Le 05/10/2010 15:18, Reinhard Meyer a écrit : > Dear Albert ARIBAUD, >> Le 05/10/2010 13:17, Reinhard Meyer a écrit : >>> Dear All ;) >>>>> Umm... is my understanding correct that we can drop the whole >>>>> CONFIG_SYS_ARM_WITHOUT_RELOC stuff then, too? >>>> >>>> I believe we're just changing the relocation solution, but we're not >>>> changing the overall strategy regarding CONFIG_SYS_ARM_WITHOUT_RELOC. >>> >>> We should not forget that right now, the "ELF" method uses 8 byte entries >>> to relocate, compared to 4 byte entries with the "GOT" method. We >>> should not proceed too fast here, the "thought about" tool to squeeze >>> down >>> the relocation information should not be completely forgotten... >>> >>> Otherwise even more boards would need to change their mtd partitioning ;) >>> >>> And I am not too happy if I cannot downgrade to the AT91SAM9XE256 anymore >>> (256K NOR) if the 512K version proves difficult to obtain ;) >>> >>> Reinhard >> >> I still think a configuration option to choose between relocation >> formats would be useful. It could offer: >> >> - pure ELF format (8 bytes per relocation plus .dynsym) >> >> ... already there, and then to be done: >> >> - unified 32-bit format (half the size of pure ELF) >> >> - unified 16-bit delta format (a fourth of the size of pure ELF) > > Even an 8-bit delta format is possible: > use the value of 0x00 to skip forward 256 addresses, other values to patch.. > Assuming that all relocations must be on a 32 bit boundary, the delta values > could even be multiplied by 4 :)
i can see ASN.1-style variable-length integer encoding creeping around, just waiting to be invoked thrice. :) > Best Regards, > Reinhard > > PS: I finished the "C" relocation, but it does not work :( > having problems with setting the stack or calling of board_init_r(), > I am not sure. Because of otther work I cannot continue there right now. > If you want to look at it, I can make a patch. Please do ! Amicalement, -- Albert. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
