begin ARM firmware

src/utils/Makefile

@@ -0,0 +1,12 @@
+
+CC = gcc
+CFLAGS = -Wall -Wstrict-prototypes -Werror
+
+all: lpcchksum
+
+lpcchksum: lpcchksum.o
+	$(CC) $(CFLAGS) $^ --output $@
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+

src/utils/lpcchksum.c

@@ -0,0 +1,67 @@
+/*
+ * calculate+inject LPC1700 vector checksum
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+
+uint32_t getu32(uint8_t *buffer) {
+	return buffer[0]+(buffer[1]<<8)+(buffer[2]<<16)+(buffer[3]<<24);
+}
+
+void putu32(uint8_t *buffer, uint32_t data) {
+	buffer[0]=(uint8_t)(data&0xff);
+	buffer[1]=(uint8_t)((data>>8)&0xff);
+	buffer[2]=(uint8_t)((data>>16)&0xff);
+	buffer[3]=(uint8_t)((data>>24)&0xff);
+}
+
+int main(int argc, char **argv) {
+	FILE *bin;
+	uint32_t data;
+	size_t len;
+	int count;
+	uint8_t *buffer;
+
+	if(argc<2) {
+		fprintf(stderr, "Usage: %s <binfile>\nThe original file will be modified!\n", argv[0]);
+		return 1;
+	}
+
+	if((bin=fopen(argv[1], "rb"))==NULL) {
+		perror("could not open input file");
+		return 1;
+	}
+	
+	fseek(bin, 0, SEEK_END);
+	len=ftell(bin);
+	fseek(bin, 0, SEEK_SET);
+	if((buffer=malloc(len))==NULL) {
+		perror("could not reserve memory");
+		fclose(bin);
+		return 1;
+	}
+	fread(buffer, len, 1, bin);
+	fclose(bin);
+
+	data=0;
+	for(count=0; count<7; count++) {
+		data+=getu32(buffer+4*count);
+	}
+	printf("data=%x chksum=%x\n", data, ~data+1);
+	putu32(buffer+28,~data+1);
+
+	if((bin=fopen(argv[1], "wb"))==NULL) {
+		perror("could not open output file");
+		return 1;
+	}
+
+	fwrite(buffer, len, 1, bin);
+	fclose(bin);
+	printf("done\n");
+	free(buffer);
+
+	return 0;
+}