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diff --git a/v86_mem.c b/v86_mem.c
index 4cedbbe..23eb7c0 100644
--- a/v86_mem.c
+++ b/v86_mem.c
@@ -293,7 +293,13 @@ int v86_mem_init(void)
}
vbios_size = tmp[2] * 0x200;
ulog(LOG_DEBUG, "VBIOS at %5x-%5x\n", VBIOS_BASE, VBIOS_BASE + vbios_size - 1);
- mem_vbios = map_file(NULL, vbios_size, PROT_READ,
+
+ /*
+ * The Video BIOS and the System BIOS have to be mapped with PROT_WRITE.
+ * There is at least one case where mapping them without this flag causes
+ * a segfault during the emulation: https://bugs.gentoo.org/show_bug.cgi?id=245254
+ */
+ mem_vbios = map_file(NULL, vbios_size, PROT_READ | PROT_WRITE,
MAP_SHARED, "/dev/mem", VBIOS_BASE);
if (!mem_vbios) {
@@ -303,7 +309,7 @@ int v86_mem_init(void)
}
/* Map the system BIOS */
- mem_sbios = map_file(NULL, SBIOS_SIZE, PROT_READ,
+ mem_sbios = map_file(NULL, SBIOS_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED, "/dev/mem", SBIOS_BASE);
if (!mem_sbios) {
ulog(LOG_ERR, "Failed to mmap the System BIOS as %5x.", SBIOS_BASE);
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