leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

85xx: Ensure BSS segment isn't linked at address 0

Browse Source 
When U-Boot is relocated from flash to RAM pointers are modified
accordingly.  However, pointers initialzed with NULL values should not
be modified so that they maintain their intended NULL value.  If the
BSS segment is linked at address 0 its address will not be
updated as necessary during relocation.

This is a temporary workaround.  The end goal is to add support to
U-Boot to dynamically locate the BSS at an arbitrary address at
runtime.  When the ability to fixup the BSS inteligently is
added, this workaround can be removed and the 85xx link script
can put the BSS at a fixed address at link time.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
This commit is contained in:
Peter Tyser 2009-10-07 11:45:00 -05:00 committed by Wolfgang Denk
parent 3469424cb6
commit 3beb40c247
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
cpu/mpc85xx/u-boot.lds
View File

@ -131,6 +131,17 @@ SECTIONS
. = RESET_VECTOR_ADDRESS + 0x4;
/*
* Make sure that the bss segment isn't linked at 0x0, otherwise its
* address won't be updated during relocation fixups. Note that
* this is a temporary fix. Code to dynamically the fixup the bss
* location will be added in the future. When the bss relocation
* fixup code is present this workaround should be removed.
*/
#if (RESET_VECTOR_ADDRESS == 0xfffffffc)
. |= 0x10;
#endif
__bss_start = .;
.bss (NOLOAD) :
{