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| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot-sam460ex/doc/README.imx31 | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot-sam460ex/doc/README.imx31')
| -rw-r--r-- | roms/u-boot-sam460ex/doc/README.imx31 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/roms/u-boot-sam460ex/doc/README.imx31 b/roms/u-boot-sam460ex/doc/README.imx31 new file mode 100644 index 000000000..91ef76688 --- /dev/null +++ b/roms/u-boot-sam460ex/doc/README.imx31 @@ -0,0 +1,29 @@ +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. |