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--- a20 [2016/02/05 12:03]
damien [Bootable microSD]
+++ a20 [2018/05/22 10:33] (current)
@@ Line 1: / Line 1: @@
+====== Getting started with Olimex A20-SOM ======
+Interesting links:
+  * https://www.olimex.com/wiki/A20-SOM
+  * http://fablab-robert-houdin.org/wiki/doku.php?id=tutoriels
+  * http://linux-sunxi.org/Main_Page
+  * https://github.com/linux-sunxi
+===== Buildroot system =====
+Based on https://github.com/mireq/buildroot-a20-olinuxino, using the sunxi u-boot and Linux kernel
+<code>
+make a20_olinuxino_defconfig
+make
+</code>
+===== Bootable microSD =====
+Make two partitions:
+  * boot partition: FAT16, starting at offset 1MB, for u-boot.img, script.bin, uEnv.txt and uImage
+  * linux partion: ext3 for rootfs
+> :!:  Before running below commands be sure of which device is your to-be-formatted microSD card. In this example we take ''/dev/sdc'' . You might loose data if you run the wrong command!
+<code>
+sudo sfdisk /dev/sdc << EOF
+,98304,0xE,*
+,,,-
+EOF
+</code>
+Format the first partition in FAT16 for boot
+<code>
+sudo mkfs.vfat -F 16 /dev/sdc1 -n boot
+</code>
+Format the second in EXT3 for the root filesystem
+<code>
+sudo mkfs.ext3 /dev/sdc2 -L rootfs
+</code>
+Burn ''sunxi-spl.bin'' and ''u-boot.bin'', from //Buildroot//'s ''output/images'', at the beginning of the SD card:
+<code>sudo dd if=sunxi-spl.bin of=/dev/sdc bs=1024 seek=8
+sudo dd if=u-boot.bin of=/dev/sdc bs=1024 seek=32
+</code>
+or, equivalently, ''u-boot-sunxi-with-spl.bin'' (actually, the concatenation of ''sunxi-spl.bin'' and ''u-boot.bin''), to be found in //Buildroot//'s ''build/uboot'':
+<code>
+sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/sdc bs=1024 seek=8
+</code>
+Copy the content of the boot partition:
+<code>
+tar -xvf rootfs.tar -C </path/to/boot/mount/point> --strip=2 --wildcards './boot/*' --exclude './boot/u-boot.bin' --exclude './boot/u-boot.img' --exclude './boot/sunxi-spl.bin' --exclude './boot/u-boot-sunxi-with-spl.bin'
+</code>
+Copy the content of the root filesystem:
+<code>
+sudo tar xvf rootfs.tar -C </path/to/rootfs/mount/point> --exclude 'boot'
+</code>
+===== Display =====
+[[http://www.elecfreaks.com/wiki/index.php?title=2.2S%22_TFT_LCD:_TFT01-2.2S]]
+==== SPI support ====
+  - Add the spi-sun7i driver support to the linux kernel: [[http://will-tm.com/spi-on-the-cubieboard2/]] and [[https://github.com/matzrh/rfm12b-linux/blob/master/spi-sun7i.patch]]
+  - Load the spi driver: ''modprobe spi_sun7i''
+==== FBTFT support ====
+[[https://github.com/notro/fbtft]]
+(requires spi driver to be loaded)
+  - Add the fbtft driver support to Buildroot: [[http://lists.busybox.net/pipermail/buildroot/2015-January/116416.html]]
+  - Load the fbtft_device driver: ''modprobe fbtft_device name=rpi-display  busnum=1 gpios=reset:4,dc:5,led:6 rotate=90''
+     * ''rpi-display'' is associated to the 'ili9341' driver,
+     * ''busnum=1'' refers to device ''/dev/spi1.0'',
+     * ''gpios=...'' makes the link between the defferents signals to the actual gpios they are connected to)
+     * ''rotate=...'' indicates the rotation angle (counter clockwise) of the screen (0, 90, 180 or 270)
+  - Load the driver corresponding to the screen: ''modprobe fb_ili9341''
+=== Backlight ===
+https://github.com/notro/fbtft/wiki/Backlight
+===== Network configuration =====
+==== Ethernet ====
+To enable eth0 interface, load sunxi-emac driver on the OLinuXino-Lime
+<code>
+modprobe sunxi-emac
+</code>
+==== WLAN ====
+=== with a rt2870 chipset ===
+Add the support for the rt2870 chipset to your system:
