diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index d59e8cf9a..a67a49acf 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,9 @@
+2006-08-27  Joel Sherrill <joel.sherrill@OARcorp.com>
+
+	* libc/sys/rtems/machine/sys/param.h: Conditionalize definition of
+	BLKDEV_IOSIZE and MAXPHYS so it will fit into small memory targets.
+	This is needed to build all AVR and H8300 RTEMS multilib variants.
+
 2006-08-23  Kazunori Asayama  <asayama@sm.sony.co.jp>
 
 	* libc/machine/configure.in: Add configuration for SPU.
diff --git a/newlib/libc/sys/rtems/machine/param.h b/newlib/libc/sys/rtems/machine/param.h
index 4168f1f6c..fd244431d 100644
--- a/newlib/libc/sys/rtems/machine/param.h
+++ b/newlib/libc/sys/rtems/machine/param.h
@@ -34,8 +34,13 @@
 #define DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
 #define DEV_BSIZE	(1<<DEV_BSHIFT)
 
+#if defined(__AVR__) || defined(__h8300__)
+#define BLKDEV_IOSIZE	1024
+#define MAXPHYS		(1 * 1024)	/* max raw I/O transfer size */
+#else
 #define BLKDEV_IOSIZE	2048
 #define MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
+#endif
 
 #define UPAGES	2		/* pages of u-area */