diff --git a/kaleid/kernel/sh/testcmds.c b/kaleid/kernel/sh/testcmds.c
index 0973993..9d9895e 100644
--- a/kaleid/kernel/sh/testcmds.c
+++ b/kaleid/kernel/sh/testcmds.c
@@ -113,19 +113,19 @@ error_t CmdDumpATASect(int argc, char **argv, char *cmdline)
 
 error_t CmdDumpMem(int argc, char **argv, char *cmdline)
 {
-    char sector[1024] = {0};
+    char sector[8] = {0};
     char *address = (char*)strtoul(argv[1], NULL, 16);
     int nb = 1; //atoi(argv[2]);
     int x = 0;
-    int step = 16;
+    int step = 8;
 
     KernLog("Address begin: %p\n", address);
 
-    for (int i = 0; i < 1024*nb; i++) {
+    for (int i = 0; i < 8*nb; i++) {
         sector[i] = *address++;
     }
 
-    while(x < 1024*nb) {
+    while(x < 8*nb) {
         KernLog("%C", shcol);
         for (int i = 0; i < step; i++) {
             KernLog("%02x ", (uchar)sector[i+x]);