mips32-npc loader scripts

am/arch/mips32-npc/img/boot/Makefile

@@ -1,2 +1,4 @@
 start.o: start.S
-	mips-linux-gnu-gcc -EL -march=mips32 -fno-pic -MMD -mno-abicalls -fno-delayed-branch -c start.S -o start.o
+	mips-linux-gnu-gcc -I$(AM_HOME)/am/arch/mips32-npc/include -EL -march=mips32 -fno-pic -MMD -mno-abicalls -fno-delayed-branch -c start.S -o start.o
+
+-include start.d

am/arch/mips32-npc/img/boot/start.S

@@ -1,13 +1,15 @@
+.section loader, "x"
 .globl _start
 .type _start, @function
-.globl _qemu
+.globl _ex_entry
-.type _qemu, @function
+.type _ex_entry, @function
-.extern _trm_init
 
 _start:
   li $sp, 0x17fffffc
-  jal _trm_init
+  la $k0, _trm_init
+  jr $k0
 
-_qemu:
+.org 0x20
-  nop
+_ex_entry:
-  jal _trm_init
+  la $k0, _trap
+  jr $k0

am/arch/mips32-npc/img/build

@@ -6,13 +6,9 @@ shift
 
 bash -c "cd $DIR/boot && make"
 
-mips-linux-gnu-ld -EL -T $DIR/loader.ld -e _start -o ${DEST}.o $DIR/boot/start.o --start-group $@ --end-group
+mips-linux-gnu-ld -EL -T $DIR/loader.ld -e _start -o ${DEST}.o $DIR/boot/start.o --start-group $@ --end-group &&  \
-
+mips-linux-gnu-objdump -d ${DEST}.o > ${DEST}.code.txt && \
-# generate COE
+mips-linux-gnu-objcopy -O binary ${DEST}.o ${DEST}.bin && \
-mips-linux-gnu-objdump -d ${DEST}.o > ${DEST}.code.txt
+python $DIR/scripts/gen_bram_coe.py ${DEST}.bin ${DEST}.coe && \
-mips-linux-gnu-objcopy -O binary ${DEST}.o ${DEST}.bin
-python $DIR/scripts/gen_bram_coe.py ${DEST}.bin ${DEST}.coe
-
-# check instructions
 mips-linux-gnu-objdump -d ${DEST}.o | python $DIR/scripts/instr_check.py
 

am/arch/mips32-npc/img/loader.ld

@@ -1,13 +1,15 @@
-SECTIONS
+MEMORY {
-{
+  bram : ORIGIN = 0x0, LENGTH = 8K
-    . = 0x10000000;
+  ddr : ORIGIN = 0x10000000, LENGTH = 128M
-    .text : { *(.text) }
+}
-    .data : { *(.data) }
+
-    __bss_start = . ;
+SECTIONS {
-    .bss : {
+  loader : { *(loader) } > bram
-	*(.bss)
+  .text : { *(.text) } > ddr
-	*(.scommon)
+  .data : { *(.data) } > ddr
-	*(.sbss)
+  .bss : {
-    }
+    __bss_start = .;
-    _end = . ;
+    *(.bss)
-}
+    _end = . ;
+  } > ddr
+}