- check in a very broken floppy patch so I can work on it later

2001-12-12 21:35:07 +00:00 · 2001-12-12 21:35:07 +00:00 · e0e9d2183b
parent 12ee9dada7
commit e0e9d2183b
1 changed files with 77 additions and 0 deletions
--- a/bochs/patches/patch.floppy-mt0
+++ b/bochs/patches/patch.floppy-mt0
@ -0,0 +1,77 @@
+----------------------------------------------------------------------
+Patch name: patch.floppy-mt0
+Author: Bryce Denney
+Date: Wed Dec 12 16:34:42 EST 2001
+
+Detailed description:
+WARNING: THIS IS STILL VERY BROKEN!
+I'm working on sourceforge bug
+[ #431508 ] FD io write:3f5: unsupported case 0x45
+http://sourceforge.net/tracker/index.php?func=detail&aid=431508&group_id=12580&atid=112580
+
+The code assumes MT=1, and fails when MT=0.  I need an understanding
+of what MT really does before I can go any further.
+
+Patch was created with:
+  cvs diff -u
+Apply patch to what version:
+  cvs checked out on DATE, release version VER
+Instructions:
+  To patch, go to main bochs directory.
+  Type "patch -p0 < THIS_PATCH_FILE".
+----------------------------------------------------------------------
+
+Index: iodev/floppy.cc
+===================================================================
+RCS file: /cvsroot/bochs/bochs/iodev/floppy.cc,v
+retrieving revision 1.26
+diff -u -r1.26 floppy.cc
+--- iodev/floppy.cc	2001/10/07 03:28:45	1.26
+++ iodev/floppy.cc	2001/12/12 21:31:40
+@@ -466,6 +466,9 @@
+           case 0x4a: /* read ID */
+             BX_FD_THIS s.command_size = 2;
+             break;
+	  case 0x45:
+	    BX_ERROR(("treating FDC command 0x45 just like 0xc5"));
+	    // fall through into next case.
+           case 0xc5: /* write normal data */
+             BX_FD_THIS s.command_size = 9;
+             break;
+@@ -712,7 +715,9 @@
+ 
+     case 0xe6: // read normal data
+ //BX_INFO(("floppy_command read normal data"));
+-    case 0xc5: // write normal data
+    case 0x45: // write normal data, with MT=0.
+      BX_ERROR(("treat FDC command 0x45 like command 0xc5"));
+    case 0xc5: // write normal data, with MT=1.
+ //BX_INFO(("floppy_command write normal data"));
+       if ( (BX_FD_THIS s.DOR & 0x08) == 0 )
+         BX_PANIC(("read/write command with DMA and int disabled"));
+@@ -860,7 +865,7 @@
+         BX_FD_THIS s.pending_command = BX_FD_THIS s.command[0];
+         return;
+         }
+-      else if (BX_FD_THIS s.command[0] == 0xc5) { // write
+      else if (BX_FD_THIS s.command[0] == 0xc5 || BX_FD_THIS s.command[0] == 0x45) { // write
+         BX_FD_THIS s.floppy_buffer_index = 0;
+ 
+         bx_pc_system.set_DRQ(FLOPPY_DMA_CHAN, 1);
+@@ -871,7 +876,7 @@
+         return;
+         }
+       else
+-        BX_PANIC(("floppy_command(): unknown read/write command"));
+        BX_PANIC(("floppy_command(): unknown read/write command 0x%02x", (Bit8u)BX_FD_THIS s.command[0]));
+ 
+       return;
+       break;
+@@ -980,6 +985,7 @@
+ 
+ 
+     case 0x4a: /* read ID */
+    case 0x45:
+     case 0xc5: // write normal data
+     case 0xe6: // read normal data
+       BX_FD_THIS s.pending_command = 0;