Changeset 300 for soft/giet_vm/create_dmg

Timestamp:

Apr 10, 2014, 2:33:56 PM (10 years ago)

Author:

cfuguet

Message:

The disk image used by the GIET_VM does not contain
anymore a Master Boot Record (MBR) as we do not need
multiple partitions.

The only filesystem in the disk is the FAT32 which
starts at sector 0 (Volume Boot Record).

File:

• soft/giet_vm/create_dmg (modified) (3 diffs)

soft/giet_vm/create_dmg

@@ -6 +6 @@
 sector_size=512
 sectors_per_cluster=8
-reserved_sectors=32
+reserved_sectors=512
 
 # FAT32 SPEC: The first two clusters are not present in the data region but
@@ -59 +59 @@
                         format="UDRW" 
 
-                        echo "Creating partition file $3 from $2 directory"
+                        # -F FAT type = 32 (FAT32)
+                        # -c sectors/cluster
+                        # -n number of FATs
+                        # -r reserved sectors
+                        # -k backup boot sector (VBR and FS INFO) = 0xffff (no backup)
+                        echo "Creating partition file $3.dmg from $2 directory"
+                        fsargs="-F32 -c $sectors_per_cluster -n 1 -r $reserved_sectors -k 0xffff"
                         hdiutil create \
                                 -fs MS-DOS \
@@ -66 +72 @@
                                 -sectors $sectors \
                                 -ov \
-                                -fsargs "-F32 -c$sectors_per_cluster -n1 -r$reserved_sectors" \
+                                -fsargs "$fsargs" \
                                 -format $format \
                                 $3;