diff --git a/tcl/target/atsamv.cfg b/tcl/target/atsamv.cfg
index d1f8454d5..1d026aa95 100644
--- a/tcl/target/atsamv.cfg
+++ b/tcl/target/atsamv.cfg
@@ -50,3 +50,10 @@ if {![using_hla]} {
 set _FLASHNAME $_CHIPNAME.flash
 flash bank $_FLASHNAME atsamv 0x00400000 0 0 0 $_TARGETNAME
 
+# Set CSW[27], which according to ARM ADI v5 appendix E1.4 maps to AHB signal
+# HPROT[3], which according to AMBA AHB/ASB/APB specification chapter 3.7.3
+# makes the data access cacheable. This allows reading and writing data in the
+# CPU cache from the debugger, which is far more useful than going straight to
+# RAM when operating on typical variables, and is generally no worse when
+# operating on special memory locations.
+$_CHIPNAME.dap apcsw 0x08000000 0x08000000