Wiren Board 5: Build an image to download in USB Mass-Storage mode/en: различия между версиями

Версия 19:34, 31 мая 2019

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This manual describes how to build bootstream to boot Linux from USB Mass Storage Gadget. In this case, the contents of the SD-card becomes available via USB as a normal USB flash drive.

The structure of the bootstream:

U-Boot SPL - primary boot loader performs initial initialization
U-Boot - the boot loader itself, runs Linux
The Linux kernel image consists of several parts
- zImage - kernel
- initramfs - file system with modules to support USB gadget, is included in zImage
- DTB - nformation about the periphery required for the kernel to work. Is appended to the end of the zImage, CONFIG_ARM_APPENDED_DTB option should be enabled in the config

Download bootstream

Building Linux

To get the kernel sources from git,

$ git clone https://github.com/contactless/linux.git
$ cd linux
$ git checkout dev/v4.1.15

Download initramfs from repository and unzip

$ unzip initramfs_usbgadget.zip
$ sudo tar xvf initramfs_usbgadget.tar

Initialize the environment to build the kernel. If necessary, change the DT and CROSS_COMPILE variables in this file

$ . ./scripts/kbuild-env.sh
$ set +e

Set the config of the kernel

$ make mxs_usbgadget_defconfig

Build the kernel and modules by installing them in unpacked initramfs

$ INSTALL_MOD_PATH=./initramfs_usbgadget/ ./scripts/kbuild.sh

Build kernel with appended DTB and initramfs

$ ./scripts/kbuild-dtb.sh

Building U-Boot

Get u-Boot sources from git. You need a wb_v2015.07 branch

$ cd ..
$ git clone https://github.com/contactless/u-boot.git
$ cd u-boot
$ git checkout wb_v2015.07

Set u-Boot config

$ make mx28_wirenboard5_usbgadget_defconfig

Copy a previously collected image of [[kernel+initramfs]+DTB] to the U-Boot folder

$ cp ../linux/zImage-imx28-evk ./zImage

Build a combined image [U-Boot+[[kernel+initramfs]+DTB|kernel+initramfs]+DTB] into U-Boot folder

$ cp ../linux/zImage-imx28-evk ./zImage

Build a combined [U-Boot+[[kernel+initramfs]+DTB]] image suitable for booting to USB (bootstream)

$ CROSS_COMPILE='arm-linux-gnueabi-' make -j4 u-boot.sb

Сборка mxsldr

Эта утилита нужна для загрузки полученного образа по USB. Требуется установленная библиотека libusb-1.0 (apt-get install libusb-1.0-0-dev)

$ cd ..
$ git clone http://git.denx.de/mxsldr.git
$ cd mxsldr
$ make

Загрузка собранного образа с помощью mxsldr

$ ./mxsldr ../u-boot/u-boot.sb

@@ Строка 38: / Строка 38: @@
 == Building U-Boot ==
-* Получить исходники U-Boot из git. Нужна ветка ''wb_v2015.07''
+* Get u-Boot sources from git. You need a ''wb_v2015.07'' branch
   <nowiki>
 $ cd ..
@@ Строка 44: / Строка 44: @@
 $ cd u-boot
 $ git checkout wb_v2015.07</nowiki>
-* Задать конфиг U-Boot
+* Set u-Boot config
   <nowiki>$ make mx28_wirenboard5_usbgadget_defconfig</nowiki>
-* Скопировать ранее собранный образ '''[[Special:MyLanguage/kernel+initramfs]+DTB]''' в директорию U-Boot
+* Copy a previously collected image of '''[[kernel+initramfs]+DTB]''' to the U-Boot folder
   $ cp ../linux/zImage-imx28-evk ./zImage
-* Собрать совмещенный образ '''[U-Boot+[[kernel+initramfs]+DTB|kernel+initramfs]+DTB]''' в директорию U-Boot
+* Build a combined image '''[U-Boot+[[kernel+initramfs]+DTB|kernel+initramfs]+DTB]''' into U-Boot folder
   $ cp ../linux/zImage-imx28-evk ./zImage
-* Собрать совмещенный образ '''[U-Boot+[[kernel+initramfs]+DTB]]''', пригодный для загрузки по USB (bootstream)
+* Build a combined '''[U-Boot+[[kernel+initramfs]+DTB]]''' image suitable for booting to USB (bootstream)
   <nowiki>$ CROSS_COMPILE='arm-linux-gnueabi-' make -j4 u-boot.sb</nowiki>

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