358aec7775
Arduino Yun is a microcontroller development board, based on Atmel
ATmega32u4 and Atheros AR9331.
Specifications:
- MCU: ATmega32U4
- SoC: AR9331
- RAM: DDR2 64MB
- Flash: SPI NOR 16MB
- WiFi:
- 2.4GHz: SoC internal
- Ethernet: 1x 10/100Mbps
- USB: 1x 2.0
- MicroSD: 1x SDHC
Notes:
- Stock firmware is based on OpenWrt AA.
- The SoC UART can be accessed only through the MCU.
YunSerialTerminal is recommended for access to serial console.
- Stock firmware uses non-standard 250000 baudrate by default.
- The MCU can be reprogrammed from the SoC with avrdude linuxgpio.
Installation:
1. Update U-Boot environment variables to adapt to new partition scheme.
> setenv bootcmd "run addboard; run addtty; run addparts; run addrootfs; bootm 0x9f050000 || bootm 0x9fea0000"
> setenv mtdparts "spi0.0:256k(u-boot)ro,64k(u-boot-env),15936k(firmware),64k(nvram),64k(art)ro"
> saveenv
2. Boot into stock firmware normally and perform sysupgrade with
sysupgrade image.
# sysupgrade -n -F /tmp/sysupgrade.bin
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
55 lines
1.6 KiB
Diff
55 lines
1.6 KiB
Diff
From 4d3c17975c7814884a721fe693b3adf5c426d759 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Tue, 10 Nov 2015 22:18:39 +0100
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Subject: [RFC] serial: core: add support for boot console with arbitrary
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baud rates
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The Arduino Yun uses a baud rate of 250000 by default. The serial is
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going over the Atmel ATmega and is used to connect to this chip.
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Without this patch Linux wants to switch the console to 9600 Baud.
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With this patch Linux will use the configured baud rate and not a
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default one specified in uart_register_driver().
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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[rebased to 4.14, slightly reworded commit message]
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Signed-off-by: Sungbo Eo <mans0n@gorani.run>
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---
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drivers/tty/serial/serial_core.c | 6 +++++-
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include/linux/console.h | 1 +
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2 files changed, 6 insertions(+), 1 deletions(-)
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--- a/drivers/tty/serial/serial_core.c
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+++ b/drivers/tty/serial/serial_core.c
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@@ -219,6 +219,8 @@ static int uart_port_startup(struct tty_
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if (retval == 0) {
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if (uart_console(uport) && uport->cons->cflag) {
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tty->termios.c_cflag = uport->cons->cflag;
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+ tty->termios.c_ospeed = uport->cons->baud;
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+ tty->termios.c_ispeed = uport->cons->baud;
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uport->cons->cflag = 0;
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}
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/*
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@@ -2058,8 +2060,10 @@ uart_set_options(struct uart_port *port,
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* Allow the setting of the UART parameters with a NULL console
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* too:
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*/
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- if (co)
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+ if (co) {
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co->cflag = termios.c_cflag;
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+ co->baud = baud;
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+ }
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return 0;
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}
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--- a/include/linux/console.h
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+++ b/include/linux/console.h
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@@ -153,6 +153,7 @@ struct console {
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short flags;
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short index;
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int cflag;
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+ int baud;
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void *data;
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struct console *next;
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};
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