Makefile: Support include files for .dts files

[karo-tx-uboot.git] / README

diff --git a/README b/README
index a248ab5d39fc85438ba4adc6ffd0141a5dffd99c..d0723701c8c511900ecf9e9380fc00a516abeb6b 100644 (file)
--- a/README
+++ b/README
@@ -1000,6 +1000,7 @@ The following options need to be configured:
                CONFIG_CMD_IMLS           List all images found in NOR flash
                CONFIG_CMD_IMLS_NAND    * List all images found in NAND flash
                CONFIG_CMD_IMMAP        * IMMR dump support
+               CONFIG_CMD_IOTRACE      * I/O tracing for debugging
                CONFIG_CMD_IMPORTENV    * import an environment
                CONFIG_CMD_INI          * import data from an ini file into the env
                CONFIG_CMD_IRQ          * irqinfo
@@ -1171,6 +1172,28 @@ The following options need to be configured:
                Note that if the GPIO device uses I2C, then the I2C interface
                must also be configured. See I2C Support, below.
 
+- I/O tracing:
+               When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O
+               accesses and can checksum them or write a list of them out
+               to memory. See the 'iotrace' command for details. This is
+               useful for testing device drivers since it can confirm that
+               the driver behaves the same way before and after a code
+               change. Currently this is supported on sandbox and arm. To
+               add support for your architecture, add '#include <iotrace.h>'
+               to the bottom of arch/<arch>/include/asm/io.h and test.
+
+               Example output from the 'iotrace stats' command is below.
+               Note that if the trace buffer is exhausted, the checksum will
+               still continue to operate.
+
+                       iotrace is enabled
+                       Start:  10000000        (buffer start address)
+                       Size:   00010000        (buffer size)
+                       Offset: 00000120        (current buffer offset)
+                       Output: 10000120        (start + offset)
+                       Count:  00000018        (number of trace records)
+                       CRC32:  9526fb66        (CRC32 of all trace records)
+
 - Timestamp Support:
 
                When CONFIG_TIMESTAMP is selected, the timestamp
@@ -1424,9 +1447,6 @@ The following options need to be configured:
                CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
                txfilltuning field in the EHCI controller on reset.
 
-               CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
-               interval for usb hub power-on delay.(minimum 100msec)
-
 - USB Device:
                Define the below if you wish to use the USB console.
                Once firmware is rebuilt from a serial console issue the