On Fri, Jul 07, 2017 at 01:44:39PM +0200, Jean-Jacques Hiblot wrote: > u-boot can be embedded within a FIT image with multiple DTBs. It then > selects at run-time which one is best suited for the platform. > Use the same principle here for the SPL: put the DTBs in a FIT image, > compress it (LZO, GZIP, or no compression) and append it at the end of the > SPL. > > Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com> > --- > > The impact in terms of boot time is not high when using LZO but I gues it can > vary > from platform to platform. > The size of the SPL binary is increased (1.5kB more code on ARM), but the > compression > really flattens the DTBS. so at the end of the day, enabling this option > doesn't add much. > > Here are some sumbers with a DRA7 platform (numbers in bytes): > size delta with ref > MLO.reference 123450 > MLO.lzo_1_DTB 123715 +265 > MLO.lzo_4_DTB 124237 +787 > MLO.gzip_4_DTB 132006 +8556 > MLO.no_comp_4_DTB 134184 +10734
Bearing in mind that you said in a follow up this is RFC, I'm ignoring all of the stuff that I believe you would fix in a v1. At the heart of it, are you able to tell different boards before you have a DTB loaded? I keep coming back to the problem that for SPL it seems like we should be able to do what Franklin did for keystone (https://patchwork.ozlabs.org/patch/777242/) and have a 'fake' dts file that represents the SoC such that any real boards can get U-Boot loaded and from there have the real board dtb be used. Or am I forgetting something? Thanks! -- Tom
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