.bss __rel_start (OVERLAY) was used to optimize RAM size used by
barebox. Since .bss and __rel_start overlap, we should clear bss only
after __rel_start was used. Following patch changed initialization
sequence to clear .bss before __rel_start:
1e5aef61fc6a444 ("MIPS: reloc: init bss and cpu")
This make relocation buffer unusable and broke relocation with different
symptoms reported by Antony Pavlov <antonynpavlov@xxxxxxxxx>:
* iomem output has no information on sdram regions, so memtest is unusable;
* pc = 0xa081232c, relocation does not work, barebox is located with 8M offset
from start of RAM. The board has 256M and relocation routine
should move barebox code much higher;
* pc = 0xa081232c, so barebox code works from KSEG1 not from KSEG0 as MMU=y option implies.
There is a choice of moving .bss clear sequence after __rel_start or
remove this optimization. Since the use of this optimization is minimal
and danger to trap in to similar issue is still high, i prefer to remove
this optimization.
Reported-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
Fixes: 1e5aef61fc6a444 ("MIPS: reloc: init bss and cpu")
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
arch/mips/lib/barebox.lds.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/lib/barebox.lds.S b/arch/mips/lib/barebox.lds.S
index 693a778980..c954df41f3 100644
--- a/arch/mips/lib/barebox.lds.S
+++ b/arch/mips/lib/barebox.lds.S
@@ -59,7 +59,7 @@ SECTIONS
_end = .;
- .bss __rel_start (OVERLAY) : {
+ .bss : {
__bss_start = .;
*(.sbss.*)
*(.bss.*)
--
2.25.0
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
