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[contrib] Add patch to enable writable ROM images in bochs

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Some of the gPXE romprefix.S code attempts to write to the ROM image,
as allowed by the PCI spec.  We do gracefully handle the case of
read-only ROM images (for ISA ROMs and for normal bochs/qemu
operation), but it can be handy to be able to use bochs to debug the
code paths that depend on writable ROM images.
This commit is contained in:
Michael Brown 2008-10-21 20:49:10 +01:00
parent d9c38d14d6
commit 22979c511e
1 changed files with 20 additions and 0 deletions
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20
contrib/bochs/bochs-writable-ROM-patch Normal file
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@ -0,0 +1,20 @@
Index: memory/memory.cc
===================================================================
RCS file: /cvsroot/bochs/bochs/memory/memory.cc,v
retrieving revision 1.71
diff -u -r1.71 memory.cc
--- 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: