Hi, > Am 12.02.2026 um 23:19 schrieb Andreas Kemnade <[email protected]>: > > On Thu, 12 Feb 2026 17:55:43 +0100 > "H. Nikolaus Schaller" <[email protected]> wrote: > >>> Am 12.02.2026 um 17:47 schrieb Andreas Kemnade <[email protected]>: >>> >>> On Thu, 12 Feb 2026 16:49:43 +0100 >>> "H. Nikolaus Schaller" <[email protected]> wrote: >>> >>>>> Am 12.02.2026 um 16:26 schrieb Kory Maincent (TI) >>>>> <[email protected]>: >>>>> >>>>> Allow overlays to be applied to any DTB. This adds around ~40% to the >>>>> total size of the DTB files on average. >>>> >>>> Is this unconditionally enabled or can it be turned off by some CONFIG? We >>>> have >>>> our own defconfig so I would not worry if if is enabled in >>>> omap2plus_defconfig >>>> and disabled in ours. >>>> >>>> We have several devices where the boot loader can't handle overlays (never >>>> touch >>>> a working boot-loader :) So this seems to only contribute to build and >>>> load time >>>> without benefit. >>>> >>> As long as you do not add overlays, the bootloader does not care. I would >>> like to simply carry around the 1-bit mmc overlay for one broken board. >>> That would help me. So I think there is a benefit but nobody forces >>> you to use it. >> >> Well, it does not force to use the really good feature, but it forces to add >> ~40% more file size and some more compile time, if I understand it correctly. >> > Compile time, hardly measurable even if you just do make dtbs. > > Size on disk: > a) if it lives around in a /boot partitions with kernels and initrams in it, > then we are around 1% more space needed.
Ah, I see. I was too focussed on the "adds around ~40% to the total size of the DTB files". For the Letux arm distro all DTBs are around 8.1 MB at the moment so it will grow not that much (there are non-TI devices included). So you are right, it is ~1% of the total if the kernel image is counted. Therefore, space should not be something we should be too concerned about (although I remember discussions for driver code where every single byte did count). On the other hand this increases load time from (sometimes slow) µSD for a specific DTB by 40%. That should at least be discussed. BR, Nikolaus
