On Tue, 2009-10-06 at 18:43 -0500, Peter Tyser wrote: > > > The values all changed and are dependent on RAM size, but their > > > relationship to one another didn't - they all just increased by > > > 0x7fff0000. So practically speaking, we do need to know where the bss > > > is at link time - its address is not dynamic like the malloc pool or > > > stack - its tied directly to the address of the other sections at link > > > time. (Unless we added some bss-specific fixups I imagine) > > > > Right, that's the current situation. > > > > My suggestion was NOT to put the bss at a fixed _offset_ to the > > U-Boot image, but to a fixed absolute address. My hope is that this > > might simplify the linker scripts at the cost of adding a little code > > to the relocation routine - for addresses in the bss we would have to > > add a different relocation offset. > > I think I see what you're getting at. If we have a bss-specific fixup > routine I don't give a hoot where the bss is located at link time. Its > just that that bss-aware fixup routine doesn't exist right now:) > > It seems like a clean solution. Adding a bss-aware fixup routine or > putting the bss after the U-Boot image both seem good to me. The > bss-aware fixup routine has a clearer readelf output and slightly more > complicated code while the bss-after-uboot change has a misleading > readelf output and simpler code. In any case I'd give a thumbs up to > either of them.
Sorry, just to be clear, where did you want to put the fixed up bss? Still at a low memory address, ie the original address at link time? I had assumed if we were adding a bss-specific fixup we'd move it to the top of memory, near U-Boot, the malloc pool, etc. I'd be all for relocating it to higher in memory, but wouldn't be too excited about leaving at a low memory address... If we were to add bss fixups, we may as well move it to a location that lines up with the rest of U-Boot code, stack, and malloc, right? Best, Peter _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot