diff --git a/pc-bios/README b/pc-bios/README
index e71bcd0f36a2..f4b37d66dcd6 100644
--- a/pc-bios/README
+++ b/pc-bios/README
@@ -17,7 +17,7 @@
 - SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware
   implementation for certain IBM POWER hardware.  The sources are at
   https://github.com/dgibson/SLOF, and the image currently in qemu is
-  built from git tag qemu-slof-20120719.
+  built from git tag qemu-slof-20120731.
 
 - sgabios (the Serial Graphics Adapter option ROM) provides a means for
   legacy x86 software to communicate with an attached serial console as
diff --git a/pc-bios/slof.bin b/pc-bios/slof.bin
index 320b8f001cf9..84ba6b83f3c7 100644
Binary files a/pc-bios/slof.bin and b/pc-bios/slof.bin differ
diff --git a/roms/SLOF b/roms/SLOF
index 7279655af2eb..f21f7a3f46b5 160000
--- a/roms/SLOF
+++ b/roms/SLOF
@@ -1 +1 @@
-Subproject commit 7279655af2eba855bd2df61303d25abd1eeb2300
+Subproject commit f21f7a3f46b557eb5923f899ce8b4401b3cc6d91