Hi, On 08/01/2021 01:39, Bill Mills wrote: > All, > > On the Devicetree evolution call Wednesday I promised to finish my comparison > of u-boot DT vs kernel DT. > The script is not perfect but the results are still interesting. > > For each dts and dtsi file in the tip of the u-boot tree, it tries to > correlate it to the kernel tip. > It compares git SHA1 signatures or falls back to filenames. > The results were surprising to me but perhaps they should not have been. > > I have checked in the script[1] and the full results here [2] > > The full file lists (with some diff stats) are in the root dir. > Example [3] > > I also looked at the line count of the u-boot override files. > Even though we don't expect these to correlate, we do expect reasonable usage > to result in small files. Big files are an indication of possible abuse of > the system. (I don't think the idea was to have wholesale new versions of > the DTS as an override.) > > I plan to redo the script in python. It will be much easier to be more > precise and to look deeper. (For example figure out how old the u-boot > version is in number of change sets and number of days. Or if no content > sync now were they ever synced?) > > Here is the scripts output: (from summary.txt) > > Devicetree sync status for u-boot v2021.01-rc5-7-gb8c725e736 > Compared to kernel v5.11-rc2-156-g71c061d24438
Do not compare with a such kernel, usually DT is sync'ed from stable kernels, or -rc1, so 5.11 stuff will eventually go for next u-boot release, not the actual one. We (amlogic/meson) will sync part of DT with 5.10 for next release, the previous is sync'ed to 5.9/5.8. It's almost impossible to sync to each release. Neil > 14% (255) are completely synced > 253 arm > 2 riscv > 0 mips > 0 powerpc > 0 x86 > 0 68k > 0 microblaze > 0 sh > 0 arc > 23% (416) content has appeared in the kernel but is not up to date > 411 arm > 0 riscv > 1 mips > 0 powerpc > 1 x86 > 0 68k > 0 microblaze > 0 sh > 1 arc > 33% (584) filename appears in kernel but content never has > 467 arm > 1 riscv > 12 mips > 91 powerpc > 0 x86 > 0 68k > 0 microblaze > 0 sh > 8 arc > 28% (510) neither filename nor content appears in kernel > 305 arm > 4 riscv > 48 mips > 35 powerpc > 44 x86 > 0 68k > 1 microblaze > 1 sh > 6 arc > n/a (510) U-Boot specific, no correlation expected > 7 sandbox > 358 override > 211 test > histogram of override size (in raw lines) > 10 61 > 20 53 > 30 38 > 40 33 > 50 23 > 60 14 > 70 12 > 80 7 > 90 5 > 100 4 > 110 4 > 120 5 > 130 6 > 140 4 > 150 0 > 160 2 > 170 0 > 180 0 > 190 4 > 200 0 > 210 2 > 220 2 > 230 1 > 240 2 > 250 1 > 260 1 > 270 1 > 280 0 > 290 0 > 300 0 > 310 0 > 320 1 > > > [1] > https://github.com/wmamills/devicetree-source/blob/master/scripts/correlate-dts > [2] https://github.com/wmamills/devicetree-source > [3] > https://github.com/wmamills/devicetree-source/blob/master/dts-somewhere.txt > _______________________________________________ boot-architecture mailing list [email protected] https://lists.linaro.org/mailman/listinfo/boot-architecture
