diff --git a/Documentation/arm/tcm.txt b/Documentation/arm/tcm.txt
index 77fd937..7c15871 100644
--- a/Documentation/arm/tcm.txt
+++ b/Documentation/arm/tcm.txt
@@ -19,8 +19,8 @@
 system control coprocessor. Documentation from ARM can be found
 at http://infocenter.arm.com, search for "TCM Status Register"
 to see documents for all CPUs. Reading this register you can
-determine if ITCM (bit 0) and/or DTCM (bit 16) is present in the
-machine.
+determine if ITCM (bits 1-0) and/or DTCM (bit 17-16) is present
+in the machine.
 
 There is further a TCM region register (search for "TCM Region
 Registers" at the ARM site) that can report and modify the location
@@ -35,7 +35,15 @@
 the MMU, but notice that the TCM if often used in situations where
 the MMU is turned off. To avoid confusion the current Linux
 implementation will map the TCM 1 to 1 from physical to virtual
-memory in the location specified by the machine.
+memory in the location specified by the kernel. Currently Linux
+will map ITCM to 0xfffe0000 and on, and DTCM to 0xfffe8000 and
+on, supporting a maximum of 32KiB of ITCM and 32KiB of DTCM.
+
+Newer versions of the region registers also support dividing these
+TCMs in two separate banks, so for example an 8KiB ITCM is divided
+into two 4KiB banks with its own control registers. The idea is to
+be able to lock and hide one of the banks for use by the secure
+world (TrustZone).
 
 TCM is used for a few things:
 
@@ -65,18 +73,18 @@
   memory. Such a heap is great for things like saving
   device state when shutting off device power domains.
 
-A machine that has TCM memory shall select HAVE_TCM in
-arch/arm/Kconfig for itself, and then the
-rest of the functionality will depend on the physical
-location and size of ITCM and DTCM to be defined in
-mach/memory.h for the machine. Code that needs to use
-TCM shall #include <asm/tcm.h> If the TCM is not located
-at the place given in memory.h it will be moved using
-the TCM Region registers.
+A machine that has TCM memory shall select HAVE_TCM from
+arch/arm/Kconfig for itself. Code that needs to use TCM shall
+#include <asm/tcm.h>
 
 Functions to go into itcm can be tagged like this:
 int __tcmfunc foo(int bar);
 
+Since these are marked to become long_calls and you may want
+to have functions called locally inside the TCM without
+wasting space, there is also the __tcmlocalfunc prefix that
+will make the call relative.
+
 Variables to go into dtcm can be tagged like this:
 int __tcmdata foo;