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authorSungbo Eo <mans0n@gorani.run>2020-01-12 21:36:23 +0900
committerPetr Štetiar <ynezz@true.cz>2020-07-08 23:22:30 +0200
commit358aec77756d6bf850a533272f2685a45220dc0c (patch)
tree6d28b534f25267ab28af866abb92ec92b057f3a9 /target/linux/ath79/patches-4.19
parentdc61e3b7ffdc2e3873af238a9100d44ee685578c (diff)
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ath79: add support for Arduino Yun
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>
Diffstat (limited to 'target/linux/ath79/patches-4.19')
-rw-r--r--target/linux/ath79/patches-4.19/921-serial-core-add-support-for-boot-console-with-arbitr.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-4.19/921-serial-core-add-support-for-boot-console-with-arbitr.patch b/target/linux/ath79/patches-4.19/921-serial-core-add-support-for-boot-console-with-arbitr.patch
new file mode 100644
index 0000000000..f726b05200
--- /dev/null
+++ b/target/linux/ath79/patches-4.19/921-serial-core-add-support-for-boot-console-with-arbitr.patch
@@ -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
+@@ -219,6 +219,8 @@ 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;
+ }
+ /*
+@@ -2058,8 +2060,10 @@ 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;
+ };