From 47440c32a4c78cfcb47f2346605c62e2eef30d0e Mon Sep 17 00:00:00 2001 From: Theodor Gherzan Date: Thu, 21 Apr 2016 20:42:39 +0100 Subject: [PATCH] README: Document new variable configuration Signed-off-by: Theodor Gherzan Signed-off-by: Andrei Gherzan --- README | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/README b/README index ec9f905..5a6a0d9 100644 --- a/README +++ b/README @@ -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 =============