commit 52ca8d6af01d140b1a022958bb5953f00bb7c714
author bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> Wed Jun 14 16:03:05 2006 +0000
committer bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> Wed Jun 14 16:03:05 2006 +0000
tree fcc145155a5b690358da9071820c2356b92d3b82
parent 5cbfcd00b0822d9a1a69a65a2d6927f6c4142787

-no-fd-bootchk option (Lonnie Mendez)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1976 c046a42c-6fe2-441c-8c8c-71466251a162

hw/pc.c

diff --git a/hw/pc.c b/hw/pc.c
index b722190..361f4bb 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -193,6 +193,8 @@
     case 'a':
     case 'b':
         rtc_set_memory(s, 0x3d, 0x01); /* floppy boot */
+        if (!fd_bootchk)
+            rtc_set_memory(s, 0x38, 0x01); /* disable signature check */
         break;
     default:
     case 'c':
@@ -264,10 +266,6 @@
         }
     }
     rtc_set_memory(s, 0x39, val);
-
-    /* Disable check of 0x55AA signature on the last two bytes of
-       first sector of disk. XXX: make it the default ? */
-    //    rtc_set_memory(s, 0x38, 1);
 }
 
 void ioport_set_a20(int enable)

qemu-doc.texi

diff --git a/qemu-doc.texi b/qemu-doc.texi
index 23bf680..5a3f8f4 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -228,6 +228,10 @@
 the raw disk image you use is not written back. You can however force
 the write back by pressing @key{C-a s} (@pxref{disk_images}). 
 
+@item -no-fd-bootchk
+Disable boot signature checking for floppy disks in Bochs BIOS. It may
+be needed to boot from old floppy disks.
+
 @item -m megs
 Set virtual RAM size to @var{megs} megabytes. Default is 128 MB.
 

vl.c

diff --git a/vl.c b/vl.c
index 5cbd164..3d80ec8 100644
--- a/vl.c
+++ b/vl.c
@@ -159,6 +159,7 @@
 #define MAX_CPUS 1
 #endif
 int acpi_enabled = 1;
+int fd_bootchk = 1;
 
 /***********************************************************/
 /* x86 ISA bus support */
@@ -4634,6 +4635,9 @@
            "-cdrom file     use 'file' as IDE cdrom image (cdrom is ide1 master)\n"
            "-boot [a|c|d]   boot on floppy (a), hard disk (c) or CD-ROM (d)\n"
 	   "-snapshot       write to temporary files instead of disk image files\n"
+#ifdef TARGET_I386
+           "-no-fd-bootchk  disable boot signature checking for floppy disks\n"
+#endif
            "-m megs         set virtual RAM size to megs MB [default=%d]\n"
            "-smp n          set the number of CPUs to 'n' [default=1]\n"
            "-nographic      disable graphical output and redirect serial I/Os to console\n"
@@ -4765,6 +4769,9 @@
     QEMU_OPTION_cdrom,
     QEMU_OPTION_boot,
     QEMU_OPTION_snapshot,
+#ifdef TARGET_I386
+    QEMU_OPTION_no_fd_bootchk,
+#endif
     QEMU_OPTION_m,
     QEMU_OPTION_nographic,
 #ifdef HAS_AUDIO
@@ -4828,6 +4835,9 @@
     { "cdrom", HAS_ARG, QEMU_OPTION_cdrom },
     { "boot", HAS_ARG, QEMU_OPTION_boot },
     { "snapshot", 0, QEMU_OPTION_snapshot },
+#ifdef TARGET_I386
+    { "no-fd-bootchk", 0, QEMU_OPTION_no_fd_bootchk },
+#endif
     { "m", HAS_ARG, QEMU_OPTION_m },
     { "nographic", 0, QEMU_OPTION_nographic },
     { "k", HAS_ARG, QEMU_OPTION_k },
@@ -5286,6 +5296,11 @@
             case QEMU_OPTION_fdb:
                 fd_filename[1] = optarg;
                 break;
+#ifdef TARGET_I386
+            case QEMU_OPTION_no_fd_bootchk:
+                fd_bootchk = 0;
+                break;
+#endif
             case QEMU_OPTION_no_code_copy:
                 code_copy_enabled = 0;
                 break;

vl.h

diff --git a/vl.h b/vl.h
index ba99d46..d2010f1 100644
--- a/vl.h
+++ b/vl.h
@@ -889,6 +889,7 @@
 /* pc.c */
 extern QEMUMachine pc_machine;
 extern QEMUMachine isapc_machine;
+extern int fd_bootchk;
 
 void ioport_set_a20(int enable);
 int ioport_get_a20(void);