diff --git a/m1/patches/rtems/milkymist-audio-add-support-mic-boost.patch b/m1/patches/rtems/milkymist-audio-add-support-mic-boost.patch
index 8cb4846..c503be6 100644
--- a/m1/patches/rtems/milkymist-audio-add-support-mic-boost.patch
+++ b/m1/patches/rtems/milkymist-audio-add-support-mic-boost.patch
@@ -1,8 +1,48 @@
 Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c
 ===================================================================
---- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c	2012-03-20 17:11:20.087160002 +0800
-+++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c	2012-03-20 17:12:23.731160001 +0800
-@@ -372,6 +372,39 @@
+--- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c	2012-03-27 14:03:04.065264002 +0800
++++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c	2012-03-27 19:24:29.329264002 +0800
+@@ -47,6 +47,7 @@
+ static int play_produce;
+ static int play_consume;
+ static int play_level;
++static int mic_boost;
+ 
+ /* buffers played, for application to collect */
+ static rtems_id play_q_done;
+@@ -347,7 +348,7 @@
+ 
+   left = *val & 0xff;
+   left = (left*32)/100 - 1;
+-  if(left < 0)
++  if (left < 0)
+     left = 0;
+ 
+   if (mono)
+@@ -355,7 +356,7 @@
+   else {
+     right = (*val >> 8) & 0xff;
+     right = (right*32)/100 - 1;
+-    if(right < 0)
++    if (right < 0)
+       right = 0;
+   }
+ 
+@@ -365,6 +366,13 @@
+   else
+     codec = (31-left) | ((31-right) << 8);
+ 
++  if (mono) {
++    if (mic_boost)
++      codec |= (1 << 6);
++    else
++      codec &= ~(1 << 6);
++  }
++
+   if (!write_cr(chan, codec))
+     sc = RTEMS_UNSATISFIED;
+   else
+@@ -372,6 +380,41 @@
    return sc;
  }
  
@@ -36,13 +76,15 @@ Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c
 +  if (!write_cr(chan, codec))
 +    return RTEMS_UNSATISFIED;
 +
++  mic_boost = codec;
++
 +  return RTEMS_SUCCESSFUL;
 +}
 +
  rtems_device_driver ac97_control(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
-@@ -419,6 +452,16 @@
+@@ -419,6 +462,16 @@
          if(sc == RTEMS_SUCCESSFUL)
            args->ioctl_return = 0;
          return sc;
@@ -61,8 +103,8 @@ Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/ac97.c
      }
 Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/milkymist_ac97.h
 ===================================================================
---- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_ac97/milkymist_ac97.h	2012-03-20 17:11:23.791160002 +0800
-+++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/milkymist_ac97.h	2012-03-20 17:12:23.731160001 +0800
+--- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_ac97/milkymist_ac97.h	2012-03-27 14:03:04.085264002 +0800
++++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_ac97/milkymist_ac97.h	2012-03-27 14:03:21.753264002 +0800
 @@ -21,6 +21,7 @@
  /* Ioctls. 0x41 is 'A' */
  #define SOUND_MIXER_MIC             0x0