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diff -raNu old/common/cli.c new/common/cli.c
--- old/common/cli.c 2017-05-11 17:59:53.806580961 -0500
+++ new/common/cli.c 2017-05-11 18:06:16.575014377 -0500
@@ -227,6 +227,7 @@
void cli_init(void)
{
+ mts_run_passwd_loop();
#ifdef CONFIG_HUSH_PARSER
u_boot_hush_start();
#endif
diff -raNu old/common/Makefile new/common/Makefile
--- old/common/Makefile 2017-05-11 18:07:26.904563771 -0500
+++ new/common/Makefile 2017-05-11 18:09:05.514736126 -0500
@@ -164,5 +164,6 @@
obj-y += command.o
obj-y += s_record.o
obj-y += xyzModem.o
+obj-$(CONFIG_MTS_PASSWD) += mts_passwd.o
CFLAGS_env_embedded.o := -Wa,--no-warn -DENV_CRC=$(shell tools/envcrc 2>/dev/null)
diff -raNu old/common/mts_passwd.c new/common/mts_passwd.c
--- old/common/mts_passwd.c 1969-12-31 18:00:00.000000000 -0600
+++ new/common/mts_passwd.c 2017-05-12 13:15:54.928180929 -0500
@@ -0,0 +1,248 @@
+#include <common.h>
+#include <linux/ctype.h>
+#include <watchdog.h>
+#include <u-boot/sha256.h>
+#include <mts_passwd.h>
+
+#define MTS_PASSWD_ATTEMPTS (3)
+#define MTS_PASSWD_MAX_LEN (30)
+#define MTS_PASSWD_HASH_VAR "mtsp"
+#define MTS_PASSWD_SALT_VAR "mtss"
+#define MTS_PASSWD_PROMPT "Enter password : "
+
+static
+void mts_do_reset(unsigned long delay)
+{
+ mdelay(delay);
+ do_reset(NULL, 0, 0, NULL);
+}
+
+/*
+ *
+ * Figure out if device is locked or not
+ *
+ */
+static
+int mts_get_protection_status(void)
+{
+ int rc = 0; /* UNLOCKED */
+ char *var = NULL;
+ int len;
+
+ var = getenv(MTS_PASSWD_HASH_VAR);
+
+ do {
+ /* Variable is not set */
+ if (!var) break;
+
+ len = strlen(var);
+
+ /* Variable is empty */
+ if (len == 0) break;
+
+ /*
+ * Length should be correct. Otherwise, do not unlock the device, just show the message and reset.
+ */
+ if (len != 2*SHA256_SUM_LEN) {
+ puts("WARNING: password is corrupted\n");
+ mts_do_reset(1000);
+ }
+
+ /* LOCKED */
+ rc = 1;
+
+ } while (0);
+
+ return rc;
+}
+
+
+/*
+ *
+ * Helper function for the password reading
+ *
+ */
+static
+char *mts_password_delete_char(char *buffer, char *p, int *colp, int *np, int plen)
+{
+ static char erase_seq[] = "\b \b";
+
+ if (*np == 0) {
+ return (p);
+ }
+
+ --p;
+ puts(erase_seq);
+ (*colp)--;
+
+ (*np)--;
+ return (p);
+}
+
+/*
+ *
+ * Read password helper
+ *
+ */
+static
+int mts_password_into_buffer(const char *const prompt, char *buf, size_t buflen)
+{
+ char *p = buf;
+ char *p_buf = p;
+ int n = 0; /* buffer index */
+ int plen = 0; /* prompt length */
+ int col; /* output column cnt */
+ char c;
+
+ /* print prompt */
+ if (prompt) {
+ plen = strlen(prompt);
+ puts (prompt);
+ }
+
+ col = plen;
+
+ for (;;) {
+
+ WATCHDOG_RESET();
+
+ c = getc();
+
+ /*
+ * Special character handling
+ */
+ switch (c) {
+ case '\r': /* Enter */
+ case '\n':
+ *p = '\0';
+ puts("\r\n");
+ return (p - p_buf);
+
+ case '\0': /* nul */
+ case '\t':
+ continue;
+
+ case 0x03: /* ^C - break */
+ p_buf[0] = '\0'; /* discard input */
+ puts("\r\n");
+ return (-1);
+
+ case 0x08: /* ^H - backspace */
+ case 0x7F: /* DEL - backspace */
+ p = mts_password_delete_char(p_buf, p, &col, &n, plen);
+ continue;
+
+ default:
+ /*
+ * Must be a normal character then
+ */
+ if (n < buflen - 2) {
+ ++col; /* echo input */
+ *p++ = c;
+ ++n;
+ }
+ putc('*');
+ }
+ }
+}
+
+/*
+ *
+ * Read the password from input
+ *
+ */
+static
+int read_password(char *buf, size_t buflen)
+{
+ return mts_password_into_buffer(MTS_PASSWD_PROMPT, buf, buflen);
+}
+
+/*
+ *
+ * Verify if the entered password is correct.