+  * make sure linux-firmware is ticked in your buildroot configuration
+  * make sure Busybox mdev is configured to support firmware hotload
+On target,
+  * configure mdev as kernel hotplug
+<code>
+sysctl -w kernel.hotplug=/sbin/mdev
+mdev -s
+</code>
+  * load the rt2800usb driver
+<code>
+modprobe rt2800usb
+</code>
+  * bring up the wlan0 interface
+<code>
+ifconfig wlan0 up
+</code>
+=== with a mt7601 chipset ===
+== Build the driver ==
+Download the driver sources from [[https://github.com/porjo/mt7601]]
+Apply the following patch:
+<code>
+diff --git a/src/Makefile b/src/Makefile
+index dfe1283..b2615ab 100755
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -197,11 +197,13 @@ endif
+ ifeq ($(PLATFORM),PC)
+ # Linux 2.6
+-LINUX_SRC = /lib/modules/$(shell uname -r)/build
++LINUX_SRC = <path_to_your_linux_kernel_sources>
+ # Linux 2.4 Change to your local setting
+ #LINUX_SRC = /usr/src/linux-2.4
+-LINUX_SRC_MODULE = /lib/modules/$(shell uname -r)/kernel/drivers/net/wireless/
+-CROSS_COMPILE =
++LINUX_SRC_MODULE = $LINUX_SRC/drivers/net/wireless
++CROSS_COMPILE = <path_to_your_sdk>/host/usr/bin/arm-linux-
++ARCH=arm
++export ARCH
+ endif
+ ifeq ($(PLATFORM),INTELP6)
+diff --git a/src/include/os/rt_linux.h b/src/include/os/rt_linux.h
+index 3726b9e..821e401 100755
+--- a/src/include/os/rt_linux.h
++++ b/src/include/os/rt_linux.h
+@@ -279,7 +279,7 @@ typedef struct file* RTMP_OS_FD;
+ typedef struct _OS_FS_INFO_
+ {
+-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,02,0)
+ 	uid_t				fsuid;
+ 	gid_t				fsgid;
+ #else
+diff --git a/src/include/rtmp_def.h b/src/include/rtmp_def.h
+index 2afcb77..b69af63 100755
+--- a/src/include/rtmp_def.h
++++ b/src/include/rtmp_def.h
+@@ -75,7 +75,7 @@
+ #define RX_RING_SIZE            8
+ #endif /* INF_AMAZON_SE */
+ #define MAX_TX_PROCESS          4
+-#define LOCAL_TXBUF_SIZE        2048
++#define LOCAL_TXBUF_SIZE        256
+ #endif /* RTMP_MAC_USB */
+ #ifdef MULTIPLE_CARD_SUPPORT
+diff --git a/src/os/linux/config.mk b/src/os/linux/config.mk
+index 531b00e..e67c864 100755
+--- a/src/os/linux/config.mk
++++ b/src/os/linux/config.mk
+@@ -1054,7 +1054,7 @@ CFLAGS := -D__KERNEL__ -I$(LINUX_SRC)/include -Wall -O2 -Wundef -Wstrict-prototy
+ export CFLAGS
+ endif
+-GCCVERSION = $(shell gcc -dumpversion)
++GCCVERSION = $(shell $(CROSS_COMPILE)gcc -dumpversion)
+ ifeq ($(PLATFORM),PC)
+     ifneq (,$(findstring 2.4,$(LINUX_SRC)))
+</code>
+where
+  - ''<path_to_your_linux_kernel_sources>'' is the path to the sources of kernel for your target; e.g. ''<buildroot_directory>/output/build/linux-sunxi-v3.4.104-r0''
+  - ''<path_to_your_sdk>'' is your buildroot output directory; e.g. ''<buildroot_directory>/output''
+Note that changing the ''LOCAL_TXBUF_SIZE'' define value from ''2048'' to ''256'' prevents an error to occur during the loading of your driver.
+Launch the compilation:
+<code>
+$ cd src
+$ make
+</code>
+and copy the generated ''src/os.linux/mt7601Usta.ko'' driver to your target.
+Note that the generated file is quite big (15MB)...
+== Load the driver ==
+On your target:
+  * load the driver:
+<code>
+$ insmod mt7601Usta.ko
+</code>
+  * enable the ''ra0'' interface:
+<code>
+$ ifconfig ra0 up
+</code>
+===== PWM =====
+[[https://www.olimex.com/wiki/How_to_add_pwm]]
+===== OpenGL =====
+via the mali driver ([[http://linux-sunxi.org/Mali_binary_driver]])
+To redirect the output the a non standard //framebuffer device//, define the ''FRAMEBUFFER'' environnement variable to the wanted device.
+THe same variable has to be used to launch a Qt5 application, instead of the normal ''QT_QPA_EGLFS_FB'' one.

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