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README: Drop README.imx31

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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>
This commit is contained in:
Simon Glass 2016-10-02 18:01:09 -06:00 committed by Tom Rini
parent b44b632a68
commit 89e5440ef7
1 changed files with 0 additions and 29 deletions
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doc/README.imx31
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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.