MIPS: provide a default u-boot-spl.lds

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@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>

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)

arch/mips/cpu/u-boot-spl.lds

+/*
+ * 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)
+	}
+}