From 080889a135bb5a1e34f8acae3c0a330d6bd620f5 Mon Sep 17 00:00:00 2001
From: Barry Wardell <rockbox@barrywardell.net>
Date: Sun, 14 Oct 2007 18:09:40 +0000
Subject: [PATCH] Add support for installing/replacing the bootloader in the
 PPBL section of the firmware partition. Allows installation of the Rockbox
 bootloader in place of the Sandisk one. This expects a plain bootloader
 binary with no header. Our Rockbox bootloader successfully boots both Rockbox
 and the OF when installed in this way. This makes it easy to get to a state
 where e200tool is required, so care is advised.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15108 a1c6a512-1295-4272-9138-f99709370657
---
 rbutil/sansapatcher/main.c         | 30 +++++++++++++++++++-
 rbutil/sansapatcher/sansapatcher.c | 44 ++++++++++++++++++++++++++++++
 rbutil/sansapatcher/sansapatcher.h |  1 +
 3 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/rbutil/sansapatcher/main.c b/rbutil/sansapatcher/main.c
index 4b07af14ec..fb87aec2a4 100644
--- a/rbutil/sansapatcher/main.c
+++ b/rbutil/sansapatcher/main.c
@@ -48,7 +48,8 @@ enum {
    WRITE_FIRMWARE,
    READ_PARTITION,
    WRITE_PARTITION,
-   UPDATE_OF
+   UPDATE_OF,
+   UPDATE_PPBL
 };
 
 void print_usage(void)
@@ -67,6 +68,7 @@ void print_usage(void)
     fprintf(stderr,"  -a,   --add-bootloader            filename.mi4\n");
     fprintf(stderr,"  -d,   --delete-bootloader\n");
     fprintf(stderr,"  -of   --update-original-firmware  filename.mi4\n");
+    fprintf(stderr,"  -bl   --update-ppbl               filename.bin\n");
     fprintf(stderr,"\n");
 
 #ifdef __WIN32__
@@ -225,6 +227,13 @@ int main(int argc, char* argv[])
             if (i == argc) { print_usage(); return 1; }
             filename=argv[i];
             i++;
+        } else if ((strcmp(argv[i],"-bl")==0) || 
+                   (strcmp(argv[i],"--update-ppbl")==0)) {
+            action = UPDATE_PPBL;
+            i++;
+            if (i == argc) { print_usage(); return 1; }
+            filename=argv[i];
+            i++;
         } else if ((strcmp(argv[i],"-rf")==0) || 
                    (strcmp(argv[i],"--read-firmware")==0)) {
             action = READ_FIRMWARE;
@@ -345,6 +354,25 @@ int main(int argc, char* argv[])
             } else {
                 fprintf(stderr,"[ERR]  --update-original-firmware failed.\n");
             }
+        } else if (action==UPDATE_PPBL) {
+            printf("[WARN] PPBL installation will overwrite your bootloader. This will lead to a\n");
+            printf("       Sansa that won't boot if the bootloader file is invalid. Only continue if\n");
+            printf("       you're sure you know what you're doing.\n");
+            printf("       Continue (y/n)? ");
+
+            if (fgets(yesno,4,stdin)) {
+                if (yesno[0]=='y') {
+                    if (sansa_reopen_rw(&sansa) < 0) {
+                        return 5;
+                    }
+        
+                    if (sansa_update_ppbl(&sansa, filename)==0) {
+                        fprintf(stderr,"[INFO] PPBL updated successfully.\n");
+                    } else {
+                        fprintf(stderr,"[ERR]  --update-ppbl failed.\n");
+                    }
+                }
+            }
         }
     }
 
diff --git a/rbutil/sansapatcher/sansapatcher.c b/rbutil/sansapatcher/sansapatcher.c
index 1f74067344..2d44e75303 100644
--- a/rbutil/sansapatcher/sansapatcher.c
+++ b/rbutil/sansapatcher/sansapatcher.c
@@ -886,3 +886,47 @@ int sansa_update_of(struct sansa_t* sansa, char* filename)
     return 0;
 }
 
+/* Update the PPBL (bootloader) image in the hidden firmware partition */
+int sansa_update_ppbl(struct sansa_t* sansa, char* filename)
+{
+    int n;
+    int infile = -1;   /* Prevent an erroneous "may be used uninitialised" gcc warning */
+    int ppbl_length = 0; /* Keep gcc happy when building for rbutil */
+
+    /* Step 1 - read bootloader into RAM. */
+    infile=open(filename,O_RDONLY|O_BINARY);
+    if (infile < 0) {
+        fprintf(stderr,"[ERR]  Couldn't open input file %s\n",filename);
+        return -1;
+    }
+
+    ppbl_length = filesize(infile);
+
+    n = read(infile,sectorbuf+0x200,ppbl_length);
+    close(infile);
+    if (n < ppbl_length) {
+           fprintf(stderr,"[ERR]  Short read - requested %d bytes, received %d\n", ppbl_length, n);
+           return -1;
+    }
+
+    /* Step 2 - Build the header */
+    memset(sectorbuf,0,0x200);
+    memcpy(sectorbuf,"PPBL",4);
+    int2le(ppbl_length, sectorbuf+4);
+    int2le(0x00010000,  sectorbuf+8);
+
+    /* Step 3 - write the bootloader to the Sansa */
+    if (sansa_seek(sansa, sansa->start) < 0) {
+        fprintf(stderr,"[ERR]  Seek to 0x%08llx in sansa_update_ppbl failed.\n", sansa->start);
+        return -1;
+    }
+
+    n=sansa_write(sansa, sectorbuf, ppbl_length + 0x200);
+    if (n < (ppbl_length+0x200)) {
+        fprintf(stderr,"[ERR]  Short write in sansa_update_ppbl\n");
+        return -1;
+    }
+
+    return 0;
+}
+
diff --git a/rbutil/sansapatcher/sansapatcher.h b/rbutil/sansapatcher/sansapatcher.h
index bb9e0f1340..7f113ec083 100644
--- a/rbutil/sansapatcher/sansapatcher.h
+++ b/rbutil/sansapatcher/sansapatcher.h
@@ -37,6 +37,7 @@ int sansa_read_firmware(struct sansa_t* sansa, char* filename);
 int sansa_add_bootloader(struct sansa_t* sansa, char* filename, int type);
 int sansa_delete_bootloader(struct sansa_t* sansa);
 int sansa_update_of(struct sansa_t* sansa,char* filename);
+int sansa_update_ppbl(struct sansa_t* sansa,char* filename);
 void sansa_list_images(struct sansa_t* sansa);
 
 #endif