ben-blinkenlights/avrdude/patches/low-addr.patch

Index: avrdude/avrdude-5.10/avrpart.h
===================================================================
--- avrdude.orig/avrdude-5.10/avrpart.h	2011-03-08 23:40:10.000000000 -0300
+++ avrdude/avrdude-5.10/avrpart.h	2011-03-08 23:40:13.000000000 -0300
@@ -185,6 +185,8 @@
 
   unsigned char * buf;        /* pointer to memory buffer */
   OPCODE * op[AVR_OP_MAX];    /* opcodes */
+
+  int low_addr;		      /* lowest address used, in bytes */
 } AVRMEM;
 
 #ifdef __cplusplus
Index: avrdude/avrdude-5.10/config_gram.y
===================================================================
--- avrdude.orig/avrdude-5.10/config_gram.y	2011-03-08 23:40:10.000000000 -0300
+++ avrdude/avrdude-5.10/config_gram.y	2011-03-08 23:40:13.000000000 -0300
@@ -1209,6 +1209,7 @@
     } 
     mem_specs 
     { 
+      current_mem->low_addr = current_mem->size;
       ladd(current_part->mem, current_mem); 
       current_mem = NULL; 
     } |
Index: avrdude/avrdude-5.10/fileio.c
===================================================================
--- avrdude.orig/avrdude-5.10/fileio.c	2011-03-08 23:40:10.000000000 -0300
+++ avrdude/avrdude-5.10/fileio.c	2011-03-08 23:40:13.000000000 -0300
@@ -52,7 +52,7 @@
              char * outfile, FILE * outf);
 
 static int ihex2b(char * infile, FILE * inf,
-             unsigned char * outbuf, int bufsize);
+             unsigned char * outbuf, int bufsize, int *low_addr);
 
 static int b2srec(unsigned char * inbuf, int bufsize, 
            int recsize, int startaddr,
@@ -69,7 +69,8 @@
                   char * filename, FILE * f, unsigned char * buf, int size);
 
 static int fileio_ihex(struct fioparms * fio, 
-                  char * filename, FILE * f, unsigned char * buf, int size);
+                  char * filename, FILE * f, unsigned char * buf, int size,
+		  int *low_addr);
 
 static int fileio_srec(struct fioparms * fio,
                   char * filename, FILE * f, unsigned char * buf, int size);
@@ -262,7 +263,7 @@
  *
  * */
 static int ihex2b(char * infile, FILE * inf,
-             unsigned char * outbuf, int bufsize)
+             unsigned char * outbuf, int bufsize, int *low_addr)
 {
   char buffer [ MAX_LINE_LEN ];
   unsigned char * buf;
@@ -271,7 +272,7 @@
   int lineno;
   int len;
   struct ihexrec ihex;
-  int rc;
+  int rc, lowest;
 
   lineno      = 0;
   buf         = outbuf;
@@ -279,6 +280,7 @@
   maxaddr     = 0;
   offsetaddr  = 0;
   nextaddr    = 0;
+  lowest      = bufsize;
 
   while (fgets((char *)buffer,MAX_LINE_LEN,inf)!=NULL) {
     lineno++;
@@ -313,11 +315,14 @@
         for (i=0; i<ihex.reclen; i++) {
           buf[nextaddr+i-offsetaddr] = ihex.data[i];
         }
+	if (nextaddr-offsetaddr < lowest)
+	  lowest = nextaddr-offsetaddr;
         if (nextaddr+ihex.reclen > maxaddr)
           maxaddr = nextaddr+ihex.reclen;
         break;
 
       case 1: /* end of file record */
+	*low_addr = lowest;
         return maxaddr-offsetaddr;
         break;
 
@@ -354,6 +359,7 @@
           "file \"%s\"\n",
           progname, infile);
 
+  *low_addr = lowest;
   return maxaddr-offsetaddr;
 }
 
@@ -777,7 +783,8 @@
 
 
 static int fileio_ihex(struct fioparms * fio, 
-                  char * filename, FILE * f, unsigned char * buf, int size)
+                  char * filename, FILE * f, unsigned char * buf, int size,
+		  int *low_addr)
 {
   int rc;
 
@@ -790,7 +797,7 @@
       break;
 
     case FIO_READ:
-      rc = ihex2b(filename, f, buf, size);
+      rc = ihex2b(filename, f, buf, size, low_addr);
       if (rc < 0)
         return -1;
       break;
@@ -1021,6 +1028,7 @@
   struct fioparms fio;
   AVRMEM * mem;
   int using_stdio;
+  int low_addr = 0;
 
   mem = avr_locate_mem(p, memtype);
   if (mem == NULL) {
@@ -1113,7 +1121,7 @@
 
   switch (format) {
     case FMT_IHEX:
-      rc = fileio_ihex(&fio, fname, f, buf, size);
+      rc = fileio_ihex(&fio, fname, f, buf, size, &low_addr);
       break;
 
     case FMT_SREC:
@@ -1149,6 +1157,8 @@
        */
       rc = avr_mem_hiaddr(mem);
     }
+    if (op == FIO_READ && low_addr < mem->low_addr)
+	mem->low_addr = low_addr;
   }
   if (format != FMT_IMM && !using_stdio) {
     fclose(f);