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-rw-r--r--board/freescale/common/sys_eeprom.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/board/freescale/common/sys_eeprom.c b/board/freescale/common/sys_eeprom.c
index 3929ad0..43f61f9 100644
--- a/board/freescale/common/sys_eeprom.c
+++ b/board/freescale/common/sys_eeprom.c
@@ -204,7 +204,7 @@ static void update_crc(void)
*/
static int prog_eeprom(void)
{
- int ret = 0; /* shut up gcc */
+ int ret = 0;
int i;
void *p;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
@@ -225,6 +225,11 @@ static int prog_eeprom(void)
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
+ /*
+ * The AT24C02 datasheet says that data can only be written in page
+ * mode, which means 8 bytes at a time, and it takes up to 5ms to
+ * complete a given write.
+ */
for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
p, min((sizeof(e) - i), 8));
@@ -233,12 +238,23 @@ static int prog_eeprom(void)
udelay(5000); /* 5ms write cycle timing */
}
+ if (!ret) {
+ /* Verify the write by reading back the EEPROM and comparing */
+ struct eeprom e2;
+
+ ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
+ CONFIG_SYS_I2C_EEPROM_ADDR_LEN, (void *)&e2, sizeof(e2));
+ if (!ret && memcmp(&e, &e2, sizeof(e)))
+ ret = -1;
+ }
+
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
if (ret) {
printf("Programming failed.\n");
+ has_been_read = 0;
return -1;
}