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README: Document new variable configuration

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Signed-off-by: Theodor Gherzan <theodor@resin.io>
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
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Theodor Gherzan 2016-04-21 20:42:39 +01:00 committed by Andrei Gherzan
parent 3fe96d9212
commit 47440c32a4
1 changed files with 15 additions and 0 deletions
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README
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@ -29,6 +29,7 @@ Contents:
3.L. Enable SPI bus
3.M. Enable I2C
3.N. Enable PiTFT support
3.O. Enable UART support
4. Extra apps
4.A. omxplayer
5. Board Configuration
@ -238,6 +239,20 @@ List of currently supported models:
- pitft22
- pitft28r
3.O. Enable UART
===============
RaspberryPi 1, 2 and CM will have UART console enabled by default.
RaspberryPi 3 does not have the UART enabled by default because this needs a
fixed core frequency and enable_uart wil set it to the minimum. Certain
operations - 60fps h264 decode, high quality deinterlace - which aren't
performed on the ARM may be affected, and we wouldn't want to do that to users
who don't want to use the serial port. Users who want serial console support on
RaspberryPi3 will have to explicitely set in local.conf: ENABLE_UART = "1".
Ref.: https://github.com/raspberrypi/firmware/issues/553
https://github.com/RPi-Distro/repo/issues/22
4. Extra apps
=============