Changeset 94451 in vbox

Timestamp:

Apr 4, 2022 9:33:05 AM (3 years ago)

Author:

vboxsync

Message:

VGABIOS: When restoring state, we have to first set the CRTC base and only then access the CRTC registers, duh!

File:

• trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c (modified) (2 diffs)

trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c

@@ -2379 +2379 @@
         outb(VGAREG_SEQU_DATA, read_byte(ES, BX)); BX++;
 
+        // select crtc base address
+        v = inb(VGAREG_READ_MISC_OUTPUT) & ~0x01;
+        if (crtc_addr == 0x3d4)
+            v |= 0x01;
+        outb(VGAREG_WRITE_MISC_OUTPUT, v);
+
         // Disable CRTC write protection
         outw(crtc_addr,0x0011);
@@ -2389 +2395 @@
             BX++;
         }
-        // select crtc base address
-        v = inb(VGAREG_READ_MISC_OUTPUT) & ~0x01;
-        if (crtc_addr == 0x3d4)
-            v |= 0x01;
-        outb(VGAREG_WRITE_MISC_OUTPUT, v);
-
         // enable write protection if needed
         outb(crtc_addr, 0x11);