+ *
+ */
+static
+int verify_password(char *pwd, size_t pwdlen)
+{
+ char *hash_env = getenv(MTS_PASSWD_HASH_VAR);;
+ char *salt_env = getenv(MTS_PASSWD_SALT_VAR);
+
+ if (pwd && pwdlen > 0 && hash_env && (strlen(hash_env) == 2*SHA256_SUM_LEN)) {
+ uint8_t hash[SHA256_SUM_LEN];
+ uint8_t prefix[]={'0','3','e','3'};
+ sha256_context ctx;
+ char tmp[3];
+ int i;
+
+ sha256_starts(&ctx);
+ sha256_update(&ctx, prefix, 4);
+ sha256_update(&ctx, (uint8_t *) pwd, pwdlen);
+ if (salt_env) {
+ size_t saltlen = strlen(salt_env);
+ sha256_update(&ctx, (uint8_t *) salt_env, saltlen);
+ }
+ sha256_finish(&ctx, hash);
+ memset(&ctx, 0, sizeof(sha256_context));
+
+ for (i = 0; i < SHA256_SUM_LEN; i++) {
+ snprintf(tmp, sizeof tmp, "%02x", hash[i]);
+ if (tolower(tmp[0]) != tolower(hash_env[2*i]) ||
+ tolower(tmp[1]) != tolower(hash_env[2*i + 1])) {
+ break;
+ }
+ }
+
+ if (i == SHA256_SUM_LEN) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ *
+ * Check is the device is locked and ask the password.
+ *
+ */
+void mts_run_passwd_loop(void)
+{
+ char buf[MTS_PASSWD_MAX_LEN] = "\0";
+ unsigned long delay = 1000; /* 1 second initially */
+ int len;
+ int trynr = 0;
+
+ /* Do not delete */
+ printf("", "mts password protected");
+
+ if (mts_get_protection_status() == 0) {
+ return;
+ }
+
+ while (1) {
+ if (trynr == MTS_PASSWD_ATTEMPTS) {
+ mts_do_reset(1000);
+ }
+
+ len = read_password(buf, MTS_PASSWD_MAX_LEN);
+ if (len > 0) {
+ if (verify_password(buf, len)) {
+ /* zero out */
+ memset(buf, 0, sizeof(buf));
+ return;
+ }
+ puts("Permission denied\n");
+ }
+
+ trynr++;
+
+ /* progressive delay */
+ mdelay(delay);
+ delay *= 2;
+ if (delay > 4000) delay = 4000;
+ }
+ /* zero out */
+ memset(buf, 0, sizeof(buf));
+ return;
+}
diff -raNu old/include/common.h new/include/common.h
--- old/include/common.h 2017-05-12 10:49:29.391203966 -0500
+++ new/include/common.h 2017-05-12 10:49:13.170842438 -0500
@@ -25,6 +25,7 @@
#include <asm/ptrace.h>
#include <stdarg.h>
#include <linux/kernel.h>
+#include <mts_passwd.h>
#if defined(CONFIG_PCI) && defined(CONFIG_4xx)
#include <pci.h>
#endif
diff -raNu old/include/mts_passwd.h new/include/mts_passwd.h
--- old/include/mts_passwd.h 1969-12-31 18:00:00.000000000 -0600
+++ new/include/mts_passwd.h 2017-05-12 10:46:40.459437214 -0500
@@ -0,0 +1,13 @@
+#ifndef _MTS_PASSWD_H
+#define _MTS_PASSWD_H
+
+#define CONFIG_MTS_PASSWD
+
+#if defined(CONFIG_MTS_PASSWD)
+#define CONFIG_SHA256
+void mts_run_passwd_loop(void);
+#else
+#define mts_run_passwd_loop() {}
+#endif
+
+#endif
\ No newline at end of file
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