Merge remote-tracking branch 'u-boot-pxa/master' into 'u-boot-arm/master'

[karo-tx-uboot.git] / README

diff --git a/README b/README
index d6006f50180f7df3f16340046e7b5ad39f069601..8f0b38cbf38b16de6f2a9d8707cde096f3b52b51 100644 (file)
--- a/README
+++ b/README
@@ -818,6 +818,22 @@ The following options need to be configured:
                as a convenience, when switching between booting from
                RAM and NFS.
 
+- Bootcount:
+               CONFIG_BOOTCOUNT_LIMIT
+               Implements a mechanism for detecting a repeating reboot
+               cycle, see:
+               http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
+
+               CONFIG_BOOTCOUNT_ENV
+               If no softreset save registers are found on the hardware
+               "bootcount" is stored in the environment. To prevent a
+               saveenv on all reboots, the environment variable
+               "upgrade_available" is used. If "upgrade_available" is
+               0, "bootcount" is always 0, if "upgrade_available" is
+               1 "bootcount" is incremented in the environment.
+               So the Userspace Applikation must set the "upgrade_available"
+               and "bootcount" variable to 0, if a boot was successfully.
+
 - Pre-Boot Commands:
                CONFIG_PREBOOT
 
@@ -1997,6 +2013,21 @@ CBFS (Coreboot Filesystem) support
                kernel). Defining CONFIG_STATUS_LED enables this
                feature in U-Boot.
 
+               Additional options:
+
+               CONFIG_GPIO_LED
+               The status LED can be connected to a GPIO pin.
+               In such cases, the gpio_led driver can be used as a
+               status LED backend implementation. Define CONFIG_GPIO_LED
+               to include the gpio_led driver in the U-Boot binary.
+
+               CONFIG_GPIO_LED_INVERTED_TABLE
+               Some GPIO connected LEDs may have inverted polarity in which
+               case the GPIO high value corresponds to LED off state and
+               GPIO low value corresponds to LED on state.
+               In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
+               with a list of GPIO LEDs that have inverted polarity.
+
 - CAN Support: CONFIG_CAN_DRIVER
 
                Defining CONFIG_CAN_DRIVER enables CAN driver support
@@ -2110,6 +2141,12 @@ CBFS (Coreboot Filesystem) support
                  - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting
                  - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr
 
+               - drivers/i2c/s3c24x0_i2c.c:
+                 - activate this driver with CONFIG_SYS_I2C_S3C24X0
+                 - This driver adds i2c buses (11 for Exynos5250, Exynos5420
+                   9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
+                   with a fix speed from 100000 and the slave addr 0!
+
                additional defines:
 
                CONFIG_SYS_NUM_I2C_BUSES
@@ -4373,6 +4410,9 @@ Low Level (hardware related) configuration options:
 
                NOTE : currently only supported on AM335x platforms.
 
+- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
+               Enables the RTC32K OSC on AM33xx based plattforms
+
 Freescale QE/FMAN Firmware Support:
 -----------------------------------