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-rw-r--r--src/VBox/Devices/PC/ipxe/contrib/vm/bochs-writable-ROM-patch15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/ipxe/contrib/vm/bochs-writable-ROM-patch b/src/VBox/Devices/PC/ipxe/contrib/vm/bochs-writable-ROM-patch
new file mode 100644
index 00000000..dc586dde
--- /dev/null
+++ b/src/VBox/Devices/PC/ipxe/contrib/vm/bochs-writable-ROM-patch
@@ -0,0 +1,15 @@
+--- memory/memory.cc 18 Oct 2008 18:10:14 -0000 1.71
++++ memory/memory.cc 21 Oct 2008 19:47:07 -0000
+@@ -172,7 +172,11 @@
+ break;
+
+ case 0x0: // Writes to ROM, Inhibit
+- BX_DEBUG(("Write to ROM ignored: address 0x" FMT_PHY_ADDRX ", data %02x", a20addr, *data_ptr));
++ if ((a20addr & 0xfffe0000) == 0x000e0000) {
++ BX_DEBUG(("Write to ROM ignored: address 0x" FMT_PHY_ADDRX ", data %02x", a20addr, *data_ptr));
++ } else {
++ BX_MEM_THIS rom[(a20addr & EXROM_MASK) + BIOSROMSZ] = *data_ptr;
++ }
+ break;
+
+ default: