diff --git a/mt7621/mmio.tcl b/mt7621/mmio.tcl
index 3fdd335..44c73db 100644
--- a/mt7621/mmio.tcl
+++ b/mt7621/mmio.tcl
@@ -3,22 +3,23 @@
 #
 
 proc mmio_read_32 {addr} {
-    set result [read_memory $addr 32 1 phys]
-    return $result
+    set result ""
+    mem2array result 32 $addr 1
+    return $result(0)
 }
 
 proc mmio_clrbits_32 {addr bits} {
-    mww $addr [expr "[mmio_read_32 $addr] & (~($bits))"]
+    mww $addr [expr [mmio_read_32 $addr] & (~($bits))]
 }
 
 proc mmio_setbits_32 {addr bits} {
-    mww $addr [expr "[mmio_read_32 $addr] | $bits"]
+    mww $addr [expr [mmio_read_32 $addr] | $bits]
 }
 
 proc mmio_clrsetbits_32 {addr clr set} {
-    mww $addr [expr "([mmio_read_32 $addr] & (~($clr))) | $set"]
+    mww $addr [expr ([mmio_read_32 $addr] & (~($clr))) | $set]
 }
 
 proc mmio_readfield_32 {addr shift mask} {
-    return [expr "([mmio_read_32 $addr] >> $shift) & $mask"]
+    return [expr ([mmio_read_32 $addr] >> $shift) & $mask]
 }
diff --git a/mt7621/readme.txt b/mt7621/readme.txt
index 5b91fc1..717b65d 100644
--- a/mt7621/readme.txt
+++ b/mt7621/readme.txt
@@ -3,7 +3,7 @@ Steps to load u-boot via JTAG
 == Note ==
 It's suggested to use OpenOCD 0.12.0 or later version.
 
-1. Connect to MT7988 board using mt7621.cfg
+1. Connect to MT7621 board using mt7621.cfg
 
 2. Halt the target
 	> halt
@@ -44,4 +44,4 @@ It's suggested to use OpenOCD 0.12.0 or later version.
    (Only mainline u-boot is supported by this guide)
 
 9. All done
-   Now the u-boot should be running.
\ No newline at end of file
+   Now the u-boot should be running.