Hi Alessandro, Le 17/04/2011 03:19, Alessandro Rubini a écrit : > Hello. > I'm trying to make at91sam9261ek working again, but relocation > overlaps the destinatin address. > > In this board, u-boot runs already in RAM. This is exactly like the > nhk8815 that I ported a few hours ago, but while there the IPL > loaded our code at the beginning of RAM, in this case the IPL > loaded us already at end of RAM. > > Now, this is the printout of the situation: > > U-Boot code: 23F00000 -> 23F36EFC BSS: -> 23F78570 > monitor len: 00078570 > ramsize: 04000000 > TLB table at: 23ff0000 > Top of RAM usable for U-Boot at: 23ff0000 > Reserving 481k for U-Boot at: 23f64000 > Reserving 180k for malloc() at: 23f37000 > Reserving 24 Bytes for Board Info at: 23f36fe8 > Reserving 144 Bytes for Global Data at: 23f36f58 > New Stack Pointer is: 23f36f50 > RAM Configuration: > Bank #0: 20000000 64 MiB > relocation Offset is: 00064000 > > Since "tor len: 00078570" and "relocation Offset is: 00064000" the > system data-aborts during relocation, as code overwrites relocation > tables. > > What is the suggested solution? Changing the IPL is not acceptable for > me, because it is an external tool used by everyone: everybody knows > it loads and runs code at 23f0.0000. > > Thanks > /alessandro
IIUC, the issue is with the moving of the image. One solution I see, and which is not 100% perfect, would be that the copy code perform either a beginning-to-end copy or an end-to-beginning copy depending on the source and destination addresses and size. So, when copying say 256K from 0x01000000 to 0x03FC0000, the code could do the copy either way, beginning-to end (0x01000000 to 0x0103FFFF) or end-to-beginning (0x0103FFFF to 0x01000000); but when copying from 0x03FB0000 to 0x03FC0000, only the end-to-beginning copy would be possible. This still leaves holes in that copying U-Boot from RAM to RAM where the source is *really* near the end might actually trash the copy code itself. Maybe the instruction cache will help, but I won't bet on this without heavy testing. Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
