Current SPL code base has BSS section placed after reset_vector. This means they have to relocate to use the global variables. This put an implicit requirement of having SPL size = Memory/2.
To avoid relocation: - Move bss_section within SPL range - Modify relocate_code()
Signed-off-by: Prabhakar Kushwaha prabhakar@freescale.com --- Changes for v2: Sending as it is
README | 3 +++ arch/powerpc/cpu/mpc85xx/start.S | 2 ++ arch/powerpc/cpu/mpc85xx/u-boot-spl.lds | 12 ++++++++++++ 3 files changed, 17 insertions(+)
diff --git a/README b/README index 025386f..a66afb1 100644 --- a/README +++ b/README @@ -3310,6 +3310,9 @@ FIT uImage format: continuing (the hardware starts execution after just loading the first page rather than the full 4K).
+ CONFIG_SPL_SKIP_RELOCATE + Avoid SPL relocation + CONFIG_SPL_NAND_BASE Include nand_base.c in the SPL. Requires CONFIG_SPL_NAND_DRIVERS. diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index 67e071b..c654363 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -1645,6 +1645,7 @@ relocate_code: mr r10,r5 /* Save copy of Destination Address */
GET_GOT +#ifndef CONFIG_SPL_SKIP_RELOCATE mr r3,r5 /* Destination Address */ lis r4,CONFIG_SYS_MONITOR_BASE@h /* Source Address */ ori r4,r4,CONFIG_SYS_MONITOR_BASE@l @@ -1735,6 +1736,7 @@ relocate_code:
mtlr r0 blr /* NEVER RETURNS! */ +#endif .globl in_ram in_ram:
diff --git a/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds index 4fad68b..8453f3a 100644 --- a/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds +++ b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds @@ -57,6 +57,16 @@ SECTIONS . = ALIGN(8); __init_begin = .; __init_end = .; +#ifdef CONFIG_SPL_SKIP_RELOCATE + . = ALIGN(4); + __bss_start = .; + .bss : { + *(.sbss*) + *(.bss*) + } + . = ALIGN(4); + __bss_end = .; +#endif
/* For ifc, elbc, esdhc, espi, all need the SPL without section .resetvec */ #ifdef CONFIG_SYS_MPC85XX_NO_RESETVEC @@ -86,6 +96,7 @@ SECTIONS } = 0xffff #endif
+#ifndef CONFIG_SPL_SKIP_RELOCATE /* * Make sure that the bss segment isn't linked at 0x0, otherwise its * address won't be updated during relocation fixups. @@ -100,4 +111,5 @@ SECTIONS } . = ALIGN(4); __bss_end = .; +#endif }