Dear Albert ARIBAUD, > > Right now I can build (not run, mind you) u-boot for edminiv2 without > -fPIC/-fPIE, with -pie and a modified u-boot.lds and start.S. Almost all > of the .rel.dyn fixup entries are type 23, that is, relative to the base > address, which is good. However, here are about ten at the end which are > type 2 -- symbol-relative -- and I am studying them in order to see if > they are needed. > > If type 23 relocations are all that is needed, then a first ARM ELF > relocation implementation should 'simply' trade GOT vs .rel.dyn > relocation in start.S (I am almost there) and remove fixups in > board_init_r. Start.S would apply type 23 fixups only and ignore the > rest. Later on we could add a build stage to rewrite the .rel.dyn > section as suggested, by filtering out non-type-23 relocs and keeping > only the address part of type-23 ones, reducing the .rel.dyn table > roughly by half. > > The good news is, I can spare a couple more hours today on this. I'll > let you all know how this fares!
Thats good news! How much did the image size increase with this table? And I am willing to test your efforts on AT91 here, maybe you can send me the changes to .lds and start.S beforehand so I can see what type of relocation info gets produced here. A rather wild, but quite arch independant additional "build stage" for relocation would be to link u-boot for two different TEXT_BASE values e.g. TEXT_BASE (as desired) and TEXT_BASE+0x00010010. A special "diff" tool should find the 32 bit places where relocation is required and add a table to the end of u-boot.bin... (Just a rough idea) Best Regards, Reinhard _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
