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commit de3ea4470a6da4c01bfff9377649324747c1e3c9
Author: John Klug <john.klug@multitech.com>
Date: Mon Apr 10 12:16:08 2017 -0500
Add MAC address in default environment and add clearenv functionality.
diff --git a/src/u_boot.c b/src/u_boot.c
index e240475..7eea5e9 100644
--- a/src/u_boot.c
+++ b/src/u_boot.c
@@ -36,6 +36,12 @@
#include "u_boot.h"
+
+#define DUMMY_MAC "00:00:00:00:00:00"
+#define MACNAME "ethaddr"
+
+#define EMPTY_CRC 0xf9137807
+
static int tokcmp(const char *cmd, const char *pattern) {
int len = strlen(cmd);
if (len > strlen(pattern)) {
@@ -64,6 +70,8 @@ static int write_uboot_env(const char *device, struct environment *env)
error("mtd_erase_all %s failed", device);
return -1;
}
+ if(env == NULL)
+ return 0;
fd = open(device, O_WRONLY);
if (fd < 0) {
@@ -166,7 +174,7 @@ static int cmd_setenv(struct environment *env, int argc, char **argv)
var = env->data;
while (*var) {
if (!strncmp(var, name, name_len) && var[name_len] == '=') {
- dbg("found variable (%s) at %lld", var, (long long int) var);
+ dbg("found variable (%s) at %p", var, var);
cp = next_var(var);
while (*cp) {
@@ -213,7 +221,7 @@ static int cmd_setenv(struct environment *env, int argc, char **argv)
}
env->crc = crc32(0, (uint8_t *) env->data, sizeof(env->data));
- dbg("crc: 0x%08X", env->crc);
+ dbg("Calculated crc (to be stored): 0x%08X", env->crc);
env->flags = 0;
tmp = write_uboot_env(MTD_ENV1, env);
@@ -238,7 +246,7 @@ static void print_version(const char *name) {
}
static void usage(FILE *out) {
- fprintf(out, "Usage: u-boot { printenv [ name ] | setenv name [ value ] }\n");
+ fprintf(out, "Usage: u-boot { printenv [ name ] | setenv name [ value ] | clearenv }\n");
fprintf(out, "\n");
}
@@ -252,6 +260,7 @@ int main(int argc, char *argv[]) {
struct environment *env2;
uint32_t crc1_ok;
uint32_t crc2_ok;
+ uint32_t crc1_calc, crc2_calc;
if (argc <= 1) {
usage(stderr);
@@ -301,12 +310,18 @@ int main(int argc, char *argv[]) {
error("read_uboot_env failed");
return 1;
}
- dbg("env1 crc: 0x%08X", env1->crc);
+ dbg("env1 stored crc: 0x%08X", env1->crc);
dbg("env1 flags: %d", env1->flags);
- if (crc32(0, (uint8_t *) env1->data, sizeof(env1->data)) == env1->crc) {
+ crc1_calc = crc32(0, (uint8_t *) env1->data, sizeof(env1->data));
+ if (crc1_calc == env1->crc) {
crc1_ok = 1;
} else {
- error("crc does not match on primary env");
+ dbg("env1 stored crc 0x%x, calculated crc 0x%x",env1->crc,crc1_calc);
+ if ((env1->crc != 0xffffffff) || (crc1_calc != EMPTY_CRC))
+ error("crc does not match on env1");
+ else
+ dbg("uninitialized env1");
+
crc1_ok = 0;
}
@@ -315,20 +330,64 @@ int main(int argc, char *argv[]) {
error("read_uboot_env failed");
return 1;
}
- dbg("env2 crc: 0x%08X", env2->crc);
+ dbg("env2 stored crc: 0x%08X", env2->crc);
dbg("env2 flags: %d", env2->flags);
- if (crc32(0, (uint8_t *) env2->data, sizeof(env2->data)) == env2->crc) {
+ crc2_calc = crc32(0, (uint8_t *) env2->data, sizeof(env2->data));
+ if (crc2_calc == env2->crc) {
crc2_ok = 1;
} else {
- error("crc does not match on redundant env");
+ dbg("env2 stored crc 0x%x, calculated crc 0x%x",env2->crc,crc2_calc);
+ if ((env2->crc != 0xffffffff) || (crc2_calc != EMPTY_CRC) )
+ error("crc does not match on env2");
+ else
+ dbg("uninitialized env2");
crc2_ok = 0;
}
- if (!crc1_ok && !crc2_ok) {
- error("both environments are bad: loading DEFAULT_ENV");
+ if (!crc1_ok && !crc2_ok && (env1->crc == 0xffffffff) &&
+ (env2->crc == 0xffffffff) && (crc1_calc == EMPTY_CRC) &&
+ (crc2_calc == EMPTY_CRC) ) {
+ int mp_fd = open(MAC_PATH, O_RDONLY);
+ int len,retval;
+ char *p;
+
+ fputs("WARNING: Flash is in initial state, so use defaults\n",stderr);
env = env1;
env->flags = 0;
memcpy(env->data, DEFAULT_ENV, sizeof(DEFAULT_ENV));
+ /* Now need to find the MAC address */
+ if (mp_fd == -1) {
+ perror("Cannot open: " MAC_PATH);
+ exit(1);
+ }
+
+ len = sizeof DUMMY_MAC - 1; /* remove null from count */
+ p = malloc(len);
+ retval = read(mp_fd,p,len);
+ dbg("Mac read of %d returned %d",len,retval);
+ if(retval != len) {
+ if(retval == -1) {
+ perror("Failed to read: " MAC_PATH);
+ exit(1);
+ }
+ if (retval != len) {
+ fprintf(stderr,"%s: Only read %d characters of %d for the MAC address\n",
+ MAC_PATH,retval,len);
+ fprintf(stderr,"%s: Read %*.*s\n",MAC_PATH,retval,retval,p);
+ exit(1);
+ }
+ }
+ len = sizeof(DEFAULT_ENV);
+ memcpy(env->data + len - 1, MACNAME, sizeof MACNAME);
+ len += sizeof MACNAME - 1;
+ env->data[len-1] = '=';
+ memcpy(env->data + len, p, sizeof DUMMY_MAC - 1);
+ len += sizeof DUMMY_MAC;
+ env->data[len-1] = 0;
+ env->data[len] = 0;
+ } else if (!crc1_ok && !crc2_ok) {
+ error("both environments are bad: not loading DEFAULT_ENV");
+ exit(1);
} else if (crc1_ok && !crc2_ok) {
env = env1;
} else if (!crc1_ok && crc2_ok) {
@@ -353,6 +412,9 @@ int main(int argc, char *argv[]) {
err = cmd_printenv(env, argc, argv);
} else if (!tokcmp(cmd, "setenv")) {
err = cmd_setenv(env, argc, argv);
+ } else if (!tokcmp(cmd, "clearenv")) {
+ (void)write_uboot_env(MTD_ENV1, NULL);
+ (void)write_uboot_env(MTD_ENV2, NULL);
} else {
usage(stderr);
exit(1);
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