diff options
| -rw-r--r-- | include/configs/HWW1U1A.h | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/include/configs/HWW1U1A.h b/include/configs/HWW1U1A.h index 168f70feb9..01597b965b 100644 --- a/include/configs/HWW1U1A.h +++ b/include/configs/HWW1U1A.h @@ -240,7 +240,29 @@ /* Turn off RTC square-wave output to save battery */ #define CONFIG_SYS_RTC_DS1337_NOOSC -/* PCA9554 is at I2C1-0x3f (I know it says "PCA953X", it's a PCA9554) */ +/* + * AT24C128N EEPROM at I2C0-0x53. + * + * That Atmel EEPROM has 128kbit of memory (16kByte) divided into 256 pages + * of 64 bytes per page. The chip uses 2-byte addresses and has a max write + * cycle time of 20ms according to the datasheet. + * + * NOTE: Our environment is stored on regular direct-attached FLASH, this + * chip is only used as a write-protected backup for certain key settings + * such as the serial# and macaddr values. (EG: "env import") + */ +#define CONFIG_CMD_EEPROM +#define CONFIG_ENV_EEPROM_IS_ON_I2C +#define CONFIG_SYS_I2C_EEPROM_ADDR 0x53 +#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2 +#define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS 6 /* 1 << 6 == 64 byte pages */ +#define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 21 + +/* + * PCA9554 is at I2C1-0x3f (I know it says "PCA953X", it's a PCA9554). You + * must first select the I2C1 bus with "i2c dev 1" or the "pca953x" command + * will not be able to access the chip. + */ #define CONFIG_PCA953X #define CONFIG_CMD_PCA953X #define CONFIG_CMD_PCA953X_INFO @@ -449,6 +471,9 @@ const char *hww1u1a_get_ps1(void); "flinitramfs=0xe8800000\0" \ "fldevicetree=0xeff20000\0" \ "flbootm=bootm ${flkernel} ${flinitramfs} ${fldevicetree}\0" \ - "flboot=run preboot; run flbootm\0" + "flboot=run preboot; run flbootm\0" \ + "restore_eeprom=i2c dev 0 && " \ + "eeprom read $loadaddr 0x0000 0x2000 && " \ + "env import -c $loadaddr 0x2000\0" #endif /* __CONFIG_H */ |
