[U-Boot] [PATCH v2] MIPS: provide a default u-boot-spl.lds

[Daniel Schwierzeck]

Provide a default linker script for SPL binaries. Start address
and size of text section and BSS section are configurable. All
sections are arranged in a way that only relevant sections are
kept in the code section for maximum size reduction. All other
sections are kept but moved outside the code section to help
with debugging.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>

---

Changes in v2:
- add missing section .u_boot_list

 arch/mips/config.mk          |  5 ++-
 arch/mips/cpu/u-boot-spl.lds | 90 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 2 deletions(-)
 create mode 100644 arch/mips/cpu/u-boot-spl.lds

diff --git a/arch/mips/config.mk b/arch/mips/config.mk
index 609a998..dcd3460 100644
--- a/arch/mips/config.mk
+++ b/arch/mips/config.mk
@@ -65,7 +65,7 @@ else
 PF_ABICALLS			:= -mabicalls
 PF_PIC				:= -fpic
 PF_PIE				:= -pie
-PF_OBJCOPY			:= -j .got -j .u_boot_list -j .rel.dyn -j .padding
+PF_OBJCOPY			:= -j .got -j .rel.dyn -j .padding
 PF_OBJCOPY			+= -j .dtb.init.rodata
 endif
 
@@ -74,4 +74,5 @@ PLATFORM_CPPFLAGS		+= -msoft-float
 PLATFORM_LDFLAGS		+= -G 0 -static -n -nostdlib
 PLATFORM_RELFLAGS		+= -ffunction-sections -fdata-sections
 LDFLAGS_FINAL			+= --gc-sections $(PF_PIE)
-OBJCOPYFLAGS			+= -j .text -j .rodata -j .data $(PF_OBJCOPY)
+OBJCOPYFLAGS			+= -j .text -j .rodata -j .data -j .u_boot_list
+OBJCOPYFLAGS			+= $(PF_OBJCOPY)
diff --git a/arch/mips/cpu/u-boot-spl.lds b/arch/mips/cpu/u-boot-spl.lds
new file mode 100644
index 0000000..07004ea
--- /dev/null
+++ b/arch/mips/cpu/u-boot-spl.lds
@@ -0,0 +1,90 @@
+/*
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+MEMORY { .spl_mem : ORIGIN = CONFIG_SPL_TEXT_BASE, \
+		LENGTH = CONFIG_SPL_MAX_SIZE }
+MEMORY { .bss_mem : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \
+		LENGTH = CONFIG_SPL_BSS_MAX_SIZE }
+
+OUTPUT_ARCH(mips)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x00000000;
+
+	. = ALIGN(4);
+	.text : {
+		*(.text*)
+	} > .spl_mem
+
+	. = ALIGN(4);
+	.rodata : {
+		*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
+	} > .spl_mem
+
+	. = ALIGN(4);
+	.data : {
+		*(SORT_BY_ALIGNMENT(.data*))
+		*(SORT_BY_ALIGNMENT(.sdata*))
+	} > .spl_mem
+
+#ifdef CONFIG_SPL_DM
+	. = ALIGN(4);
+	.u_boot_list : {
+		KEEP(*(SORT(.u_boot_list*)));
+	} > .spl_mem
+#endif
+
+	. = ALIGN(4);
+	__image_copy_end = .;
+
+	.bss (NOLOAD) : {
+		__bss_start = .;
+		*(.bss*)
+		*(.sbss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end = .;
+	} > .bss_mem
+
+	.rel.dyn (NOLOAD) : {
+		*(.rel.dyn)
+	}
+
+	.dynsym : {
+		*(.dynsym)
+	}
+
+	.dynbss : {
+		*(.dynbss)
+	}
+
+	.dynstr : {
+		*(.dynstr)
+	}
+
+	.dynamic : {
+		*(.dynamic)
+	}
+
+	.plt : {
+		*(.plt)
+	}
+
+	.interp : {
+		*(.interp)
+	}
+
+	.gnu : {
+		*(.gnu*)
+	}
+
+	.MIPS.stubs : {
+		*(.MIPS.stubs)
+	}
+
+	.hash : {
+		*(.hash)
+	}
+}
-- 
2.7.4