malloc: sbrk() should return MORECORE_FAILURE instead of NULL on failure

[karo-tx-uboot.git] / README

diff --git a/README b/README
index 22e35c39bc4deaa553aa3eb226caef51c7ab2da8..bb13bc62a37e3892ade156979fa9f2f69f92dc3b 100644 (file)
--- a/README
+++ b/README
@@ -822,6 +822,16 @@ The following options need to be configured:
 
 - NETWORK Support (other):
 
 
 - NETWORK Support (other):
 

+               CONFIG_DRIVER_AT91EMAC
+               Support for AT91RM9200 EMAC.
+
+                       CONFIG_RMII
+                       Define this to use reduced MII inteface
+
+                       CONFIG_DRIVER_AT91EMAC_QUIET
+                       If this defined, the driver is quiet.
+                       The driver doen't show link status messages.
+

                CONFIG_DRIVER_LAN91C96
                Support for SMSC's LAN91C96 chips.
 
                CONFIG_DRIVER_LAN91C96
                Support for SMSC's LAN91C96 chips.
 


@@ -1123,6 +1133,12 @@ The following options need to be configured:
                images, gzipped BMP images can be displayed via the
                splashscreen support or the bmp command.
 
                images, gzipped BMP images can be displayed via the
                splashscreen support or the bmp command.
 

+- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
+
+               If this option is set, 8-bit RLE compressed BMP images
+               can be displayed via the splashscreen support or the
+               bmp command.
+

 - Compression support:
                CONFIG_BZIP2
 
 - Compression support:
                CONFIG_BZIP2
 


@@ -2447,6 +2463,19 @@ to save the current settings.
        - CONFIG_SYS_EEPROM_SIZE:
          The size in bytes of the EEPROM device.
 
        - CONFIG_SYS_EEPROM_SIZE:
          The size in bytes of the EEPROM device.
 

+       - CONFIG_ENV_EEPROM_IS_ON_I2C
+         define this, if you have I2C and SPI activated, and your
+         EEPROM, which holds the environment, is on the I2C bus.
+
+       - CONFIG_I2C_ENV_EEPROM_BUS
+         if you have an Environment on an EEPROM reached over
+         I2C muxes, you can define here, how to reach this
+         EEPROM. For example:
+
+         #define CONFIG_I2C_ENV_EEPROM_BUS       "pca9547:70:d\0"
+
+         EEPROM which holds the environment, is reached over
+         a pca9547 i2c mux with address 0x70, channel 3.

 
 - CONFIG_ENV_IS_IN_DATAFLASH:
 
 
 - CONFIG_ENV_IS_IN_DATAFLASH:
 


@@ -2982,7 +3011,9 @@ environment. As long as you don't save the environment you are
 working with an in-memory copy. In case the Flash area containing the
 environment is erased by accident, a default environment is provided.
 
 working with an in-memory copy. In case the Flash area containing the
 environment is erased by accident, a default environment is provided.
 

-Some configuration options can be set using Environment Variables:
+Some configuration options can be set using Environment Variables.
+
+List of environment variables (most likely not complete):

 
   baudrate     - see CONFIG_BAUDRATE
 
 
   baudrate     - see CONFIG_BAUDRATE
 


@@ -3094,7 +3125,7 @@ Some configuration options can be set using Environment Variables:
                  available network interfaces.
                  It just stays at the currently selected interface.
 
                  available network interfaces.
                  It just stays at the currently selected interface.
 

-   netretry    - When set to "no" each network operation will
+  netretry     - When set to "no" each network operation will

                  either succeed or fail without retrying.
                  When set to "once" the network operation will
                  fail when all the available network interfaces
                  either succeed or fail without retrying.
                  When set to "once" the network operation will
                  fail when all the available network interfaces


@@ -3110,7 +3141,18 @@ Some configuration options can be set using Environment Variables:
   tftpdstport  - If this is set, the value is used for TFTP's UDP
                  destination port instead of the Well Know Port 69.
 
   tftpdstport  - If this is set, the value is used for TFTP's UDP
                  destination port instead of the Well Know Port 69.
 

-   vlan                - When set to a value < 4095 the traffic over
+  tftpblocksize - Block size to use for TFTP transfers; if not set,
+                 we use the TFTP server's default block size
+
+  tftptimeout  - Retransmission timeout for TFTP packets (in milli-
+                 seconds, minimum value is 1000 = 1 second). Defines
+                 when a packet is considered to be lost so it has to
+                 be retransmitted. The default is 5000 = 5 seconds.
+                 Lowering this value may make downloads succeed
+                 faster in networks with high packet loss rates or
+                 with unreliable TFTP servers.
+
+  vlan         - When set to a value < 4095 the traffic over

                  Ethernet is encapsulated/received over 802.1q
                  VLAN tagged frames.
 
                  Ethernet is encapsulated/received over 802.1q
                  VLAN tagged frames.
 


@@ -3909,7 +3951,9 @@ For PowerPC, the following registers have specific use:
        R30:    GOT pointer
        R31:    frame pointer
 
        R30:    GOT pointer
        R31:    frame pointer
 

-       (U-Boot also uses R14 as internal GOT pointer.)
+       (U-Boot also uses R12 as internal GOT pointer. r12
+       is a volatile register so r12 needs to be reset when
+       going back and forth between asm and C)

 
     ==> U-Boot will use R2 to hold a pointer to the global data
 
 
     ==> U-Boot will use R2 to hold a pointer to the global data