[U-Boot] [RFC 1/5] powerpc:Add support of SPL non-relocation

[Prabhakar Kushwaha]

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.

Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
---
 arch/powerpc/cpu/mpc85xx/u-boot-spl.lds |   25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
index bc13267..ffc6ad3 100644
--- a/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
+++ b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
@@ -57,13 +57,34 @@ SECTIONS
 	. = ALIGN(8);
 	__init_begin = .;
 	__init_end = .;
+#ifdef CONFIG_SKIP_RELOCATE_SPL
+	/*
+	 * Make sure that the bss segment isn't linked at 0x0, otherwise its
+	 * address won't be updated during relocation fixups.
+	 */
+	. |= 0x10;
+
+	. = ALIGN(4);
+	__bss_start = .;
+	.bss : {
+		*(.sbss*)
+		*(.bss*)
+	}
+	. = ALIGN(4);
+	__bss_end = .;
+#endif
 /* FIXME for non-NAND SPL */
 #if defined(CONFIG_FSL_IFC) /* Restrict bootpg at 4K boundry for IFC */
-	.bootpg ADDR(.text) + 0x1000 :
+#ifndef BOOT_PAGE_OFFSET
+#define BOOT_PAGE_OFFSET 0x1000
+#endif
+	.bootpg ADDR(.text) + BOOT_PAGE_OFFSET :
 	{
 		arch/powerpc/cpu/mpc85xx/start.o (.bootpg)
 	}
+#ifndef RESET_VECTOR_OFFSET
 #define RESET_VECTOR_OFFSET 0x1ffc /* IFC has 8K sram */
+#endif
 #elif defined(CONFIG_FSL_ELBC)
 #define RESET_VECTOR_OFFSET 0xffc /* LBC has 4k sram */
 #else
@@ -80,6 +101,7 @@ SECTIONS
 	} = 0xffff
 #endif
 
+#ifndef CONFIG_SKIP_RELOCATE_SPL
 	/*
 	 * Make sure that the bss segment isn't linked at 0x0, otherwise its
 	 * address won't be updated during relocation fixups.
@@ -94,4 +116,5 @@ SECTIONS
 	}
 	. = ALIGN(4);
 	__bss_end = .;
+#endif
 }
-- 
1.7.9.5