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ath79: add support for Arduino Yun

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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>
This commit is contained in:
Sungbo Eo
2020-01-12 21:36:23 +09:00
committed by Petr Štetiar
parent dc61e3b7ff
commit 358aec7775
7 changed files with 352 additions and 0 deletions
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54
target/linux/ath79/patches-5.4/921-serial-core-add-support-for-boot-console-with-arbitr.patch Normal file
View File

@@ -0,0 +1,54 @@
From 4d3c17975c7814884a721fe693b3adf5c426d759 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Tue, 10 Nov 2015 22:18:39 +0100
Subject: [RFC] serial: core: add support for boot console with arbitrary
baud rates
The Arduino Yun uses a baud rate of 250000 by default. The serial is
going over the Atmel ATmega and is used to connect to this chip.
Without this patch Linux wants to switch the console to 9600 Baud.
With this patch Linux will use the configured baud rate and not a
default one specified in uart_register_driver().
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
[rebased to 4.14, slightly reworded commit message]
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
---
drivers/tty/serial/serial_core.c | 6 +++++-
include/linux/console.h | 1 +
2 files changed, 6 insertions(+), 1 deletions(-)
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -220,6 +220,8 @@ static int uart_port_startup(struct tty_
if (retval == 0) {
if (uart_console(uport) && uport->cons->cflag) {
tty->termios.c_cflag = uport->cons->cflag;
+ tty->termios.c_ospeed = uport->cons->baud;
+ tty->termios.c_ispeed = uport->cons->baud;
uport->cons->cflag = 0;
}
/*
@@ -2104,8 +2106,10 @@ uart_set_options(struct uart_port *port,
* Allow the setting of the UART parameters with a NULL console
* too:
*/
- if (co)
+ if (co) {
co->cflag = termios.c_cflag;
+ co->baud = baud;
+ }
return 0;
}
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -153,6 +153,7 @@ struct console {
short flags;
short index;
int cflag;
+ int baud;
void *data;
struct console *next;
};