diff -r 7e7ede748b3e usr/src/uts/intel/io/acpica/acpica.c
--- a/usr/src/uts/intel/io/acpica/acpica.c	Mon Nov 14 18:42:00 2011 -0500
+++ b/usr/src/uts/intel/io/acpica/acpica.c	Sat Nov 19 14:04:23 2011 -0500
@@ -217,6 +217,13 @@
 		rv = AE_ERROR;
 	}
 
+	if (AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
+	    ACPI_ADR_SPACE_EC,
+	    acpica_ec_handler, NULL, NULL) != AE_OK) {
+		cmn_err(CE_WARN, "!acpica: can't install handler for"
+		    " Embedded Controller");
+		/* XXX: rv = AE_ERROR; ignore, for now */
+	}
 
 	return (rv);
 }
diff -r 7e7ede748b3e usr/src/uts/intel/io/acpica/acpica_ec.c
--- a/usr/src/uts/intel/io/acpica/acpica_ec.c	Mon Nov 14 18:42:00 2011 -0500
+++ b/usr/src/uts/intel/io/acpica/acpica_ec.c	Sat Nov 19 14:04:23 2011 -0500
@@ -111,13 +111,6 @@
 /*
  * ACPI CA address space handler interface functions
  */
-/*ARGSUSED*/
-static ACPI_STATUS
-ec_setup(ACPI_HANDLE reg, UINT32 func, void *context, void **ret)
-{
-
-	return (AE_OK);
-}
 
 /*
  * Only called from ec_handler(), which validates ec_ok
@@ -248,8 +241,8 @@
 	return (rv);
 }
 
-static ACPI_STATUS
-ec_handler(UINT32 func, ACPI_PHYSICAL_ADDRESS addr, UINT32 width,
+ACPI_STATUS
+acpica_ec_handler(UINT32 func, ACPI_PHYSICAL_ADDRESS addr, UINT32 width,
 	    ACPI_INTEGER *val, void *context, void *regcontext)
 {
 	_NOTE(ARGUNUSED(context, regcontext))
@@ -429,6 +422,12 @@
 	}
 
 	/*
+	 * Enable the acpica_ec_handler now that we have:
+	 * ec.ec_sc, ec.ec_base
+	 */
+	ec.ec_ok = 1;
+
+	/*
 	 * Get GPE
 	 */
 	buf.Length = ACPI_ALLOCATE_BUFFER;
@@ -447,28 +446,7 @@
 	}
 
 	/*
-	 * Initialize EC mutex here
-	 */
-	mutex_init(&ec.ec_mutex, NULL, MUTEX_DRIVER, NULL);
-
-	/*
-	 * Assume the EC handler is available now; the next attempt
-	 * to install the address space handler may actually need
-	 * to use the EC handler to install it (chicken/egg)
-	 */
-	ec.ec_ok = 1;
-
-	if (AcpiInstallAddressSpaceHandler(obj,
-	    ACPI_ADR_SPACE_EC, &ec_handler, &ec_setup, NULL) != AE_OK) {
-		cmn_err(CE_WARN, "!acpica: failed to add EC handler\n");
-		ec.ec_ok = 0;	/* EC handler failed to install */
-		membar_producer(); /* force ec_ok store before mutex_destroy */
-		mutex_destroy(&ec.ec_mutex);
-		return (AE_ERROR);
-	}
-
-	/*
-	 * In case the EC handler was successfully installed but no
+	 * In case the EC handler was successfully enabled but no
 	 * GPE was found, return sucess; a warning was emitted above
 	 */
 	if (gpe < 0)
@@ -543,6 +521,11 @@
 void
 acpica_ec_init(void)
 {
+	/*
+	 * Initialize EC mutex here
+	 */
+	mutex_init(&ec.ec_mutex, NULL, MUTEX_DRIVER, NULL);
+
 #ifdef	NOTYET
 	/*
 	 * Search the ACPI tables for an ECDT; if
diff -r 7e7ede748b3e usr/src/uts/intel/sys/acpica.h
--- a/usr/src/uts/intel/sys/acpica.h	Mon Nov 14 18:42:00 2011 -0500
+++ b/usr/src/uts/intel/sys/acpica.h	Sat Nov 19 14:04:23 2011 -0500
@@ -191,6 +191,8 @@
 extern ACPI_STATUS acpica_get_cpu_id_by_object(ACPI_HANDLE, processorid_t *);
 extern ACPI_STATUS acpica_get_apicid_by_object(ACPI_HANDLE, UINT32 *);
 extern ACPI_STATUS acpica_get_procid_by_object(ACPI_HANDLE, UINT32 *);
+extern ACPI_STATUS acpica_ec_handler(UINT32, ACPI_PHYSICAL_ADDRESS, UINT32,
+	ACPI_INTEGER *, void *, void *);
 
 extern uint64_t acpica_get_core_feature(uint64_t);
 extern void acpica_set_core_feature(uint64_t);