README: Drop README.imx31

The only content of this file is CONFIG options which are no-longer present
in U-Boot. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: York Sun <york.sun@nxp.com>

diff --git a/doc/README.imx31 b/doc/README.imx31
deleted file mode 100644 (file)
index 91ef766..0000000
--- a/doc/README.imx31
+++ /dev/null
@@ -1,29 +0,0 @@
-U-Boot for Freescale i.MX31
-
-This file contains information for the port of U-Boot to the Freescale
-i.MX31 SoC.
-
-1. CONFIGURATION OPTIONS/SETTINGS
----------------------------------
-
-1.1 Configuration of MC13783 SPI bus
-------------------------------------
-       The power management companion chip MC13783 is connected to the
-       i.MX31 via an SPI bus. Use the following configuration options
-       to setup the bus and chip select used for a particular board.
-
-       CONFIG_MC13783_SPI_BUS  -- defines the SPI bus the MC13783 is connected to.
-                          Note that 0 is CSPI1, 1 is CSPI2 and 2 is CSPI3.
-       CONFIG_MC13783_SPI_CS   -- define the chip select the MC13783 s connected to.
-
-1.2 Timer precision
--------------------
-       CONFIG_MX31_TIMER_HIGH_PRECISION
-
-       Enable higher precision timer. The low-precision timer
-       (default) provides approximately 4% error, whereas the
-       high-precision timer is about 0.4% accurate. The extra
-       accuracy is achieved at the cost of higher computational
-       overhead, which, in places where time is measured, should
-       not be critical, so, it should be safe to enable this
-       option.