:: commit f3281459070846add890b4fd8fbc65d6a9a7821c

diff --git a/common/sys/a20.s2.c b/common/sys/a20.s2.c
index 0c55e737..c123bd54 100644
--- a/common/sys/a20.s2.c
+++ b/common/sys/a20.s2.c
@@ -60,6 +60,17 @@ bool a20_enable(void) {
     outb(0x64, 0xae);
     while (inb(0x64) & 2);
 
+    if (a20_check())
+        return true;
+
+    // Fast A20 method
+    b = inb(0x92);
+    if ((b & 0x02) == 0) {
+        b &= ~0x01;
+        b |= 0x02;
+        outb(0x92, b);
+    }
+
     if (a20_check())
         return true;