Replace "CONFIG_OPTIONROMS_CHECKSUM" with "etc/optionroms-checksum" file.
diff --git a/src/Kconfig b/src/Kconfig
index 7a4d50a..3f63374 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -248,17 +248,6 @@
             Select this if option ROMs are already copied to
             0xc0000-0xf0000.  This must only be selected when using
             Bochs or QEMU versions older than 0.12.
-    config OPTIONROMS_CHECKSUM
-        depends on OPTIONROMS
-        bool "Require correct checksum on option ROMs"
-        default y
-        help
-            Option ROMs are required to have correct checksums.
-            However, some option ROMs in the wild don't correctly
-            follow the specifications and have bad checksums.
-            Say N here to allow SeaBIOS to execute them anyways.
-
-            If unsure, say Y.
     config PMM
         depends on OPTIONROMS
         bool "PMM interface"
diff --git a/src/optionroms.c b/src/optionroms.c
index b5a4297..3839497 100644
--- a/src/optionroms.c
+++ b/src/optionroms.c
@@ -116,6 +116,8 @@
     __callrom(MAKE_FLATPTR(seg, 0), ip, 0);
 }
 
+static int EnforceChecksum;
+
 // Verify that an option rom looks valid
 static int
 is_valid_rom(struct rom_header *rom)
@@ -131,7 +133,7 @@
     if (sum != 0) {
         dprintf(1, "Found option rom with bad checksum: loc=%p len=%d sum=%x\n"
                 , rom, len, sum);
-        if (CONFIG_OPTIONROMS_CHECKSUM)
+        if (EnforceChecksum)
             return 0;
     }
     return 1;
@@ -468,6 +470,8 @@
 
     dprintf(1, "Scan for VGA option rom\n");
 
+    EnforceChecksum = romfile_loadint("etc/optionroms-checksum", 1);
+
     if (CONFIG_OPTIONROMS_DEPLOYED) {
         // Option roms are already deployed on the system.
         init_optionrom((void*)BUILD_ROM_START, 0, 1);