is that this is a sstate issue and is not an ab issue. Setting to "Build System" as the product. I can look at this but someone more versed in sstate might have more traction on it.
Still no dtb file in 1.4 M4 RC2: http://autobuilder.pokylinux.org/nightly/20120405-1/machines/mpc8315e-rdb/
Fixed merged to master: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=b2ae65f7d1054aa98dea9f5937567bec1dbf2f20