diff --git a/arch b/arch
index 50415398b1..6e6f7947bc 160000
--- a/arch
+++ b/arch
@@ -1 +1 @@
-Subproject commit 50415398b1ae76ffb66df9813f4647dcbfcee234
+Subproject commit 6e6f7947bc11679ec220022b696b8d47badf45f7
diff --git a/fs/fat/Kconfig b/fs/fat/Kconfig
index 9176484f91..d02b3d7304 100644
--- a/fs/fat/Kconfig
+++ b/fs/fat/Kconfig
@@ -83,6 +83,20 @@ config FAT_FORCE_INDIRECT
 		without CONFIG_FAT_DMAMEMORY if there is, for example, only a
 		memory aligment constraints.
 
+			FORCE_   DMA    DIRECT EXAMPLE USAGE
+			INDIRECT MEMORY RETRY
+			  Y        Y      *    Use specially allocated memory;
+			                       Never use caller provided buffer
+			  Y        N      *    Not recommended
+			  N        Y     **    Special memory required; user memory
+			                       has mixed capability; sometimes
+			                       caller memory is not usable
+			  N        N      Y    No special memory but there are
+			                       alignment requirements; return is
+			                       caller buffer is not properly aligned
+			  N        N      N    User memory can always be used for
+			                       transfer.
+
 config FAT_DMAMEMORY
 	bool "DMA memory allocator"
 	default n
@@ -101,6 +115,20 @@ config FAT_DMAMEMORY
 		corresponding function that will be called to free the DMA-capable
 		memory.
 
+			FORCE_   DMA    DIRECT EXAMPLE USAGE
+			INDIRECT MEMORY RETRY
+			  Y        Y      *    Use specially allocated memory;
+			                       Never use caller provided buffer
+			  Y        N      *    Not recommended
+			  N        Y     **    Special memory required; user memory
+			                       has mixed capability; sometimes
+			                       caller memory is not usable
+			  N        N      Y    No special memory but there are
+			                       alignment requirements; return is
+			                       caller buffer is not properly aligned
+			  N        N      N    User memory can always be used for
+			                       transfer.
+
 config FAT_DIRECT_RETRY
 	bool "Direct transfer retry"
 	default y if FAT_DMAMEMORY
@@ -129,4 +157,18 @@ config FAT_DIRECT_RETRY
 		transfer fails with -EFAULT. then the FAT file system will try one
 		more time using the internal sector buffers.
 
+			FORCE_   DMA    DIRECT EXAMPLE USAGE
+			INDIRECT MEMORY RETRY
+			  Y        Y      *    Use specially allocated memory;
+			                       Never use caller provided buffer
+			  Y        N      *    Not recommended
+			  N        Y     **    Special memory required; user memory
+			                       has mixed capability; sometimes
+			                       caller memory is not usable
+			  N        N      Y    No special memory but there are
+			                       alignment requirements; return is
+			                       caller buffer is not properly aligned
+			  N        N      N    User memory can always be used for
+			                       transfer.
+
 endif # FAT